An Exploration of Emeric Deutsch

Blurred image of Emeric Deutsch

Introduction:

Not everyone in the world is well known even if they have solved the greatest problem, lived a lackluster life, or somewhere in between. There are too many people alive now and people who have lived in the past to have a full collection of information about each and everyone of them. It is common to have great details about certain people but not everyone is as fortunate, or unfortunate, depending on your perspective on the matter. Oftentimes we have information about people who have done extraordinary things or who have risen to stardom. For common people or even people who are on the outskirts of society, it is less likely for someone to bat an eye and ask for more information let alone go on a search for more information. In the realm of science where it is more common for new discoveries to be made there is an additional factor that makes scientists who make new discoveries not reap the same stardom as others in the past. Science, and most fields for that matter, have become so advanced that new discoveries require a significant amount of technical knowledge to understand the significance (Gorvett, 2022). Additionally, some fields have evolved to work in areas that seem to have no real connection to the world we live in. What this means is that simply discovering something new, big or small, does not transport you into stardom and actually could result in you being pushed further into the outskirts. There is nothing wrong with being in stardom, the outskirts, or somewhere in between but from an information standpoint the most information is found on those in stardom. This can come in the form of biographies, interviews, articles, letters, and more but at its core, someone needs to want to create this information and present it.

For me, I hold the common belief that everything is on the Internet. While I do think that is mostly true, I think the clear distinction to be made is that everything that is made is on the Internet. Some things just don't exist and therefore aren’t anywhere. When creating a project on who someone is/was it is important to have information on them or else you are working with nothing. However, how much information do you need to figure out who someone was?

At first glance Emeric Deutsch seems like someone who would have enough information to form some type of story of who he was. This is what I believed when I saw he had 18 manuscript boxes in the Poly Archives. For all I knew there could have been a full biography within one of these boxes. Unfortunately, after closer inspection and use of the Internet I quickly found out the rather obvious fact that not all information is created equal. While, yes, there are 18 boxes full of information, there is a small percentage that can be used to piece together who Emeric Deutsch was. On top of that, not all information has the same accessibility and can take a lot of time and luck to stumble upon the correct information. So now that the foreground has been laid I will ask the simple question: who is Emeric Deutsch?

The most detailed and complete piece of information about Emeric was found in his PhD Thesis.

Extract of Emeric Deutsch’s thesis Vectorial and matricial norms (Deutsch, 1969)

This brief biographical account of Emeric’s life up until 1969 was the most direct and clear account of Emeric’s life that I have been able to find. It includes his place of birth, birthday, education, and some brief work experience. While great to learn more about his roots and early life it does leave the remaining 54 years a mystery. A mystery is not an understatement. Despite spending hours searching for more information it was not easy and the enthusiasm felt when finding something new can not be expressed in words. The information that I have gathered has been compiled in the remaining sections in effort to piece together who Emeric Deutsch was.

Emeric Deutsch’s Work:

By all accounts, Emeric Deutsch was a mathematician through and through with his first publication being from 1960 and last publication being from 2023 with 89 total publications according to MathSciNet (2025). His work has traversed different fields with the top three classifications of his published work being combinatorics, linear and multilinear algebra; matrix theory, and mechanics of solids. Overall, he is listed to have 901 citations in 691 publications. The discrepancy in numbers is from having multiple works cited in one publication of which he himself is responsible for having done. All this information is from MathSciNet but when using other databases like Academia.edu or dblp.org the total publications and citations vary significantly. A rather obvious answer to this is that these places are not searching for every paper published and connecting them back to the authors. MathSciNet has been labeled as the most reliable source in the field of mathematics but the validity and credibility of MathSciNet in terms of storing Emeric’s work can be verified by a piece found in the archives listing his work with date ranges from 1998-2001 (Mathematical Reviews, 2019).

Emeric Deutsch’s publications 1998-2001 (Creator Unknown, 2001)

It is unclear who created this document and what its purpose was but by comparing the titles of the papers to those listed on MathSciNet each one is present and there is no discrepancy between the two. The rest of this document contains his list of referees listing 11 papers and 4 invitations to symposiums/conferences with a similar date range as the publications. An interesting aspect of the dblp.org website is the showing of the 16 questions asked by Emeric in the American Mathematical Monthly. Dblp was the only website that mentioned these problems and took record of them (dblp, 2025). The American Mathematical Monthly has a problems section which allows mathematicians to pose new questions they have found and Emeric’s posting of questions is a clear indication of his passion for mathematics.

Emeric’s most cited paper is Dyck path enumeration from 1998 in which, no surprise, he covers enumeration of Dyck paths using both existing and new formulas. Since this exploration is not a math research paper I won’t bore the non-interested with the fine details but will give a brief background on this work and some flavors from the rest of his work. This paper falls under the larger classification of combinatorics which is primarily focused on “combinations and arrangements of discrete structures” (Morris, 2023). Enumeration is basically counting and a common application is in calculating all possible inputs that result in the same output. To be slightly more specific to Emeric’s work, his work in Dyck path enumeration involves deriving ways to calculate the number of possible configurations of certain paths based on certain parameters. A Dyck path is a type of lattice path that consists of rises and falls that exists solely in the positive x and y coordinate system.

Figure of a Dyck path from Emeric’s most cited paper Dyck path enumeration (Deutsch, 1999)

Emeric has multiple publications involving Dyck paths and even has a type of path, Deutsch path, named after him for his proposal of a certain path. His enumeration techniques can be applied to other path types which were a significant source of citations. The enumeration of lattice paths has applications in many different fields of mathematics as well as in computer science and chemistry. This is primarily due to the ability to express other problems in lattice paths and therefore those problems can be studied using different lattice path counting models. For example, polymer chains can be modeled in a lattice path and using enumeration methods, the entropy, stability, chain length, and more can be calculated (Feng et al., 2023). Since the field is relatively popular and has so many different avenues to explore it takes a significant breakthrough to make a big impact. Emeric’s paper did gain the attention of some, even being selected to be in a special volume of Discrete Mathematics, Editors’ Choice.

Notification of selection of paper in Editors’ Choice Edition (Hammer, 1999)

Emeric’s early work before his time at Polytechnic Institute of Brooklyn (Poly) involved mechanics of solids in which he worked on mathematical theories to model elasticity. Some other work that was interesting was with mathematical chemistry and developing equations to calculate indices and vertices of different chemical structures. He was involved in the development of the M-polynomial which is a way to encode information about graphs into one equation. These equations can calculate indices of different compounds and be used to predict the properties of the compound and any family of the compound (Deutsch, 2015).

Looking more into who is citing Emeric the most cited paper that cites Emeric is “Nineteen dubious ways to compute the exponential of a matrix, twenty-five years later” in which Emeric’s paper “On matrix norms and logarithmic norm” is cited (Moler and Van Loan, 2003). This paper is cited 440 times which does have some logical reasoning behind it since it is an overview paper which tends to gain more citations overall (American Mathematical Monthly, 2025). The next highest cited paper cites Emeric’s paper Dyck Path Enumeration furthering the idea that this work was significant in the field. As you scroll down the list of top cited papers, Emeric himself and co-authors are among his other top cited papers. It does not seem Emeric had the furthest reach in terms of his papers but that does not mean his work was worthless. Helmut Prodinger took one of Emeric’s ideas about an extension of a Dyck path and honored Emeric by naming the path after him in 2020.

Front page of Helmut’s paper Deutsch paths and their enumeration (Prodinger, 2020)

Helmut then went on to publish four more papers all acknowledging Emeric. Helmut and Emeric contributed to a paper in 2003 and the original problem was proposed by Emeric in 1999 in an American Mathematical Monthly problem section. It is interesting to see the big time gap between the two events. The brief documented correspondence between Helmut and Emeric is documented in the communications section. The important aspect is that this extension on paths and the new findings are slightly trivial. The overall significance and impact is minimal but still a demonstration of Emeric’s impact.

While I mentioned citations and looked at the most cited work it needs to be taken with a grain of salt. Since mathematics has many different branches and each mathematician seeks different things it is hard to generalize based on numbers such as citations and publications of their quality of work or impact. Some mathematicians will only go after the most prized unsolved problems resulting in very few publications while others will go for trivial problems that result in shorter, more frequent publications. Additionally, as was hinted at earlier, the validity of various websites that record citations counts and papers published by individuals can have missing or incorrect information. In fact, it seems that the supposed most reliable source, MathSciNet, missed a key paper by Emeric. While conducting more research on Emeric I wanted to explore other areas of his work and was interested in M-polynomials and noticed that his first paper on the matter, M-polynomial and degree-based topological indices, did not appear on MathSciNet. I traced back to the first paper by going through the citations on his later papers on M-polynomials that are on MathSciNet. Based on arXiv, a popular preprint server, and the Iranian Journal of Mathematical Chemistry the paper has 421 citations making it the most cited paper by Emeric (2014d, 2015). This paper was also in his archives along with email correspondence with the co-author, Sandi, mentioning it. The archives contain emails going over his initial pitching of the idea and the progress of the idea but most notably the rejection of the paper by MATCH for being “below usual mathematical standards” (Deutsch, 2014c).  The paper was published on arXiv in 2014 and then in the Iranian Journal of Mathematical Chemistry in 2015.

  Email from Sandi notifying Emeric of the rejection from MATCH (Klavzar, 2014)

There is mention between Emeric and Sandi about the simplicity of the work but also the larger impacts and significance and even more contradicting is the rejection of the paper but high citation count. Again, it is very hard to determine the impact of Emeric’s work being an outsider of the field and qualitative metrics can be incorrect or missing critical data.

One area that gives a more clear understanding on one's quality of work is peer opinions. On top of Emeric’s research, he was also involved in peer reviews in which he was praised highly for work.

Communication with Gaston Nguerekata mentioning Emeric’s quality of work (Nguerekata, 2001)

Communication with Herb Wilf mentioning Emeric’s quality of work (Wilf, 1999)

Excerpt from a communication mentioning Emeric’s quality of work (Rogers, 1998)

Emeric seemed to go above and beyond in the reviews demonstrating both his passion for the subject and expertise in the field. There are mentions of him doing a “wonderful job” and being “unusually thorough” which coming from other peers in the field does highlight his work effort (Nguerekata, 2001; Wilf, 1999) . Emeric continued reviewing and publishing for the rest of his life despite retirement from Poly which will be covered more later. At times Emeric turned down reviewing, mentioning the amount of time needed to dig into the topic and already being busy with another reviewing job as reasons for rejecting the offer (Deutsch, 2014b). The importance of quality over quantity is something honorable and supports his overall career in which he did show an emphasis on quality but more importantly a passion for mathematics.  

Communications:

Hidden within the research articles, derivations, proofs, and sketches in Emeric’s archival collection is his correspondence with various different people. Most of these people have at least one publication with Emeric but none of them seem to have direct ties with Poly. Extending this further, Emeric’s top 16 co-authors based on number of papers together and most cited work are all outside of Poly.

Map with Emeric (Red) and colleagues (Blue)

It has been found that the higher quality mathematical publications are related to collaboration outside departments which can be used to support the reason behind Emeric working with other mathematicians outside of Poly (Dubois et al., 2010). It is unclear how Emeric met his colleagues but just because there was geographical distance between Emeric and his collaborators, it did not stop the transfer of ideas. Within the archives are Emeric’s printed emails and faxes where he discusses ideas, progress on papers, and general life updates. More interesting are that his emails are printed out and annotated by pencil/pen at times. Some emails are printed twice and in some cases in two different formats such as a plain text file and screenshot. Since everyone is different and there was nothing from him mentioning why he did this it is hard to give an explanation and generalization is rather unhelpful. There is mention of Emeric getting help from the management of the building he lives in with sending email attachments in 2021 (Deutsch, 2021). However, since there were also printed emails from the early 2000s it is hard to conclude that it was for technological support or age reasons. Additionally, technology did not seem to be an issue with Emeric using emojis at times.

Emeric using an Emoji in an email (Deutsch, 2020)

I will acknowledge that the archives has multiple folders containing correspondence and some correspondences were found in other folders that were mostly hand sketches so there are definitely gaps with my research. The most significant pieces that I did find are highlighted in the following section.

Correspondence to Sandi in 2019 showing new networks with hand sketches (Deutsch, 2019)

Fax of equations to Sandi by Emeric in 2014 (Deutsch, 2014a)

Proof written over email to Sergi in 2011 (Deutsch, 2011)

Emeric sent both new ideas and complete work to his colleagues in various different forms. In some cases Emeric hand wrote the content and then faxed it to the receiver while other times he wrote it fully in plain text on email. There are also instances of traditional letters with notes being sent back and forth in 2022. There are full email chains between Emeric and others discussing problems they are encountering when working on different questions and asking and receiving help from each other. It is clear that Emeric formed real connections between his colleagues and was not working in isolation. Additionally, Emeric continued to work with others and on mathematics until the very end. As seen through this email to Sandi in 2022 he mentions his old age of almost 93 years old directly followed by his recent findings of new M-polynomials.

Email between Sandi and Emeric discussing M-polynomials (Deutsch, 2022)

Another aspect seen through the above email is Emeric’s personability mentioning badminton which was a common mention between Sandi and Emeric. However, there was never a full communication about badminton over the email and in some cases it did not even get mentioned in the response. It seems that this was phatic communication meaning it is done to maintain personal bonds compared to sharing information (Zuckerman, 2020). While the overall content of most of the emails and communications were professional, the tone was usually very friendly and casual. It is clear that both individuals respected each other highly and appreciated each other. However, the more personal aspects seemed more phatic and it does not seem that Emeric was openly sharing his life details with his colleagues. In some cases it seems that Emeric prefers privacy and mentions being very busy with “non-professional items” without further explanation.

Mentioning of non-professional items in Email to Sergi (Deutsch, 2018)

From this and the lack of other large references to his life outside of the professional setting it can be inferred that Emeric was a very private person which is rather easy to support based on the overall information available.

One of the areas that I did want to look into was Emeric’s connection with Helmut, who named the path after Emeric. Within the archives is a folder of correspondence with Helmut but as expected the communication is very professional and mainly focused on the writing of papers. My biggest remaining question is why it took around 20 years from the initial idea to the paper? As mentioned earlier, Emeric proposed the problem in 1999 and the Deutsch paths were published in 2020. Furthermore, Helmut and Emeric published together in 2003 so did have some existing connection at least from that point onwards. One thing I did find within the correspondence was the mention of a new path that Emeric proposed be named “Prodinger paths”.

Emeric mentioning a Prodinger paths to Helmut (Deutsch, 2021)

I found this significant since Helmut named the Deutsch paths after Emeric so as a reciprocating gesture Emeric proposed a new path to be named Prodinger. It shows a level of generosity and respect.

Connection to Poly and life after “retirement”:

The remaining piece of Emeric that is to be explored is his ties to Poly. Referring back to his thesis, he came to Poly in 1964 and by his author affiliation on his papers he remained at Poly the rest of his life. However, it does not appear to be as straightforward as that. While this could be due to the various mergers that occurred between Poly and NYU as a whole and Poly/Tandon math department and Courant it is still a surprise to find no apparent connection without significant digging. As mentioned previously, I have a slight bias towards the Internet so I started by looking at the faculty lists for Poly and NYU hoping to find Emeric’s name at least somewhere since he was still using the affiliation. By using the Wayback Machine and a lot of searching I found a “‘development’ stage WEB page” that had Emeric listed as a retired professor in 1998.

Web archive of Polytechnic University Department of Math and Physics faculty list in July 1998 (Faculty List, 1998)

This was the only source that I could find with Emeric being listed on the online faculty list raising some questions of why. To supplement my findings I looked into the Poly catalogs from 1981 until present day and found more interesting pieces of information.

Faculty List from 1981-83 Catalog of Polytechnic Institute of New York (Course Catalog, 1981)

Faculty List from 1993-95 Catalog of Polytechnic University (Course Catalog, 1993)

Faculty List from 1999-2001 Catalog of Polytechnic University (Course Catalog, 1999)

Faculty List from 2001-2003 Catalog of Polytechnic University (Course Catalog, 2001)

From looking at the faculty lists in the previous catalogs it appears that Emeric was a Professor of Mathematics until 1997 where he retired and became Emeritus but then became an Adjunct Professor in 2001. After 2001 Emeric disappeared again from the faculty and emeritus/retired list. It is unclear whether his emeritus status was reinstated and what the final outcome of the situation was. Since I was unable to see his title from 1964-1981 I will assume he followed the normal path beginning with instructor during his masters degree into assistant and associate professor before being a professor. In academia titles are usually related with research output and impact and climbing the ladder requires meeting different requirements set forth by the university (University Council, 2021). It seems that Emeric was able to meet all requirements and even getting the prestigious honor of Emeritus which is given to recognize lifetime contributions by a professor. His final title of adjunct professor points towards temporary employment so there is not a lot of surprise when he goes back into supposed retirement but it is unusual his emeritus status seems to not be maintained. His amount of publications was relatively constant and actually had some of his most impactful works published after his retirement so it does not seem that his professor status was revoked for not meeting requirements. As can be seen through his work, the supposed retirement from being a professor did not seem to stop him from pursuing mathematics. In Changeover from Professor to Professor Emerita: Challenges and Opportunities, Doris G. Duncan mentions that retirement can add a new spark to research and does not mean the complete end of a life in academia. It seems that Emeric still had that passion for mathematics that he once had and fully enjoyed what he was working on whether he was a professor or just an independent researcher. Despite the lack of connection to Poly after 2001 on paper, he still continued the use of the university affiliation but even more interesting was he had publications under both Polytechnic Institute of New York University and NYU Tandon after the name change to NYU Tandon.

2021 Paper with NYU Tandon Affiliation (Elizalde, 2021)

2018 Paper with Polytechnic Institute of New York University Affiliation (Deutsch, 2019)

In a 2018 and 2023 paper he uses the Polytechnic Institute of New York University affiliation which is after the name change to NYU Tandon but also has other papers with similar dates using the NYU Tandon affiliation (Deutsch, 2019, 2023; Elizalde, 2021). While this is a very small error it does point towards a larger disconnect between Emeric and the university since the affiliation can be important. Author affiliation is mentioned to have a positive effect on mathematicians so it is possible that Emeric/co-authors continued to use the affiliation to increase credibility compared to for actual university affiliation (Dubois et al., 2010). An additional point can be made about the email Emeric used which was not affiliated to the university. In earlier email communications in the 1990s, he used a duke.poly.edu or magnus.poly.edu domain but then used msn.com from around 2000s onward but my searching of emails was not as extensive as it could have been. Yet again it is hard to come to a conclusion on his affiliation with Poly after 2001 given the available information but sometimes a conclusion does not have to be drawn. The main part to be highlighted is his work was enough to attain Emeritus and his personal feelings toward Poly were strong enough to continue the affiliation despite the lack of affiliation on paper.

Conclusion:

The exploration of Emeric Deutsch has been a rollercoaster with a lot of interesting rabbit holes and dead ends. The search for information was always exciting and whether I thought the information was easy to find or didn’t exist I almost always surprised myself with what I found. By changing my searches and adding keywords I found completely new information that completely escaped my previous research. The Deutsch paths were one of the last things I found which seems counterintuitive given it is named after him. Additionally, the original M-polynomial paper was found even after the Deutsch paths. It still feels like there is more out there but actually finding that information could take a lifetime. As mentioned and demonstrated throughout this piece, the amount of prepackaged and well presented information on Emeric is slim. Extending this further, the amount of prepackaged and well presented information on most people is slim. Personally, I take for granted the usefulness of the work done by others in collecting and curating information about people whether that be a Wikipedia page or a research paper. It is hard to create something out of just fragments and even harder when those fragments were not created in the first place. What was pointed at earlier was Emeric’s privacy and it seems as though the lack of information was intentional. Not everyone wants to share their life and write down everything about themselves. While there is an aspect of too many people and too much information, the larger piece is that on an individual level there is little significance placed on documenting one's life to then be shared. One of the most impactful and potentially easiest ways to learn about someone or something is through oral history. Oral history is a way to preserve and generate information through first hand accounts and especially helpful in filling in the gaps within other primary sources (Diehm and Covert, 2023). This exploration of Emeric could have been streamlined by asking those around him but piecing together a puzzle with no reference image is sometimes more interesting. In the end, the metaphorical puzzle of who Emeric was is still missing some key pieces but with the help of Yvonne Deutsch, Emeric’s daughter and donor of the collection to the Poly Archives, a real image of Emeric can be completed. This was the only image found in the archives but did not have any further information. Without the support of Yvonne, the identity could not have be found highlighting the importance of asking others for information. Through the completion of this project Emeric’s life has a few more stepping stones that the next person can build off of.

Picture of Emeric (Right) with Colleagues (Creator Unknown, Date Unknown)

Acknowledgements and Gaps

        This work is by no means complete or to be taken as 100% accurate. In all work there are gaps and analysis is not always truthful. One of the major points to mention is that a lot of the analysis drawn from the communication is based on what Emeric saved which could have only been specific work related things. It is possible that Emeric had more casual conversations with his colleagues but did not save them. His more personal life would need to be explored using different methods. Further, I did not go through every paper in every box in the archival collection so more information could be present within the archives. From the boxes I was able to go through I found sufficient information to create this but a full account of who Emeric was would require looking through the other boxes for new pieces that could add to my work or completely disprove it. Additionally, I am no mathematician and analysis about impact and specifics could be incorrect. Research is by no means linear and there is always room for improvement.

References:

Primary Sources:

Catalog 1981-1983 - Polytechnic Institute of New York. Previous & PDF Bulletins. (1981).

http://bulletin.engineering.nyu.edu/mime/media/13/703/Catalog+1981-1983.pdf

Catalog 1993-1995 - Polytechnic University. Previous & PDF Bulletins. (1993).

http://bulletin.engineering.nyu.edu/mime/media/15/697/Catalog+1993-1995.pdf

Catalog 1999-2001 - Polytechnic University. Previous & PDF Bulletins. (1999).

http://bulletin.engineering.nyu.edu/mime/media/15/696/Catalog+1999-2001.pdf

Catalog 2001-2003 - Polytechnic University. Previous & PDF Bulletins. (2001).

http://bulletin.engineering.nyu.edu/mime/media/15/695/Catalog+2001-2003.pdf

Creator Unknown. (2001). [List of publications].  Emeric Deutsch Collection, Poly Archives (Box 7, Folder 2), Bern Dibner Library, NYU Libraries, Brooklyn, NY.

Creator Unknown. (Date Unknown). [Picture of Emeric and Colleagues].  Emeric Deutsch Collection, Poly Archives (Box 22, Folder 1), Bern Dibner Library, NYU Libraries, Brooklyn, NY.

Deutsch, E. (1969). Vectorial and Matricial Norms /. ProQuest Dissertations & Theses,

https://www.proquest.com/docview/2823307894?sourcetype=Dissertations%20&%20Tes

es

Deutsch, E. (1999). Dyck path enumeration. Discrete Mathematics., 204(1–3), 167–202.

https://doi.org/10.1016/S0012-365X(98)00371-9

Deutsch, E. (2011, March 5). [Proof written on email to Sergi].  Emeric Deutsch Collection, Poly

Archives (Box 16, Folder 10), Bern Dibner Library, NYU Libraries, Brooklyn, NY.

Deutsch, E. (2014a, April 11). [Fax of equations to Sandi].  Emeric Deutsch Collection, Poly

Archives (Box 7, Folder 10), Bern Dibner Library, NYU Libraries, Brooklyn, NY.

Deutsch, E. (2014b, April 17). [“RE: asking for your opinion” email to Sandi].  Emeric Deutsch Collection, Poly Archives (Box 16, Folder 13), Bern Dibner Library, NYU Libraries, Brooklyn, NY.

Deutsch, E. (2014c, July). [Printed publication of M-polynomial and degree based topological indices].  Emeric Deutsch Collection, Poly Archives (Box 16, Folder 13), Bern Dibner Library, NYU Libraries, Brooklyn, NY.

Deutsch, E., & Klavžar, S. (2014d, July 7). M-polynomial and degree-based topological indices. arXiv.org. https://arxiv.org/abs/1407.1592

Deutsch, E. and Klavžar, S. (2015). M-polynomial and Degree-based Topological Indices. Iranian Journal of Mathematical Chemistry, 6(2), 93-102. doi: 10.22052/ijmc.2015.10106

Deutsch, E. (2018, December 23). [“Non-professional items” email to Sergi].  Emeric Deutsch

Collection, Poly Archives (Box 16, Folder 10), Bern Dibner Library, NYU Libraries,

Brooklyn, NY.

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Deutsch Collection, Poly Archives (Box 7, Folder 5), Bern Dibner Library, NYU

Libraries, Brooklyn, NY.

Deutsch, E., & Klavžar, S. (2019). M-polynomial revisited: Bethe cacti and an extension of

Gutman’s approach. Journal of Applied Mathematics & Computing., 60(1–2), 253–264.

https://doi.org/10.1007/s12190-018-1212-x

Deutsch, E. (2020, March 4). [M-polynomial email to Sandi with Emoji].  Emeric Deutsch Collection, Poly Archives (Box 16, Folder 12), Bern Dibner Library, NYU Libraries, Brooklyn, NY.

Deutsch, E. (2021, May 19). [Mentioning Prodinger paths to Helmut in “a nice conjecture” email].  Emeric Deutsch Collection, Poly Archives (Box 16, Folder 14), Bern Dibner Library, NYU Libraries, Brooklyn, NY.

Deutsch, E. (2021, May 24). [Mentioning of building management helping send email].  Emeric Deutsch Collection, Poly Archives (Box 16, Folder 14), Bern Dibner Library, NYU Libraries, Brooklyn, NY.

Deutsch, E. (2022, April 6). [M-polynomial email to Sandi].  Emeric Deutsch Collection, Poly

Archives (Box 16, Folder 10), Bern Dibner Library, NYU Libraries, Brooklyn, NY.

Deutsch, E., Klavžar, S., & Romih, G. D. (2023). How to compute the M-polynomial of (chemical) graphs. MATCH Communications in Mathematical and in Computer Chemistry, 89(2), 275–285. https://match.pmf.kg.ac.rs/electronic_versions/Match89/n2/match89n2_275-285.pdf

Elizalde, S., & Deutsch, E. (2021). The degree of asymmetry of sequences. Enumerative

Combinatorics and Applications, 2(1), Article #S2R7-7.

https://doi.org/10.54550/eca2022v2s1r7

Faculty List. Polytechnic University - Faculty (Applied Mathematics and Physics). (1998, December 5). https://web.archive.org/web/19981205045308/http://math.poly.edu/faculty.html

Hammer, P. (2000, October 25). [Letter of Selection for Editors’ Choice Edition 1999].  Emeric

Deutsch Collection, Poly Archives (Box 16, Folder 8), Bern Dibner Library, NYU

Libraries, Brooklyn, NY.

Klavzar, S. (2014, July 21). [Email from Sandi notifying Emeric of the rejection from MATCH].  Emeric Deutsch Collection, Poly Archives (Box 16, Folder 13), Bern Dibner Library, NYU Libraries, Brooklyn, NY.

Nguerekata, G. (2001, April 26). [Nguerekata Email Correspondence Thanking Emeric].  Emeric

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Libraries, Brooklyn, NY.

Prodinger, H. (2020, April 14). Deutsch paths and their enumeration. arXiv.org.

https://arxiv.org/abs/2003.01918

Rogers, D. (1998, March 5). [Email Correspondence Mentioning Emeric].  Emeric

Deutsch Collection, Poly Archives (Box 16, Folder 8), Bern Dibner Library, NYU

Libraries, Brooklyn, NY.

Wilf, H. (1999, September 26). [Wilf Email Correspondence Thanking Emeric].  Emeric

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Libraries, Brooklyn, NY.

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https://mathscinet.ams.org/mathscinet/author?authorId=301243

dblp team. (2025). Emeric Deutsch. dblp. https://dblp.org/pid/25/4984.html

Diehm, N., & Covert, R. (2023, October 31). The importance of oral history. St Augustine Historical Society. https://staughs.com/the-importance-of-oral-history/

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good mathematician?. Toulouse School of Economics. https://www.researchgate.net/profile/Pierre-Dubois/publication/46452503_What_Does_It_Take_to_Become_a_Good_Mathematician/links/0912f50f5163150b40000000/What-Does-It-Take-to-Become-a-Good-Mathematician.pdf

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Opportunities. ISCAP. https://iscap.us/proceedings/2020/pdf/5341.pdf

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