David J. Hemmer

Welcome

David J. Hemmer is Professor of Mathematical Sciences at Michigan Technological University (Michigan Tech/MTU). My research is primarily in representation theory, particularly the representation theory of symmetric and algebraic groups, and in algebraic combinatorics.

I am a faculty member in the Department of Mathematical Sciences at Michigan Tech . You can also visit my official Michigan Tech faculty profile .

Research

Recent Preprints

• Specht Modules With Trivial Direct Summands

  Hemmer, D. J. Submitted, 2026. arXiv:2608.13661

• New columns in decomposition matrices of symmetric groups for every block

  Hemmer, D. J., Turek, P. Submitted, 2026. arXiv:2606.28731

• Divisible Arm Lengths, Crystal Reflections, and Enumeration of Newly Found Decomposition Columns

  Hemmer, D. J., Turek, P. Submitted, 2026. arXiv:2606.28305

• Optimal Play, Nontransitivity, and Nash Equilibria in Dice Bingo

  Hemmer, D. J., Ong, B. W. Submitted, 2026. arXiv:2606.20744

  Play Dice Bingo

Recent Publications

• Equal knapsack identities between symmetric group character degrees

  Hemmer, D. J., Straub, A., Westrem, K. J., to appear Journal of Algebra, 2026. arXiv:2510.00301

• New identities in the character table of symmetric groups involving Riordan numbers

  Hemmer, D. J., Straub, A., Westrem, K. J. The Electronic Journal of Combinatorics 33(1) (2026), P1.57.

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• Partition-theoretic model of prime distribution

  Botkin, A., Dawsey, M. L., Hemmer, D. J., Just, M. R., Schneider, R. Journal of Number Theory (2026), https://doi.org/10.1016/j.jnt.2025.12.008

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• Partitions with Fixed Points in the Sequence of First-Column Hook Lengths

  Cuthbertson, P., Hemmer, D. J., Hopkins, B., Keith, W. J. Annals of Combinatorics 30 (2026), 35–47.

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• Generating functions for fixed points of the Mullineux map

  Hemmer, D. J. European Journal of Combinatorics 127 (2025) 104141.

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• Palindrome partitions and the Calkin–Wilf tree

  Hemmer, D. J., Westrem, K. J. The Ramanujan Journal 65 (2024), 1073–1085.

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Teaching

Fall 2026

• MA 3210: Introduction to Combinatorics
• MA 5980: Combinatorial Representation Theory

Spring 2027

• MA 4208: Optimization and Graph Algorithms

Outreach

I run the Copper Country Math Circle at Michigan Technological University.

Copper Country Math Circle

Contact

David J. Hemmer
Professor of Mathematical Sciences
Michigan Technological University

Email: djhemmer@mtu.edu

Office: Fisher Hall 315

Phone: 906-487-2905

View My Curriculum Vitae