David Leach, Ph.D.

Professor of Mathematics & Program Coordinator
School of Computing, Analytics, and Modeling Dr. Perry College of Mathematics, Computing, and Sciences

678-839-4127
cleach@wrZRH1BUVnz6G7csgEd5dUrdgFGYZ0RiXwBtJBNGqKAQgJGPestga.edu

Technology Learning Center - Room 2223
Office Hours
MWF: 11:00 AM - 12:00 PM

Also available immediately after class or by appointment.

Download curriculum vitae for David Leach, Ph.D. in PDF
David Leach, Ph.D.
  • BS, Mathematics with Computer Science, Auburn University Montgomery, 1997
  • M.S., Mathematics, Auburn University, 1999
  • Ph.D., Mathematics, Auburn University, 2002

Fall 2025 Sections

Spring 2025 Sections

Fall 2024 Sections

Spring 2024 Sections

Fall 2023 Sections

Spring 2023 Sections

Fall 2022 Sections

Spring 2022 Sections

Fall 2021 Sections

Spring 2021 Sections

Fall 2020 Sections

Abdollah Khodkar and David Leach, "Magic Rectangles with Empty Cells", Utilitas Mathematica, to appear

MR4156399 Khodkar, Abdollah ; Leach, David ; Ellis, Brandi . Signed magic rectangles with three filled cells in each column. Bull. Inst. Combin. Appl. 90 (2020), 87--106.

MR4243165 Khodkar, Abdollah ; Leach, David . Magic rectangles with empty cells. Util. Math. 116 (2020), 45--56.

MR3626286 Leach, C. David . Chasing the lights in Lights Out. Math. Mag. 90 (2017), no. 2, 126--133.

MR3519061 Leach, C. David . Proof without words: powers of three and triangular numbers. College Math. J. 47 (2016), no. 2, 120.

MR3263572 Leach, David . Modular Leech trees of order at most 8. Int. J. Comb. 2014, Art. ID 218086, 2 pp.

MR2848065 Leach, David ; Walsh, Matthew . Generalized Leech trees. J. Combin. Math. Combin. Comput. 78 (2011), 15--22.

MR2542677 Khodkar, Abdollah ; Leach, David . The chromatic number of K2(9,4) is 11. J. Combin. Math. Combin. Comput. 70 (2009), 217--220.

MR2568853 Abueida, Atif ; Clark, Sally ; Leach, David . Multidecomposition of the complete graph into graph pairs of order 4 with various leaves. Ars Combin. 93 (2009), 403--407.

MR2337056 Leach, David ; Walsh, Matt . A characterization of lattice-ordered graphs. Combinatorial number theory, 327--332, de Gruyter, Berlin, 2007.

MR2337546 Khodkar, Abdollah ; Leach, David ; Robinson, David . Every (2,r)-regular graph is regular. Util. Math. 73 (2007), 169--172.

MR2351184 Ashe, D. J. ; Leach, David ; Rodger, C. A. 2-regular leaves of partial 8-cycle systems. Australas. J. Combin. 39 (2007), 3--17.

MR2351193 Culver, Clay ; Leach, David . Equivalence classes of 5-bit Gray codes. Australas. J. Combin. 39 (2007), 129--134.

MR2196652 Khodkar, Abdollah ; Leach, David . On (2,r)-regular graphs. Bull. Inst. Combin. Appl. 46 (2006), 27--34.

MR2113718 Bryant, Darryn ; Leach, C. D. ; Rodger, C. A. Hamilton decompositions of complete bipartite graphs with a 3-factor leave. Australas. J. Combin. 31 (2005), 331--336.

MR2059999 Leach, C. D. ; Rodger, C. A. Hamilton decompositions of complete graphs with a 3-factor leave.In honour of Zhu Lie. Discrete Math. 279 (2004), no. 1-3, 337--344.

MR2012803 Leach, C. D. ; Rodger, C. A. Hamilton decompositions of complete multipartite graphs with any 2-factor leave. J. Graph Theory 44 (2003), no. 3, 208--214.

MR1905911 Leach, C. D. ; Rodger, C. A. Fair Hamilton decompositions of complete multipartite graphs. J. Combin. Theory Ser. B 85 (2002), no. 2, 290--296.

Non-disconnecting Disentanglements of Amalgamated 2-factorizations of Complete Multipartite Graphs