David Leach, Ph.D.

Professor of Mathematics & Program Coordinator
Department of Computing and Mathematics College of Arts, Culture, and Scientific Inquiry

678-839-4127
cleach@westga.e4dyedu

Technology Learning Center - Room 2223
Office Hours
MWF: 10:45-11:30 AM
MWF: 1:00-1:45 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 2023 Sections

Spring 2023 Sections

Fall 2022 Sections

Spring 2022 Sections

Fall 2021 Sections

Spring 2021 Sections

Fall 2020 Sections

Spring 2020 Sections

  • MATH-2009 (Sophomore Seminar) Section: 01
  • MATH-2644 (Calculus II) Section: 02

Fall 2019 Sections

  • MATH-1113 (Precalculus) Section: 03
  • MATH-2853 (Elementary Linear Algebra) Section: 01
  • MATH-2853 (Elementary Linear Algebra) Section: 02

Spring 2019 Sections

  • MATH-2644 (Calculus II) Section: 03
  • MATH-4473 (Combinatorics) Section: 01
  • MATH-5473 (Combinatorics) Section: 01

Fall 2018 Sections

  • MATH-1634 (Calculus I-Honors) Section: 25H

Spring 2018 Sections

  • MATH-2644 (Calculus II) Section: 03
  • MATH-3003 (Transition to Advanced Math) Section: 01W

Fall 2017 Sections

  • MATH-2644 (Calculus II) Section: 03
  • MATH-3003 (Transition to Advanced Math) Section: 01W

Summer 2017 Sections

  • MATH-1634 (Calculus I) Section: 02

Spring 2017 Sections

  • MATH-2009 (Sophomore Seminar) Section: 01
  • MATH-2644 (Calculus II) Section: 03

Fall 2016 Sections

  • MATH-1634 (Calculus I) Section: L2E
  • MATH-1634 (Calculus I) Section: LXE
  • MATH-1634 (Calculus I) Section: 02
  • MATH-4043 (Number Theory) Section: 01

Fall 2015 Sections

  • MATH-1113 (Precalculus) Section: 10
  • MATH-2853 (Elementary Linear Algebra) Section: 01
  • MATH-2853 (Elementary Linear Algebra) Section: 02

Spring 2015 Sections

  • MATH-2009 (Sophomore Seminar) Section: 01
  • MATH-3003 (Transition to Advanced Math) Section: 01W
  • MATH-4473 (Combinatorics) Section: 01

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