Publications
 
Slides from (recent) talks
 
 (full-color slideshows)
 
- Enumerating simplicial spanning trees of shifted and color-shifted complexes, using simplicial effective resistance. 
    
 - Algebra seminar, New Mexico State University (online). 
       February 28, 2022.
       
- .pdf
   
  - Enumerating simplicial spanning trees of shifted and color-shifted complexes, using simplicial effective resistance. 
    
 - AMS Central Sectional Meeting, online (formerly University of Creighton),
       October 9, 2021.
       
- .pdf
   
  - Counting topologies of holomorphic polynomial fields with simple zeros
    
 - 31 Semana Nacional de Investigación y Docencia en Matematicás, Universidad de Sonora,
       May 27, 2021.
       
- .pdf
   
  - What is 00, and who decides, and why does it
matter?: The role of definitions in mathematics
    
 - STEMERS (STEM Education Research Seminar), Dept. of Teacher Education, UTEP (online). 
       November 13, 2020.
       
- .pdf
   
  - A non-partitionable Cohen-Macaulay simplicial complex
    
 - 30 Semana Nacional de Investigación y Docencia en Matematicás, Universidad de Sonora,
       March 2, 2020.
       
- .pdf
  
  - All talks, back to 2003.
 
  - A weighted cellular matrix-tree theorem, with applications to complete colorful and cubical complexes
    
 - (w/Ghodratollah Aalipour, Univ. of Colorado Denver,
    Woong Kook, Seoul National University, Kang-Ju Lee, Seoul National University
     and Jeremy Martin, Univ. of Kansas)
    
-  Journal of Combinatorial Theory (Series A) 158 (2018), 362-386.
    
- ScienceDirect link to abstract and .pdf
  
   - The partitionability conjecture
    
 - (w/Caroline (Carly) Klivans, Brown Univ. and Jeremy Martin, Univ. of Kansas)
    
-  Notices of the American Mathematical Society 64 (2017), 117-122.
    
- article in .pdf
  
   - A non-partitionable Cohen-Macaulay simplicial complex
    
 - (w/Bennet Goeckner, Univ. of Kansas, Caroline (Carly) Klivans, Brown Univ. and Jeremy Martin, Univ. of Kansas)
    
-  Advances in Mathematics 299 (2016), 381-395.
    
- ScienceDirect link to abstract and .pdf
  
   - Simplicial and cellular trees
    
 - (w/Caroline (Carly) Klivans, Brown Univ. and Jeremy Martin, Univ. of Kansas)
    
- in "Recent Trends in Combinatorics", IMA Volumes in Mathematics and its Applications 159 (Springer, 2016), pp. 713-752;
    
-  SpringerLink to abstract and article
    
-  preprint arXiv:1506.06819 [math.CO]
    (abstract, link to .pdf) 
  
    - Cuts and flows of cell complexes
    
 - (w/Caroline (Carly) Klivans, Brown Univ. and Jeremy Martin, Univ. of Kansas)
    
-  Journal of Algebraic Combinatorics 41 (2015), 969-999.
    
-  SpringerLink to online abstract and .pdf
  
   - Critical groups of simplicial complexes
    
 - (w/Caroline (Carly) Klivans, Brown Univ. and Jeremy Martin, Univ. of Kansas)
    
-  Annals of Combinatorics 17 (2013), 53-70.
    
-  SpringerLink to abstract and .pdf
  
   - Algorithms to determine the edges of a convex hull from its vertices
    
 - (w/Francisco J. Lopez, Macon State College) 
    
-  International Journal Mathematical Modelling and Numerical Optimisation 3 (2012), 184-209.
    
-  Inderscience link to .pdf
  
   - Cellular spanning trees and Laplacians of cubical complexes
    
 - (w/Caroline (Carly) Klivans, Brown Univ. and Jeremy Martin, Univ. of Kansas)
    
-  Advances in Appplied Mathematics 46 (2011), 247-274.
    
-  ScienceDirect link to pdf.
  
   - Simplicial matrix-tree theorems
    
 - (w/Caroline (Carly) Klivans, Brown Univ. and Jeremy Martin, Univ. of Kansas)
    
- Transactions of the American Mathematical Society 361 (2009), 6073-6114.
    
- abstract, references, .pdf  
  
   - A Relative Laplacian Spectral Recursion
    
 - 
	Electronic Journal of Combinatorics 11(2) (2006) , R26, 19pp. 
    
- abstract, 
        .ps, 
        .pdf, 
  
  - A Common Recursion for Laplacians of
              Matroids and Shifted Simplicial Complexes
    
 - Documenta Mathematica 10 (2005), 583-618.
    
- abstract,
   	.dvi.gz,
   	.dvi,
 	.ps.gz,
 	.pdf.
  
  - Semidirect Product Constructions of Directed Strongly
		Regular Graphs
    
 - (w/Dmitri Iourinski, my former M.S. student)
    
- Journal of Combinatorial Theory (Series A) 104 (2003), 157-167.
    
- abstract,
        full-text.
  
   - Shifted Simplicial Complexes are Laplacian Integral
    
 - (w/Vic 
			Reiner, Univ. of Minnesota)
    
- Transactions of the American Mathematical Society 354 (2002), 4313-4344.
    
- 
        abstract,.tex,.dvi,.ps,.pdf,references
  
   - Algebraic Shifting and Spectral Sequences
    
 - Advanced Studies in Pure Mathematics 33 (2002),
            Computational Commutative Algebra and Combinatorics,
            pp. 53-64.
    
- abstract.
  
  - Iterated Homology and Decompositions of Simplicial
		Complexes 
    
 - (w/Ping
			Zhang, Western Michigan Univ.)
    
- Israel Journal of Mathematics 121 (2001), 313-331.
    
- abstract,
    SpringerLink to .pdf.
  
   - Iterated Homology of Simplicial Complexes
    
 - (w/Lauren Rose, 
	                Bard College),
    
- Journal of  Algebraic Combinatorics 12 (2000), 279-294.
    
- abstract,
    SpringerLink to .pdf.
  
   - Algebraic Shifting Increases Relative Homology,
    
 - Discrete Mathematics 225 (2000), 137-148.
    
-  abstract,
    ScienceDirect link to .pdf.
  
  - Perron-Frobenius Type Results and Discrete Versions of
		Nodal Domain Theorems
    
 - (w/Vic 
			Reiner, Univ. of Minnesota),
    
- Linear Algebra and its Applications 294 (1999), 259-268.
    
- abstract,
    ScienceDirect link to .pdf.
  
   - On f-vectors and Relative Homology, 
    
 - Journal of Algebraic Combinatorics 9 (1999), 215-232.
    
-  abstract,
    SpringerLink to .pdf.
  
  - Free Resolutions of Simplicial Posets,
    
 - Journal of Algebra 188 (1997), 363-399.
    
- abstract,
    ScienceDirect link to .pdf.
  
  - Algebraic Shifting and Sequentially Cohen-Macaulay 
		Simplicial Complexes,
    
 - 
	Electronic Journal of Combinatorics 3 (1996), R21, 14pp. 
    
- 
        abstract,.tex,.dvi,.ps,.pdf
  
  - Covering a Circular String with Substrings of Fixed
		Length  
    
 - (w/ Bill Smyth, McMaster Univ. and Curtin Univ.),
    
- International Journal of 
Foundations of Computer Science 7 (1996), 87-93.
    
-  abstract,
    WorldScientific link to .pdf.
  
   - Orderpotent f-rings 
    
 - (w/Piotr 
		Wojciechowski, UTEP),
    
- Algebra Universalis 34 (1995), 510-526.
    
-  abstract ,
    SpringerLink to .pdf.
  
   - A Combinatorial Decomposition of Simplicial Complexes,
    
 - Israel Journal of Mathematics 87 (1994), 77-87.
    
-  abstract,
    SpringerLink to .pdf.
  
  - A Directed Graph Version of Strongly Regular Graphs,
    
 - Journal of Combinatorial Theory (Series A) 47 (1988), 71-100.
    
-  abstract ,
    ScienceDirect link to .pdf.