(These top files, starting from October 2007, are full-color slideshows.)

**Matroids and statistical dependency**- Discrete Math seminar, Texas State University,
March 2, 2018.
- Slides (full-color slideshow): .pdf
- The corresponding paper has not yet been written.

**Weighted enumeration of spanning trees of complete colorful complexes and skeletons of hypercubes**- Algebra seminar, Texas State University,
March 1, 2018.
- Slides (full-color slideshow): .pdf
- See also "A weighted cellular matrix-tree theorem, with applications to complete colorful and cubical complexes" on my preprint/reprints page

**Matroids and statistical dependency**- CombinaTexas, Texas A&M University,
February 11, 2018.
- Slides (full-color slideshow): .pdf
- The corresponding paper has not yet been written.

**Matroids and statistical dependency**- Joint Mathematics Meeting, San Diego,
January 12, 2018.
- Slides (full-color slideshow): .pdf
- The corresponding paper has not yet been written.

**Bioinformatics-themed projects in Discrete Mathematics**- Joint Mathematics Meeting, San Diego,
January 10, 2018.
- Slides (full-color slideshow): .pdf
- Some of the projects can be found at a recent homework page for Math 2300.

**Matroids and statistical dependency**- AMS Central Sectional Meeting, University of North Texas,
September 9, 2017.
- Slides (full-color slideshow): .pdf
- The corresponding paper has not yet been written.

**A non-partitionable Cohen-Macaulay simplicial complex, and implications for Stanley depth**- Mathematical Congress of the Americas (Special Session on Combinatorial Commutative Algebra), McGill University,
July 28, 2017.
- Slides (full-color slideshow) .pdf
- See also "A non-partitionable Cohen-Macaulay simplicial complex" on my preprint/reprints page

**A non-partitionable Cohen-Macaulay simplicial complex**- Mathematical Congress of the Americas (Special Session on Geometry and Combinatorics of Cell Complexes), McGill University,
July 27, 2017.
- Slides (full-color slideshow) .pdf
- See also "A non-partitionable Cohen-Macaulay simplicial complex" on my preprint/reprints page

**A non-partitionable Cohen-Macaulay simplicial complex**- Departmental Colloquium, New Mexico State University,
March 16, 2017.
- Slides (full-color slideshow): .pdf
- See also "A non-partitionable Cohen-Macaulay simplicial complex" on my preprint/reprints page

**Metric polyhedral complexes**- AMS Central Sectional Meeting, University of St. Thomas,
October 29, 2016.
- Slides (full-color slideshow): .pdf
- The corresponding paper has not yet been written.

**A non-partitionable Cohen-Macaulay simplicial complex**- Discrete Geometry and Algebraic Combinatorics Conference, University of Texas Rio Grande Valley,
May 4, 2016.
- Slides (full-color slideshow): .pdf
- See also "A non-partitionable Cohen-Macaulay simplicial complex" on my preprint/reprints page

**A non-partitionable Cohen-Macaulay simplicial complex**- Discrete Mathematics Seminar, University of Colorado Denver,
March 4, 2016.
- Slides (full-color slideshow): .pdf
- See also "A non-partitionable Cohen-Macaulay simplicial complex" on my preprint/reprints page

**A non-partitionable Cohen-Macaulay simplicial complex, and implications for Stanley depth**- Southwest Local Algebra Meeting [SLAM], Texas State University,
February 28, 2016.
- Slides (full-color slideshow): .pdf
- See also "A non-partitionable Cohen-Macaulay simplicial complex" on my preprint/reprints page

**Weighted tree enumeration of cubical complexes**- Joint Mathematics Meetings, Seattle,
January 9, 2016.
- Slides (full-color slideshow): .pdf
- video!
- See also "A weighted cellular matrix-tree theorem, with applications to complete colorful and cubical complexes" on my preprint/reprints page

**A non-partitionable Cohen-Macaulay simplicial complex**- Departmental Colloquium, University of Texas at El Paso,
April 24, 2015.
- Slides (full-color slideshow): .pdf
- See also "A non-partitionable Cohen-Macaulay simplicial complex" on my preprint/reprints page

**Equivalence relations in mathematics, K-16+**- MAA Southwestern Sectional Meeting, El Paso Community College,
April 19, 2015.
- Slides (full-color slideshow): .pdf

**The surprising similarity of shifted simplicial complexes and matroids**- Stanley@70, MIT,
June 24, 2014.
- Slides (full-color slideshow): .pdf
- See also "A Relative Laplacian Spectral Recursion" on my preprint/reprints page

**Weighted spanning tree enumerators of color-shifted complexes**- CombinaTexas, Texas A&M University,
April 19, 2014.
- Slides (full-color slideshow): .pdf
- The corresponding paper has not yet been written.

**Weighted spanning tree enumerators of color-shifted complexes**- AMS Central Sectional Meeting, Washington University in St. Louis,
October 20, 2013.
- Slides (full-color slideshow): .pdf
- The corresponding paper has not yet been written.

**Equivalence relations in mathematics, K-16+**- AMS Southeastern Sectional Meeting, University of Louisville,
October 5, 2013.
- Slides (full-color slideshow): .pdf

**Weighted spanning tree enumerators of complete colorful complexes**- CombinaTexas, University of Houston-Downtown,
April 21, 2013.
- Slides (full-color slideshow): .pdf
- See also "A weighted cellular matrix-tree theorem, with applications to complete colorful and cubical complexes" on my preprint/reprints page

**Weighted spanning tree enumerators of complete colorful complexes**- 13th Joint UTEP/NMSU Workshop on Mathematics, Computer
Science, and Computational Sciences, New Mexico State University,
April 6, 2013.
- Slides (full-color slideshow): .pdf

**Weighted spanning tree enumerators of complete colorful complexes**- AMS Southeastern Sectional Meeting, University of Mississippi,
March 2, 2013.
- Slides (full-color slideshow): .pdf

**Max flow min cut in higher dimensions**- Joint Mathematics Meetings, San Diego,
January 12, 2013.
- Slides (full-color slideshow): .pdf
- The corresponding paper has not yet been written.

**Max flow min cut in higher dimensions**- 12th Joint UTEP/NMSU Workshop on Mathematics, Computer
Science, and Computational Sciences, University of Texas at El Paso,
October 27, 2012.
- Slides (full-color slideshow): .pdf
- The corresponding paper has not yet been written.

**Cuts and flows in cell complexes**- CombinaTexas, Southwestern University,
April 22, 2012.
- Slides (full-color slideshow): .pdf
- See also "Cuts and flows of cell complexes" on my preprint/reprints page.

**Cuts and flows in cell complexes, I: Topology and vector space bases**- AMS Regional Meeting, University of Kansas,
March 31, 2012.
- Slides (full-color slideshow): .pdf
- See also "Cuts and flows of cell complexes" on my preprint/reprints page.

**Spanning trees and the critical group of simplicial complexes**- Mathematics Colloquium, New Mexico State University,
October 20, 2011.
- Slides (full-color slideshow): .pdf
- See also "Simplicial matrix-tree theorems" and "Critical groups of simplicial complexes" on my preprint/reprints page.

**Critical groups of simplicial complexes**- Formal Power Series and Algebraic Combinatorics,
June 17, 2011.
- Slides (full-color slideshow): .pdf
- See also "Critical groups of simplicial complexes" on my preprint/reprints page.

**Spanning trees and the critical group of simplicial complexes**- Mathematics Seminar, Reed College,
April 28, 2011.
- Slides (full-color slideshow): .pdf
- See also "Simplicial matrix-tree theorems" and "Critical groups of simplicial complexes" on my preprint/reprints page.

**The***G*-Shi arrangement, and its relation to*G*-parking functions- CombinaTexas, Sam Houston State University,
April 16, 2011.
- Slides (full-color slideshow): .pdf
- The corresponding paper has not yet been written.

**The***G*-Shi arrangement, and its relation to*G*-parking functions- 9th Joint UTEP/NMSU Workshop on Mathematics, Computer
Science, and Computational Sciences, New Mexico State University,
April 2, 2011.
- Slides (full-color slideshow): .pdf
- The corresponding paper has not yet been written.

**The Importance of being Equivalent: The Ubiquity of equivalence relations in mathematics, K-16+**- Math Education Seminar, University of Kentucky,
March 31, 2011.
- Slides (full-color slideshow): .pdf

**Spanning trees and the critical group of simplicial complexes**- Discrete CATS Seminar, University of Kentucky,
March 30, 2011.
- Slides (full-color slideshow): .pdf
- See also "Simplicial matrix-tree theorems" and "Critical groups of simplicial complexes" on my preprint/reprints page.

**The***G*-Shi arrangement, and its relation to*G*-parking functions- Joint Mathematics Meetings, New Orleans,
January 8, 2011.
- Slides (full-color slideshow): .pdf
- The corresponding paper has not yet been written.

**The Critical group of a simplicial complex**- AMS Regional Meeting, University of Notre Dame,
November 7, 2010.
- Slides (full-color slideshow): .pdf
- See also "Critical groups of simplicial complexes" on my preprint/reprints page.

**Variations on a***G*-theme: The*G*-Shi arrangement, and its relation to*G*-parking functions- Mathematics Colloquium, Texas A&M University at Galveston,
September 10, 2010.
- Slides (full-color slideshow): .pdf
- The corresponding paper has not yet been written.

**The Critical group of a simplicial complex**- CombinaTexas, Texas State University,
April 24, 2010.
- Slides (full-color slideshow): .pdf
- See also "Critical groups of simplicial complexes" on my preprint/reprints page.

**Combinatorial Laplacians**- Southeast Texas Discrete Math & Applications Workshop, Texas A&M University at Galveston, October 10, 2009.
**Spanning trees and Laplacians of cubical complexes**- CombinaTexas, University of Houston, April 2009.
- Slides (full-color slideshow): .pdf
- See also "Cellular spanning trees and Laplacians of cubical complexes" on my preprint/reprints page

**Simplicial spanning trees**- 4th Joint UTEP/NMSU Workshop on Mathematics, Computer
Science, and Computational Sciences, November 2008.
- Slides (full-color slideshow): .pdf
- See also "Simplicial matrix-tree theorems" on my preprint/reprints page

**Simplicial spanning trees**- Discrete Mathematics & Representation Theory Seminar, University of California at Davis, May 2008.
- Slides (full-color slideshow): .pdf
- See also "Simplicial matrix-tree theorems" on my preprint/reprints page

**A Simplicial matrix-tree theorem, II. Examples**- AMS Regional Meeting, DePaul University, October 2007.
- Slides (full-color slideshow): .pdf
- See also "Simplicial matrix-tree theorems" on my preprint/reprints page

(Note: Every set of "overlays" of these following older talks has been combined into a single slide, and, obviously, hand-drawn colorings and other additions, especially to pictures, are not included.)

**Counting weighted simplicial spanning trees of shifted complexes**- AMS Regional Meeting, Davidson College, March 2007.
**Counting weighted simplicial spanning trees of shifted complexes**- CombinaTexas, Texas A&M University, February 2007.
**Matroid Steiner complexes are Laplacian integral**- AMS Regional Meeting, Bard College, October 2005.
**Eigenvalues of combinatorial Laplacians**- MAA Regional Meeting, University of Texas at El Paso, April 2005.
- Slides: .dvi .ps .pdf
- See also "Shifted Simplicial Complexes are Laplacian Integral" on my preprint/reprints page

**A Relative Laplacian Spectral Recursion**- CombinaTexas, Texas State University, San Marcos, February 2005.
- Slides: .dvi .ps .pdf
- See also "A Relative Laplacian Spectral Recursion" on my preprint/reprints page

**A Relative Laplacian Spectral Recursion**- Richard Stanley 60th Birthday Conference, MIT, June 2004.
- Slides: .dvi .ps .pdf
- See also "A Relative Laplacian Spectral Recursion" on my preprint/reprints page

**Port Complexes and the Laplacian Spectral Recursion**- CombinaTexas, Texas A&M University, April 2004.
**Shifted Simplicial Complexes and Algebraic Shifting**- AMS Regional Meeting, Binghamton University, October 2003.