Ernesto Galarza: Mentor and Friend

Presentation to the SJSU CLFSA\u27s 14th Annual Dr. Galarza Scholarship Symposium, September 16, 1998.https://scholarworks.sjsu.edu/josevilla_archive/1000/thumbnail.jp

Rana vibicaria

Number of Pages: 3Integrative BiologyGeological Science

Hydromorphus, H. concolor, H. dunni

Number of Pages: 2Integrative BiologyGeological Science

Rana warszewitschii

Number of Pages: 2Integrative BiologyGeological Science

Leptotyphlops nasalis

Number of Pages: 1Integrative BiologyGeological Science

Lasting Legacy: Local activist Jose Villa was a driver for positive, lasting change

Published for local Metro Silicon Valley newspaper; authored by Gary Singh. August 1-7, 2018. Vol. 34 (21): 12.https://scholarworks.sjsu.edu/josevilla_archive/1001/thumbnail.jp

The genus of the configuration spaces for Artin groups of affine type

Let $(W,S)$ be a Coxeter system, $S$ finite, and let $G_{W}$ be the associated Artin group. One has configuration spaces $Y,\ Y_{W},$ where $G_{W}=\pi_1(Y_{W}),$ and a natural $W$-covering $f_{W}:\ Y\to Y_{W}.$ The Schwarz genus $g(f_{W})$ is a natural topological invariant to consider. In this paper we generalize this result by computing the Schwarz genus for a class of Artin groups, which includes the affine-type Artin groups. Let $K=K(W,S)$ be the simplicial scheme of all subsets $J\subset S$ such that the parabolic group $W_J$ is finite. We introduce the class of groups for which $dim(K)$ equals the homological dimension of $K,$ and we show that $g(f_{W})$ is always the maximum possible for such class of groups. For affine Artin groups, such maximum reduces to the rank of the group. In general, it is given by $dim(X_{W})+1,$ where $X_{ W}\subset Y_{ W}$ is a well-known $CW$-complex which has the same homotopy type as $Y_{ W}.$Comment: To appear in Atti Accad. Naz. Lincei Rend. Lincei Mat. App

Ungaliophis, U. continentalis, U. panamensis

Number of Pages: 4Integrative BiologyGeological Science

Log canonical thresholds of quasi-ordinary hypersurface singularities

The log canonical thresholds of irreducible quasi-ordinary hypersurface singularities are computed, using an explicit list of pole candidates for the motivic zeta function found by the last two authors