Ralihe R. Villagrán

activity

20232026

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3 papers · 1 filter

math.CO2026

The forbidden structure for zero forcing number

Carlos A. Alfaro, Michael D. Barrus, Sergio Gerardo Gómez-Galicia +5

The {\it zero forcing number} of a graph $G$ , $Z (G)$ , is a well-studied parameter which arises from a color changing process and has strong connections to {\it minimum rank}, {\it…

math.CO2026

The Smith normal form of Laplacian matrices of simplicial annuli and high dimensional trees

Carlos A. Alfaro, Jesús Uriel Medrano, Juan Pablo Serrano +2

Inspired by the generalization of the formula of determinant of the distance matrix of trees to $k$ -trees, we study the Smith normal form of Laplacian matrices associated with some…

math.CO2026

Skirting the $n$ -tuples

Sam Adriaensen, Ferdinand Ihringer, William J. Martin +1

Let $n \geq 2$ and $q \geq 2$ be given. The set $X = Z_{q}^{n}$ is a metric space of diameter $n$ under the Hamming metric $d (\cdot, \cdot)$ . We seek a smallest set $S \subseteq X$ t…

The forbidden structure for zero forcing number

The Smith normal form of Laplacian matrices of simplicial annuli and high dimensional trees

Skirting the n-tuples

Skirting the $n$ -tuples