3 papers
math.GT2020
Pretzel knots up to nine crossings
R. Díaz, P. M. G. Manchón
There are infinitely many pretzel links with the same Alexander polynomial (actually with trivial Alexander polynomial). By contrast, in this note we revisit the Jones polynomial o…
math.AG2019
On toric ind-varieties and pro-affine semigroups
Roberto Díaz, Alvaro Liendo
An ind-variety is an inductive limit of closed embeddings of algebraic varieties and an ind-group is a group object in the category of ind-varieties. These notions were first intro…
math.CO2018
New bounds on the distance Laplacian and distance signless Laplacian spectral radii
Roberto C. Díaz, Ana I. Julio, Oscar Rojo
Let G be a simple undirected connected graph. In this paper, new upper bounds on the distance Laplacian spectral radius of G are obtained. Moreover, new lower and upper bounds for…