2 papers
math.AG2015
Spaces of matrices of constant rank and uniform vector bundles
Philippe Ellia, Paolo Menegatti
Let A be a k-vector space of dimension a. A subvector space M of End(A) is said to be of rank r if every non-zero f in M has rank r. The problem considered in this paper is to dete…
math.NT2014
Ramanujan-Nagell type equations and perfect numbers
Philippe Ellia, Paolo Menegatti
We prove some results on the distance between two perfect numbers using Ramanujan-Nagell type equations.