Tag: Lefschetz

Here is an other “poem” that has been added to the “math poetry page”. Given a simplical complex G, it computes the automorphism group Aut (its group of symmetries, meaning invertible simplicial mapss) and for each T computes both the Lefschetz number and the sum of the indices of the …

During a nice 23 K run on Friday, I was thinking a bit about Lefschetz. This is one of the first stories, I tackled. See the paper. It is one of my 10 favorite theorem in graph theory. I originally formulated it in graph theory in 2012 generalizing the one …