Jeffery Mensah

In this post, we discuss equivalent characterizations of the homotopy extension property of a topological pair $(X, A)$, which states that a homotopy...

In this post, we discuss an invariant of a complex representation of a finite group, and show how this yields a connection between irreducible real and complex representations...

This post builds off of Roger Penrose's article On the Cohomology of Impossible Figures, in which he shows a remarkable connection between impossible drawings, such as the Penrose triangle, and nontrivial cohomology groups...