Archive for January 30th, 2008

Morphisms of Sheaves

We’ve got sheaves now, so naturally we move on to morphisms between them. We begin by fixing X a topological space and take \mathscr{F},\mathscr{G} to be two presheaves on X. A morphism of presheaves is an abelian group homomorphism \phi(U):\mathscr{F}\to\mathscr{G} for each U\subset X open, that satisfies an extra condition. (more…)


2 comments January 30, 2008

About this blog

I'm a grad student in math and I've just finished my first year at the University of Pennsylvania. I started this blog with collaborators who eventually realized that they don't have time, so this is where I'm going to post random cool things I learn, as well as series of posts explaining things when I need to make sure I understand them. The current project is getting me through my orals in the Fall.

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