Hi all, I apologize if this should have been posted in a math section instead, I wasn't sure. But I'm wondering if homology or cohomology ever comes up in theoretical physics? I'm being introduced to it at the same time in an algebra class and a manifolds class. There's a commutative/homological algebra class offered next semester, just wondering if it'd be worth it to sit in! If it does come up, exactly in what respect? Thanks!