16 Answers votes newest views recent 0Best online mathematics videos? (2) 14Why is a topology made up of ‘open’ sets? 48Most helpful math resources on the web 3How should one present curl and divergence in an undergraduate multivariable calculus class? 1Interesting applications of the Pigeon-hole Principle 10Resources for learning practical category theory 14Computer Science for Mathematicians 4book for probability 5Books about history of recent mathematics 8Gossip about Grothendieck and distributive lattices 10Are there any mathematical objects that exist but have no concrete examples? 0What is some good introduction to lambda calculus? 0Decent Texts on Categorical Logic 1Background to learn about manifolds 0Propositional logic with categories 3How much of the current logic is about syntax?