Here to learn a few things and let the mind wander.
30 If a continuous function is positive on the rationals, is it positive almost everywhere? sep 17 '11
22 Are there uncountably many non homeomorphic ways to topologize a countably infinite set? apr 24 '11
17 Why the whole exterior algebra? mar 10
16 CSB inquality: is $\|x\|^2\|y\|^2 - \langle x,y \rangle^2$ a square in any obvious way? mar 25 '13
16 Why is the inclusion of the tensor product of the duals into the dual of the tensor product not an isomorphism? apr 5 '11
16 Who has the upper hand in a generalized game of Risk? nov 26 '11