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8h
comment What is the most cited mathematical paper?
Shannon's paper kicking off information theory is a good candidate. In general, the applied and engineering side of math seems to cite and get cited a lot more than the pure side.
11h
comment Prove Euler characteristic is a homotopy invariant without using homology theory
@EricWofsey I suppose that if we cheat a little bit, we can give an entirely homotopy theoretic proof that $\pi_n(S^n)=\mathbb Z$ by using the Freudenthal suspension theorem in the next chapter.
2d
comment Prove Euler characteristic is a homotopy invariant without using homology theory
@rj7k8 That seems like a very natural idea -- hopefully it works out eventually!
2d
comment Prove Euler characteristic is a homotopy invariant without using homology theory
@rj7k8 I would love to see your mapping telescope solution.
Aug
28
accepted Volterra-like operator is bounded
Aug
28
awarded  Nice Question
Aug
28
asked Volterra-like operator is bounded
Aug
27
revised Prove Euler characteristic is a homotopy invariant without using homology theory
added 19 characters in body
Aug
27
asked Prove Euler characteristic is a homotopy invariant without using homology theory
Aug
26
accepted Question about maps to $K(G,1)$
Aug
26
revised Question about maps to $K(G,1)$
added 32 characters in body
Aug
25
comment Question about maps to $K(G,1)$
@MikeMiller Great, thanks. If you post that as an answer, I'll accept it and get this off the unanswered queue.
Aug
25
revised Question about maps to $K(G,1)$
added 222 characters in body
Aug
25
asked Question about maps to $K(G,1)$
Aug
25
awarded  Popular Question
Aug
24
awarded  Popular Question
Aug
19
comment Good book about differential forms
@GrumpyParsnip Though it is great, I hesitate to recommend that book to someone without a firm grounding in basic manifold theory. Tu says in the introduction to the book I recommend that he intended it as a prelude to Bott and Tu, to fill in the necessary background.
Aug
19
answered Good book about differential forms
Aug
17
comment $f\mapsto \frac{df}{dx} - \frac{x}{\sqrt{1+x^2}}f $ has closed image and $1$-dimensional cokernel
How would that work?
Aug
17
accepted $f\mapsto \frac{df}{dx} - \frac{x}{\sqrt{1+x^2}}f $ has closed image and $1$-dimensional cokernel