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 Feb9 awarded Popular Question Dec20 awarded Constituent Dec9 awarded Caucus Nov18 awarded Yearling Sep24 awarded Autobiographer Aug13 accepted Simplifying a generating function in two variables with two binomial coefficients Aug13 comment Simplifying a generating function in two variables with two binomial coefficients @Did not really, I mean that's the position that I started from, since the Chern class of a direct sum is the product of the Chern classes of the summands. I abandoned this question since I didn't get any other answers, but I guess yours is as close as I can get. Jul29 asked Simplifying a generating function in two variables with two binomial coefficients Jul21 comment Relative cohomology of a vector space module non-zero vectors Of course. Thanks! If you want to make that an answer I'll be sure to accept it. Jul21 comment Relative cohomology of a vector space module non-zero vectors Yes, that is actually quite useful. So everything can be computed just using the sequence $H^0(\mathbb R^n,\mathbb R^n_0;\mathbb Z)\to H^0(\mathbb R^n;\mathbb Z)\to H^0(\mathbb R^n_0;\mathbb Z)\to H^1(\mathbb R^n,\mathbb R^n_0;\mathbb Z)\to \cdots$? Jul21 asked Relative cohomology of a vector space module non-zero vectors Jul2 awarded Curious May10 asked What are all the possible sums (and how often do they occur) of a k-subsequence of an n-sequence of integers? Aug31 comment Regional Mathematics Olympiad(RMO-India) Geometry Problem Watch your assertions there, guy. I have zilch idea of what level your competition is at; there are competitions where this type of language is used to mask a simple problem, i.e. one where any specific situation simplifies to the general case. Aug31 comment Regional Mathematics Olympiad(RMO-India) Geometry Problem My bad, I'm not familiar with the RMO-India question setup. Questions posed in this way in competitions I've gone to can be solved in this way. Aug31 answered Regional Mathematics Olympiad(RMO-India) Geometry Problem May27 comment What is the metric tensor on the n-sphere (hypersphere)? Great, thanks for the step-by-step explanation. Although what you've written is fairly clear, you can make it clearer by using the TeX environment, with the $ delimiters, like instead of g'rϕk, write $g'_{r\phi_k}$, which comes out as$g'_{r\phi_k}\$. May27 accepted What is the metric tensor on the n-sphere (hypersphere)? May25 asked What is the metric tensor on the n-sphere (hypersphere)? May11 awarded Tumbleweed