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 Oct 29 revised Proving a sum using induction adding in + signs Oct 29 suggested approved edit on Proving a sum using induction Oct 29 accepted Closure w.r.t $|| . ||_\infty$ Oct 29 accepted Showing closure in the $\|\cdot\|_1$ norm Oct 29 accepted The real numbers and the axiom of foundation Oct 29 asked $f$ mapping open sets to open sets Oct 26 awarded Yearling Oct 24 revised Prove $\sum_{i=0}^{n}\left(x_{i}^{n}\prod_{0\leq k\leq n}^{k\neq i}\frac{x-x_k}{x_i-x_k}\right)=x^n$ Formatting Latex better Oct 24 suggested approved edit on Prove $\sum_{i=0}^{n}\left(x_{i}^{n}\prod_{0\leq k\leq n}^{k\neq i}\frac{x-x_k}{x_i-x_k}\right)=x^n$ Oct 24 accepted Subspace topologies and unions Oct 24 comment Finding the min of an integral Are you missing a $\sqrt{}$ at the end? Oct 24 comment Finding the min of an integral Thanks very much, I have put in the details of the solution above- is that fine? Oct 24 revised Finding the min of an integral Filling in my answer Oct 23 accepted Finding the min of an integral Oct 23 comment Finding the min of an integral @Alex yeah thanks sorry Oct 23 revised Finding the min of an integral added 4 characters in body Oct 23 asked Finding the min of an integral Oct 23 answered How can I Prove that $[(p \to\neg q) \wedge q] \to \neg p$ is a tautology? Oct 23 revised How can I Prove that $[(p \to\neg q) \wedge q] \to \neg p$ is a tautology? missing or sign Oct 23 suggested approved edit on How can I Prove that $[(p \to\neg q) \wedge q] \to \neg p$ is a tautology?