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 Nov15 awarded Yearling Nov15 awarded Yearling Feb2 awarded Nice Answer Nov20 answered A version of existence and uniqueness of solution for an initival value problem of ODE Nov19 answered If $f \in\operatorname{Lip}_K[a, b]$, show that $f$ can be uniformly approximated by polynomials in $\operatorname{Lip}_K[ a, b]$. Nov19 revised Inverse estimate of gradient of Sobolev function added 14 characters in body Nov19 answered Inverse estimate of gradient of Sobolev function Nov19 revised Proof of an inequality of $L^p$ norms added 232 characters in body Nov19 revised Proof of an inequality of $L^p$ norms added 323 characters in body Nov19 revised Proof of an inequality of $L^p$ norms added 323 characters in body Nov19 answered Proof of an inequality of $L^p$ norms Nov19 comment Quasiconvex and quasiconcave graphs There are several definitions of quasiconvexity in the literature. Could you please tell us which one you are referring to? Nov18 answered Convergence of an improper integral - II Nov18 comment Is every connected metric space with at least two points uncountable? Yes, you are right. Since the problem was posed for a metric space, instead of invoking the Urysohn Lemma, I constructed a Urysohn function explicitly. Nov18 comment Inequality involving a sequence in Hilbert space weak lower semicontinuity of norm will not give you the result? Nov18 awarded Commentator Nov18 comment Find the sum of the first $n$ terms of $\sum^n_{k=1}k^3$ Please consider the special case n=4 and try to see where you are going wrong. Nov18 comment Wedge product with a non-degenerate form What you are asking is essentially related to the notion of exterior annihilators and divisibility. You may refer to the book "The Pullback Equation for Differential Forms" by Csato-Dacorogna-Kneuss for more information in this direction. Nov18 answered Wedge product with a non-degenerate form Nov18 comment Is every connected metric space with at least two points uncountable? That $f(X)=[0,1]$ follows from the fact that X is connected.