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 Apr16 accepted How can I find projection of $x^3$ in $L^2[-1.1]$ Apr16 accepted $\max$ when $x \in H$ Hilbert and $q \in A^\bot$ Apr2 comment differentiable structure on mobius strip Okay. But just one more question (I'm very new to this DG and I'm not reading the book in order). Do I have to use the covering map $\epsilon:\mathbb{R} \to \mathbb{S}^1$ to construct an atlas on $M$? Apr2 comment differentiable structure on mobius strip Could you help me with the explicit construction part using $p$'s covering property? Apr2 asked differentiable structure on mobius strip Mar31 accepted Does every LCS has a convex balanced local base? Mar23 asked Does every LCS has a convex balanced local base? Mar16 revised $\max$ when $x \in H$ Hilbert and $q \in A^\bot$ added 96 characters in body Mar16 asked $\max$ when $x \in H$ Hilbert and $q \in A^\bot$ Mar11 asked How can I find projection of $x^3$ in $L^2[-1.1]$ Feb9 awarded Popular Question Jan26 revised How to integrate $(x^2 - y^2) / (x^2 + y^2)^2$ added 80 characters in body Jan26 asked How to integrate $(x^2 - y^2) / (x^2 + y^2)^2$ Jan15 comment Is there any “formula” that allows us make change of variables in surface integrals? If I may, could you give me the reference textbooks for the above? Dec23 comment Proof of Cauchy Riemann Equations in Polar Coordinates I think this is a standard approach though at its present form it is not completely rigorous. But surely this can be made rigorous by applying some MVT argument along one of the lines above. Dec4 revised What is general relationship between Lebesgue-Stieltjes measurability and Lebesgue measurability? added 476 characters in body Dec4 asked What is general relationship between Lebesgue-Stieltjes measurability and Lebesgue measurability? Nov21 revised If $x$ is a Lebesgue point of $f$, $f \in L^p$ and $f(x)=0$, then it is a Lebesgue point of $f^p$ where $p>1$ (finite)? added 88 characters in body Nov21 asked If $x$ is a Lebesgue point of $f$, $f \in L^p$ and $f(x)=0$, then it is a Lebesgue point of $f^p$ where $p>1$ (finite)? Nov11 awarded Popular Question