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 Feb 4 awarded Popular Question Dec 17 comment surface has two geodesic with fixed angle must be a developing surface Yes, it is a regular surface contained in $R^3$! Dec 16 comment surface has two geodesic with fixed angle must be a developing surface I mean, as $u$-curve and $v-curve$ are two families of curves, there exists two families of curves, each of which are consist of geodesics, what's more every two pair of curves comes from the two families respectively forms a constant angle $\theta$. Dec 12 asked surface has two geodesic with fixed angle must be a developing surface Dec 8 revised Does the dual space of $W^{1,2}(B)$ contain $L^1(B)$ edited title Dec 8 asked Does the dual space of $W^{1,2}(B)$ contain $L^1(B)$ Nov 30 asked Are Morrey spaces reflexive? Jul 20 accepted Construct an exactly smooth function as a cutoff of half ball with vanishing normal dirivative Jul 19 asked Construct an exactly smooth function as a cutoff of half ball with vanishing normal dirivative May 21 awarded Inquisitive May 20 asked Calculate a Limit and find the Sup Jan 22 awarded Popular Question Jan 13 comment Compute complex Gaussian integral I can only show the nonvanishing near $z=0$, when $z$ is large, certainly there are zeros of $\det(A(z))$. Jan 12 comment Compute complex Gaussian integral It seem in order to show that $f(z)=\sqrt{\det A(z)}$, where $A(z)=A+z(e_{ij} +e_{ji} )$, is holomorphic, I need to show that $C∖\{\det(A(z))|Re(A(z))>0\}$ can be cutted by a path from $0$ to $\infty$ , but what I can show is only that $f(z)$ is nonvanishing near $z=0$. Jan 11 comment Compute complex Gaussian integral It seems not easy to show that both sides are holomorphic, in fact use the complex one variable theory, it is not clear what is the domain space of $z_{ij}=a_{ij}+b_{ij}i$. Jan 11 accepted Compute complex Gaussian integral Jan 10 comment Compute complex Gaussian integral @paulgarrett can you formulate an answer? Jan 10 revised Compute complex Gaussian integral added 45 characters in body Jan 10 comment Compute complex Gaussian integral @NickThompson Sorry I forgot a condition, that $A$ is symmetric. Thanks Paul garrett, I check the excercise again, and find the missing condition. Jan 10 comment Compute complex Gaussian integral @NickThompson Yes.