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 Apr18 awarded Popular Question Oct10 awarded Popular Question Aug5 awarded Yearling Jul2 awarded Curious May30 comment Is $\dot u/\dot \phi$ is the same as $\mathrm du / \mathrm d\phi$? Ah, the inverse function theorem holds in general if it is invertible. Good to know! May30 accepted Is $\dot u/\dot \phi$ is the same as $\mathrm du / \mathrm d\phi$? May29 revised Is $\dot u/\dot \phi$ is the same as $\mathrm du / \mathrm d\phi$? Add duplicate May29 asked Is $\dot u/\dot \phi$ is the same as $\mathrm du / \mathrm d\phi$? May8 comment Two halls 6 and 9 meters perpendicularly intersect. Optimization @user2171981 I guess you should be able to carry it around the corner. May8 asked Chain rule for tensor of family of tensor fields Mar21 comment Why do we require radians in calculus? In Physics, radians are unitless, but sometimes still mentioned. Just like counts/s or something like that. I think it is good to make it explicit. Feb27 awarded Good Question Feb3 asked Closed complex integral that does not vanish Jan21 accepted Residuals and an identity of the cotangent Jan21 comment Residuals and an identity of the cotangent Okay, I think I got it now. The doubling relation implies that $h(2z)$ is the mean of the values at $z$ and $z+\pi/2$. Therefore, if $2z$ is on the circle, it cannot be the maximum, if $h$ is not a constant. See my solution. Jan21 comment Residuals and an identity of the cotangent “principal part” is the “Hauptteil der Laurentreihe”? I will keep working on it, that is fair :-) Jan21 comment Residuals and an identity of the cotangent For the first part, I think I will manage it. For the second part: Having same poles with same residue means that the difference will have no poles? This makes some sense. Being odd implies $\equiv 0$ once shown that it is constant, is fine too. However, how do I apply this doubling relation? I do not see that yet. Jan21 comment Residuals and an identity of the cotangent @DanielFischer: Thanks, I fixed it. Jan21 revised Residuals and an identity of the cotangent deleted 6 characters in body Jan21 asked Residuals and an identity of the cotangent