Alan C
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 Mar14 asked Example to show that multiplication by ideals and intersection of submodules do not commute May21 asked showing exact functors preserve exact sequences (abelian categories, additive functors, and kernels) Jun13 asked How to show that this function (related to the zeta function) is even? May21 asked Does $f, f' \in L^1([0, \infty))$ imply that $\lim_{x \to \infty} xf(x) = 0$? Apr11 asked Transpose of a linear operator on functions Jan22 answered Why is $y = \sqrt{x-4}$ a function? and $y = \sqrt{4 - x^2}$ should be a circle Oct7 asked Is there a geometric argument that the Legendre transform of a convex function is convex? Sep1 asked Is there a simple way to bound this contour integral? Aug29 asked Bounding a function by its second derivative using Fourier series Aug18 answered How to show that e.g. $\cos(z)$ is analytic using Cauchy- Riemann differential equations? Aug8 asked Proving the mean value property of harmonic functions using distributions? Jan19 asked Fundamental domain for the group of transformations generated by $\tau \mapsto \tau + 2$ and $\tau \mapsto -1/\tau$ Nov9 asked Can the word “derive” be used to mean “take the derivative of”? Nov6 answered Is there a methodical way to compute Euler's Phi function Sep8 asked How to show that $\lim\limits_{x \to \infty} f'(x) = 0$ implies $\lim\limits_{x \to \infty} \frac{f(x)}{x} = 0$? Aug9 answered How do I prove the divergence of this series? Jun7 asked How does the parallelogram law imply the existence of an inner product for a given norm? May27 asked Understanding the Schwarz reflection principle Jan16 asked Defining the determinant of linear transformations as multilinear alternating form