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Oct
18
awarded  Popular Question
Oct
6
comment A special property of harmonic function
Take an look here
Oct
3
comment The approximation of BV functions
A careful inspection of the proof of this theorem given in thhe book, shows that in fact, the approximation sequence has compact support.
Oct
1
reviewed Close For every topological conjugation $h: \Delta_1 \rightarrow \Delta_2$ we have $h(\omega(p))=\omega(h(p))$, for all $p \in \Delta_1$
Oct
1
accepted What is $\lim_{k\to\infty}\frac{A_k}{\sum_{i=1}^k A_i}$?
Sep
30
awarded  Explainer
Sep
29
comment Solution for Poisson equation
Is there a $\nabla$ in the second inequality?
Sep
27
reviewed Close Homomorphism between symmetric group and general linear group of order n.
Sep
27
reviewed Close When $x\to 0$, what is the order of $(x^2+x^{\frac13})^{\frac15}-(x^2+x^{\frac15})^{\frac13}?$
Sep
27
reviewed Close Least sum of distances
Sep
27
reviewed Leave Open How to prove that a function is left continuous
Sep
27
comment Why Green's function for a bounded domain is negative?
What is your definition of a Green fnction?
Sep
25
reviewed Close Exponential growth's power
Sep
25
reviewed Close Is $f(x)=x$ the solution of an integral equation?
Sep
25
reviewed Leave Open Problem with Functional analysis course
Sep
25
comment Lipschitz condition for open sets
The boundary of the set, can be written as a finite union of sets, which are graphs of Lipschitz functions.
Sep
23
awarded  Yearling
Sep
23
revised Showing If A Function Is Convex/Concave
added 383 characters in body
Sep
23
comment Showing If A Function Is Convex/Concave
You have to change $x-y$ to $y-x$. In this current form, that's not the right way to show that a function is convex. For a reference, see here.
Sep
23
answered Showing If A Function Is Convex/Concave