MathBeginner

97 Questions

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Why $\left|\int f f^{q-1}\right|=\|f\|_q^q$?

Jan 6 '18 at 17:42 tristan 2,199

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Why $\log(\frac{2R}{|x|})\geq C(n-k+1)$ for $2^{k}\leq|x|<2^{k+1}$?

Dec 21 '17 at 9:50 MathBeginner 757

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Why $\forall \varphi\in W_0^{1,2},\int_\Omega \Delta u\varphi=0\implies \Delta u=0$

Jun 8 '17 at 19:38 Surb 40.5k

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Prove $\|u\|_{L^2(B_2\backslash B_1)}\leq 2^{(d-1)/2}\|\nabla u\|_{L^2(B_2\backslash B_1)}$ for all $u\in H_0^1(B_2\backslash B_1)$.

Jan 23 '17 at 15:50 MathBeginner 757
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Why $\iint_\Omega f(x,y)dxdy=\iint_{\Sigma}f(x(u,v),y(u,v))|J|dudv$?

Jan 22 '17 at 16:55 MathBeginner 757

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How can I show that $\mathcal P(\mathbb N)$ is uncountable. [duplicate]

Oct 2 '16 at 19:15 Andrés E. Caicedo 66.6k

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