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Apr
9
accepted Evaluation of Painful Integral:
Mar
25
revised Evaluation of Painful Integral:
added 94 characters in body
Mar
25
asked Evaluation of Painful Integral:
Mar
19
comment Show that bilinear form is $H^1(0,l)$-elliptic/coercive
@riem: Whoops! You're completely right. I'll try to patch this up in a few days.
Mar
16
comment Show that bilinear form is $H^1(0,l)$-elliptic/coercive
Poincare's inequality seem just fine to me.
Mar
16
revised Show that bilinear form is $H^1(0,l)$-elliptic/coercive
deleted 144 characters in body; edited title
Mar
16
answered Show that bilinear form is $H^1(0,l)$-elliptic/coercive
Feb
23
revised functional equations.. I need hints for this problem
added 267 characters in body
Feb
23
answered functional equations.. I need hints for this problem
Feb
22
reviewed Approve taking the diagonal limit
Feb
22
comment Finite and infinite speed of propagation for wave and heat equation
terrytao.wordpress.com/2014/11/05/discretised-wave-equations
Feb
22
comment Exponential decay estimate
@StephenMontgomery-Smith: Bah, you're right! Looks like it's staying though. . .
Feb
22
comment Exponential decay estimate
I think I'd try to exploit the semigroup property $u(x,t) = \exp(t\nabla)g(x)$. The inequality should fall out by expanding $g$ into eigenfunctions. Not sure that the semigroup solution satisfies $u(\partial U, t) = 0$ though.
Feb
22
comment Let $u,v \in \mathbb{R}^n, A = u\cdot v^T$ then prove $\|A\|_2 = \|u\|_2 \; \|v\|_2$
Yes, you are correct it was bad form to switch between notations mid-stream.
Feb
22
comment Let $u,v \in \mathbb{R}^n, A = u\cdot v^T$ then prove $\|A\|_2 = \|u\|_2 \; \|v\|_2$
$u\cdot v^{T}x = \left<v,x\right>u$.
Feb
21
revised Let $u,v \in \mathbb{R}^n, A = u\cdot v^T$ then prove $\|A\|_2 = \|u\|_2 \; \|v\|_2$
added 141 characters in body
Feb
21
answered Let $u,v \in \mathbb{R}^n, A = u\cdot v^T$ then prove $\|A\|_2 = \|u\|_2 \; \|v\|_2$
Feb
18
comment Show that $ \lVert A \rVert_2^2 \leq \lVert A \rVert _1 \lVert A \rVert _ \infty $
@Surb: That's what I was saying. This is not a hint, it's a solution!
Feb
18
comment Show that $ \lVert A \rVert_2^2 \leq \lVert A \rVert _1 \lVert A \rVert _ \infty $
This is a hint?
Feb
10
comment Mellin transform defined for function on group $(\mathbb{R}^{+}, \times)$
Looks like you're right, but to be fair, long Wikipedia articles tend to be a stylistic mess. I was hoping for an answer of bounded length here . . .