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Jul
3
awarded  Nice Answer
May
16
comment Test for normability of a metric on a Banach space
Sorry, what do you mean by normable?
May
15
comment Are my results realistic or is there an error somewhere?
It is physically meaningful, and a known environmental issue. It is the reason why the US Navy and geophysical exploration companies have been accused of making marine mammals going deaf. This behavior cause the wave to propagate essentially in 2D and reduces the decay by an order. So sounds are loud in the channel miles away.
May
15
comment Are my results realistic or is there an error somewhere?
This sort of behaviour is common for sound waves under water. Read about the SOFAR channel:en.wikipedia.org/wiki/SOFAR_channel
May
13
comment Tools for learning Finite Element Method
Check out mooseframework.org for how to do some finite elements; you won't have to learn to code.
May
13
comment Tools for learning Finite Element Method
Spectral methods do not converge quickly in the presence of discontinuities. In Mech E, there generally are.
Apr
27
comment 3D Fourier Transform - Angle between $\mathbf{k}$ and $\mathbf{r}$
$\mathbf{a}\cdot \mathbf{b} = |a||b|\cos(\theta)$?
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.