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Apr
18
comment Continuity of integral from x to x+1 of Lp function
Hint : Holder .
Mar
24
comment Wave equation in three space dimensions
The dot just means the $x$ variable. As you can see, the estimate only depends on the $t$ slice.
Mar
8
comment How do none of the of the polynomials have a degree 2?
It is definitely wrong because $x^2$ is a degree 2 polynomial!
Mar
6
comment How to handle derivative of absolute value?
Please look up the definition of weak derivative. The function might have a derivative in this sense.
Mar
6
comment Two norms $||.||_1$ and $||.||_2$ on a vector space $V$ are equivalent.
This question has been answered at least 50 times on this site.
Mar
6
comment Find the limit of $\lim\limits_{x\rightarrow0}\frac{x}{\tan x}$.
It was wrong. Now it's correct.
Mar
6
comment Find the limit of $\lim\limits_{x\rightarrow0}\frac{x}{\tan x}$.
False? ${}{}{}{}$
Mar
6
comment What decides if a Coxeter Group is “crystalline” or “non-crystalline”?
This is going to be very hard to completely intractable depending on how much math you know. Do you know any group theory? Have you read the wikipedia article on Coxeter groups? It might be a little easier to read as an introduction than a paper.
Feb
27
comment About a theorem on stability of sytems of autonomous ODEs
Is that word for word what the theorem says? It seems to be wrong then by your counterexample.
Feb
27
comment Solve 2nd order ordinary differential equation by Laplace transforms and convolution of their inverse functions. (5.6-40)
Not correct. You can easily check by plugging it into your original equation.
Feb
26
comment How to solve $tx'(t) = (2t^2 + 1)x(t) + t^2$?
This seems to be a simple 1d problem that you can solve with an integrating factor.
Feb
24
comment Given two increasing continuous functions $f,g$ prove that $(b-a) \int^b_a f(x)g(x) dx > \int^b_a f(x) dx \int^b_a g(x) dx$
You might want to check that your derivative is correct.
Feb
11
awarded  Popular Question
Jan
13
comment Integral $\int\frac{(\sin(x))^2}{x^2+1} dx$
@Shadock You would have to cleverly introduce a parameter.
Jan
13
comment Calculating certain functions if only certain buttons on a calculator are permitted
What do you know about triangles?
Jan
13
comment 2-transitively, formula
What have you tried?
Jan
13
comment how to prove $f(x)= x^2$ is uniformly continuous on $\mathbb{N}$
@SRX That is in fact not true.
Jan
13
comment Integral $\int\frac{(\sin(x))^2}{x^2+1} dx$
This looks like a good candidate for differentiation under the integral.
Dec
15
comment A more general Bessel Function
I swear it wasn't in that book when I was looking at it yesterday!
Dec
15
accepted A more general Bessel Function