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Axion004
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10 votes
1 answer
3k views

Is it a good idea to create a math blog on Wordpress? [closed]

7 votes
2 answers
13k views

Looking for finite difference approximations past the fourth derivative

7 votes
4 answers
2k views

When can you divide out $dx$ in an integral as if it is a fraction?

6 votes
1 answer
8k views

Finding the derivative of the infinity norm

5 votes
1 answer
172 views

Application of the MacLaurin expansion of $e^2$

4 votes
2 answers
389 views

Computing a derivative through Lie series

4 votes
3 answers
684 views

Solve the inequality $x^2 - 3 > 0$

3 votes
0 answers
288 views

Showing a scheme is convergent through Von Neumann stability analysis

3 votes
1 answer
583 views

Computing the stable manifold for a fixed point

3 votes
1 answer
2k views

Application of Gronwall Inequality to existence of solutions

3 votes
1 answer
324 views

Dirichlet series expansion for Zeta(s)

2 votes
0 answers
120 views

Question about the first step inside the derivation of the Abel-Plana formula.

2 votes
1 answer
332 views

Relationship between perfect squares and infinite series (zeta function)

2 votes
1 answer
213 views

Baby Rudin Theorem 11.35

2 votes
2 answers
109 views

Verfying partial derivatives for an ODE

2 votes
0 answers
574 views

Relationship between subharmonic functions and Laplacian

2 votes
1 answer
43 views

Question about derivation in Fourier series

2 votes
1 answer
472 views

Solve quasi-linear PDE $uu_x+yu_y=x$ through the method of characteristics

2 votes
1 answer
160 views

Solving $xu_x+yu_y=y$ through the method of characteristics

2 votes
2 answers
386 views

Clarification about guessing a particular solution in the method of undetermined coefficients

2 votes
5 answers
194 views

Application of the first part of the fundamental theorem of calculus

2 votes
1 answer
642 views

Can you always bound the derivative of a Sobolev norm by a higher Sobolev norm in $\mathbb R$ and $\mathbb R^n$?

2 votes
1 answer
342 views

Polynomial representation of $\sum\limits_{n=m+1}^N \binom {n-1} m$

1 vote
0 answers
310 views

Multidimensional induction for $m$ variables

1 vote
2 answers
283 views

Application of Poisson Integral Formula and Fourier Series

1 vote
3 answers
296 views

$\int_0^{\pi/2} \sec^a(t)\,dt= \frac{\sqrt{\pi}}{2\Gamma\left(1-\frac{a}{2}\right)}\Gamma\left(\dfrac{1-a}{2}\right)$

1 vote
2 answers
525 views

Integrating factor with $-\ln x$

1 vote
0 answers
703 views

Evans PDE: $Du =0$ a.e. implies that $u$ is a constant a.e.

1 vote
2 answers
307 views

Application of Hölder's inequality: $(a+b)^t \le 2^t(a^t+b^t)$ for $t\ge 1.$

1 vote
1 answer
394 views

The Rayleigh Expansions and Diffraction in Periodic Media