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Hendrra
  • Member for 7 years, 4 months
  • Last seen this week
11 votes
3 answers
981 views

$\sum_{n=1}^{\infty}\frac{1}{n^22^n}$ by integration or differentiation

8 votes
7 answers
11k views

Integrate $\int x e^{x} \sin x dx$

7 votes
1 answer
275 views

Convergence of a random created series

6 votes
4 answers
3k views

How to solve the differential equation $xx'' = (x')^2$?

6 votes
5 answers
3k views

Proving that a sequence of functions converge uniformly

6 votes
1 answer
326 views

Finding if $\phi(t) = \frac{\cos(t)}{1 + t^4}$ is a characteristic function

6 votes
3 answers
183 views

Computing real integral using residues

5 votes
2 answers
2k views

Showing that space of absolutely continuous functions is Banach space

5 votes
2 answers
3k views

The separability of $c, c_0$ and $c_{00}$

4 votes
2 answers
111 views

Absolute convergence of $\sum_{n=1}^{\infty}z_n^2$

4 votes
3 answers
5k views

Proving that $\sin(z+w) = \sin(w) \cos(z) + \sin(z) \cos(w)$ using complex exponentials

4 votes
4 answers
901 views

A disgruntled secretary problem - why my solution is incorrect

4 votes
1 answer
626 views

Checking whether a complex function has an antiderivative

4 votes
4 answers
284 views

Finding the limit of $s((1+\frac{1}{s})^{s} - e)$ as $s$ aproaches infinity [duplicate]

4 votes
2 answers
479 views

Probability of $B_t < 0$ if $B$ is Brownian Motion

4 votes
5 answers
1k views

Computing $e^{tA}$, where $A$ is a matrix

4 votes
1 answer
262 views

An inequality with $e^{ix}$

4 votes
2 answers
83 views

Computing an intergral on a sphere

3 votes
3 answers
377 views

Computing Fourier transform for $\exp(- \alpha t^2)$

3 votes
0 answers
22 views

Looking for a $\sigma$-algebra generated by the set of sets containing $1$

3 votes
1 answer
75 views

Is Wolfram Alpha correct about this limit of an oscillating function?

3 votes
1 answer
217 views

Compute $\mathbb{E} \left(\min(X, Y) | \max(X, Y) \right)$ for $(X,Y)$ i.i.d. uniform on $(0,1)$

3 votes
1 answer
803 views

Probability of reaching a maximum in a random walk

3 votes
1 answer
144 views

Show that $\psi(t)=e^{\lambda (\varphi(t)-1)}$ is infinitely divisble for any characteristic function $\varphi$

3 votes
1 answer
258 views

Proving that if $\varphi(t)$ is an infinitely divisible characteristic function then $|\varphi(t)|$ as well

3 votes
2 answers
78 views

Finding a limit of a matrix raised to the $n$-th power

3 votes
1 answer
1k views

Solving heat equation on a circle

3 votes
1 answer
193 views

Proving that a semialgebraic set is convex

3 votes
2 answers
405 views

Linear transformation and its matrix with respect to unknown bases

3 votes
1 answer
41 views

Finding and area given (integration in polar coordinates)

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