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coboy
  • Member for 2 years, 10 months
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6 votes
1 answer
122 views

Is Fubini’s theorem behind this equality?

5 votes
3 answers
2k views

Proof of Bolzano Weierstrass Theorem in $\mathbb{R}^n$

4 votes
0 answers
63 views

Find the limit of $x^2 +xc + d$ when $x$ goes to $0^{-}$ using the $\varepsilon-\delta$ definition of a limit

4 votes
0 answers
80 views

Limit of $u_n = \sum_{k=1}^{n}\frac{1}{\sqrt{n^2+2k}}$

4 votes
2 answers
197 views

Show that a family is uniformly integrable

4 votes
3 answers
147 views

Conditional expectation and computation of double integrals

4 votes
0 answers
67 views

Convergence theorem for bounded continuous martingale in $L^2$

3 votes
2 answers
154 views

Set equality using quantifiers

3 votes
1 answer
69 views

From maximal inequality in finite time to continuous time

3 votes
1 answer
126 views

Concerns about the definition of Hawkes process

3 votes
1 answer
66 views

A proof that the null linear mapping is the only one whose matrix representation does not depend on the basis [FALSE]

3 votes
0 answers
59 views

A "développement limité" for function of several variables at the order $2$

3 votes
1 answer
126 views

P almost continuous version of a stochastic process

3 votes
1 answer
104 views

What is interesting about random variable from a mathematical point of view?

3 votes
1 answer
92 views

Basis criterion for vector space

3 votes
1 answer
58 views

Convexity of a ball in any normed space and in any metric space [closed]

3 votes
1 answer
83 views

Is this proof of $\binom{n}{k}+\binom{n}{k-1} = \binom{n+1}{k} $ valid?

2 votes
1 answer
89 views

Singular value decomposition of a matrix and eigendecomposition of the product of this matrix.

2 votes
1 answer
73 views

A useful criterion on stopping times

2 votes
2 answers
270 views

Gaussian process uniquely determined by mean and covariance function

2 votes
0 answers
92 views

Stochastic integral for simple process

2 votes
1 answer
66 views

A proof of a sufficient condition to have that $f : A\subset\mathbb{R}^n\to\mathbb{R}$ is differentiable

2 votes
2 answers
68 views

Show that $GL_n(\mathbb{R})$ is open in $\mathcal{M}_n(\mathbb{R})$ by showing that the complement is closed?

2 votes
1 answer
65 views

Is this proof of $\sup_{x\in X}\inf_{y\in Y}u(x,y)\leq\inf_{y\in Y}\sup_{x\in X}u(x,y)$ for $u$ bounded correct?

2 votes
0 answers
63 views

Show the continuity of a function between vector space

2 votes
1 answer
37 views

What is wrong with this proof about reaching time to a closed set being a stopping time?

2 votes
1 answer
103 views

Notation of inverse matrix and confusion

2 votes
0 answers
60 views

Expectation of the minimum between two stopping times

2 votes
0 answers
44 views

Watanabe characterization of a Poisson process

2 votes
0 answers
72 views

$0$-$1$ law for brownian motion

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