Gregor de Cillia's user avatar
Gregor de Cillia's user avatar
Gregor de Cillia's user avatar
Gregor de Cillia
  • Member for 9 years, 1 month
  • Last seen more than a week ago
21 votes
Accepted

Matrix $A^T A$ as sum of outer products

10 votes
Accepted

How do I show that the probability of the union of events is not larger than the sum of the individual probabilities?

5 votes
Accepted

How to solve $\int \frac{1}{1-y^2}$ with respect to $y$?

3 votes
Accepted

Proving Lipschitz continuity of a piecewise function

3 votes

"Standard" proof that open disks in $\mathbb{R}^2$ are connected?

3 votes

Probability of one stock price rising, given probabilities of several prices rising/falling

3 votes
Accepted

Proving volume of a sphere

2 votes
Accepted

Proving that product of transpose matrix and the matrix is inversible

2 votes

Integral of $x^2 e^{-x^2}$

2 votes

How can one know every Cauchy sequence in a complete metric space converges?

2 votes

Why $|x-y|<1\implies|y|\leq |x|+1$?

2 votes
Accepted

Question about how the determinant of a square matrix can help determine whether a set of vectors is a basis.

2 votes
Accepted

Finding distribution function for a random variable defined by a conditional probability

1 vote
Accepted

Is there a good bound for $\int_{a}^{\infty} x p(x) dx \approx \mathbb{E}[X] \mathbb{P}(\{X > a\})$

1 vote

Prove that $f$ has a minimum

1 vote

$C_1$ curve length proof deficiency

1 vote
Accepted

What is relative distance and how can you tell?

1 vote

Finding Eigenvectors for $3 \times 3$ matrix with rows of zeros.

1 vote

Banach contraction theorem exercise

1 vote

Showing that a sequence converges, in distribution, to a normal r.v.

1 vote

Sum of $1/n+1/(n-2) + 1/(n-4) + \cdots $

1 vote
Accepted

How to solve the following linear differential equation?

1 vote

Playing roulette with an infinite budget

1 vote
Accepted

How to get from the statement $(AB'+C'A'+C'B')$ to equivalent statement $(AB'+C'A')$?

1 vote
Accepted

How to compute $\sum\limits_{a=1}^{\infty}\int_0^b\lambda\left(\int_0^{\lambda}e^{-t}t^{a-1}dt\right)d\lambda$

1 vote
Accepted

Discontinuity of a function

1 vote

What does it mean for a function to increase along a curve?

1 vote

Vector notation for sum over elementwise product of 3 vectors

1 vote
Accepted

Software to find eigenvalues

1 vote

How many outcomes are there when you roll 4 dice?