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Hyperplane
  • Member for 8 years, 9 months
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15 votes
Accepted

Why does the process defined with $a_{n+2} = \frac{1}{a_n} + \frac{1}{a_{n+1}}$ converge to $\pm\sqrt{2}$ for most choices of the starting values?

13 votes

Is Dirichlet function Riemann integrable?

9 votes
Accepted

Finding $n$ points $x_i$ in the plane, with $\sum_{i=1}^n \vert x_i \vert^2=1$, minimizing $\sum_{i\neq j}^n \frac{1}{\sqrt{\vert x_i-x_j \vert}}$

8 votes

Intuition on spectral theorem

7 votes

Trace of a Matrix Product.

7 votes
Accepted

Finding the solution to a non-homogeneous matrix exponential.

6 votes

Why do we need to reverse a function in the convolution operaton?

5 votes

prove $-\frac{c' x}{c(x)}$ is decreasing. falling elasticity.

5 votes
Accepted

What is the intuition behind the trace of an endomorphism?

5 votes

Unitary matrix commute with function

5 votes
Accepted

Sinc function vs Dirichlet kernel

5 votes
Accepted

Are there any unsolved Problems in Theory of Integration?

5 votes
Accepted

How to prove this Dirac delta limit representation is correct?

5 votes
Accepted

How derivative of matrix leads to its transpose?

4 votes
Accepted

Evaluating an Infinite Limit that Wolfram doesn't like!

4 votes
Accepted

Show that $\{ (1, 0, \dots), (0, 1, 0,\dots), (0, 0, 1, 0,\dots), \dots\}$ is not a basis of $\Bbb R^N$

4 votes

Show that $f(t) = \det(A + tB)$ is a line

4 votes

Euclidean distance (cosine) between two random positive unit vectors in high dimensional space

4 votes
Accepted

How to reconcile these two Jacobi formuli

4 votes
Accepted

Quick question about a picture - area under a normal distribution is always 1

4 votes

Find out the degree of a polynomial $f(z)$

4 votes

Is it true that if $\lim_{n\to\infty} x_n^{1/n}$ exists, then $\lim_{n \to \infty} {x_{n+1}\over x_n}$ exists.

4 votes

Proving that a function with two variables is injective

4 votes
Accepted

Is it true that $\int_0^T e^{tA}\,dt = (e^{TA}-I)A^\dagger$ if $A$ is a psd matrix?

4 votes
Accepted

What does $\mbox{diag}(A)$ denote?

3 votes

How do I take the derivative of $\text{trace}(XX^TY^TYXX^T)$ with respect to the matrix $X$?

3 votes

Zero divisors in the hyperreal numbers

3 votes

Question related to $\operatorname{Max}_X \operatorname{Trace}(AX)$ s.t. $\|X\|=1$

3 votes
Accepted

Does gradient descent for linear regression select the minimal norm solution?

3 votes

very slow convergence of Picard method for solving nonlinear system of equations

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