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Hyperplane
  • Member for 10 years, 4 months
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  • Germany
23 votes
1 answer
500 views

A possible converse to the Cayley-Hamilton theorem?

14 votes
1 answer
407 views

Recursive integrals a la $\int_{\int_y^xg(t)dt}^{\int_x^yg(t)dt}g(t)dt$

14 votes
1 answer
273 views

Characterization of the subspaces of $\mathbb R^{m\times n}$ induced by rank-1 matrices?

12 votes
3 answers
1k views

Do flat functions with flat Fourier transform exist?

10 votes
1 answer
313 views

Can the conjugate $\phi^{-1} \circ A \circ \phi$ be linear for nonlinear $\phi$?

8 votes
1 answer
343 views

Fastest way of multiplying two $n×n$ matrices for fixed $n=1,2,3,\ldots$?

6 votes
3 answers
508 views

How to solve $\dot x(t) = x(2t)$ [duplicate]

6 votes
2 answers
218 views

Can unlimited hypernaturals be represented by increasing sequences?

6 votes
3 answers
529 views

Why do we call Vector Spaces Vector Spaces and not Linear Spaces?

6 votes
0 answers
201 views

How many functions does it take to solve polynomial equations?

5 votes
1 answer
221 views

Maximum Entropy Distribution with Reciprocal Symmetry

5 votes
2 answers
108 views

Show $\lim_{|a|\to\infty}\int_a^{a+\epsilon} f(u(x)) d x = 0$

5 votes
1 answer
275 views

How irregular can $f'$ be beyond Darboux's Theorem?

4 votes
1 answer
482 views

Reference for Taylor's Theorem $\mathbb R^n \to \mathbb R^m$

4 votes
0 answers
101 views

List of Naturally Isomorphic Real Vector Space Pairs

4 votes
1 answer
216 views

Does the matrix exponential of low-rank matrices have any notable properties?

3 votes
0 answers
61 views

Computability of Vector Representations without Inner Products.

3 votes
1 answer
66 views

Weird hexagons distribution of singular vectors of random matrices.

3 votes
1 answer
469 views

Order of antiderivatives of Schwartz functions

3 votes
3 answers
115 views

Are monotone limited hypersequences converging?

3 votes
1 answer
69 views

Does the function which unpacks singletons have a name?

3 votes
0 answers
43 views

The differential equation $u'\cdot v + A\cdot u = w$

3 votes
1 answer
98 views

Name of "divided difference" transform $\frac{f(x)-f(x_0)}{x-x_0}$ and special case $\frac{e^x - 1}{x}$?

2 votes
0 answers
44 views

Best notation for universal / "fibrated" functions?

2 votes
0 answers
92 views

Are all computable functions fixed-point computable?

2 votes
0 answers
15 views

Iterative tests for positive-definiteness in large scale setting

2 votes
2 answers
165 views

Best approximation of an arbitrary matrix by a distance matrix

2 votes
2 answers
381 views

Conservation of mass in hyperbolic PDE [reference request]

2 votes
2 answers
1k views

Series expansion of $\tan^2$ and $\tanh^2$

2 votes
0 answers
38 views

Symmetry Respecting Formula for Product Distributions