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user35593's user avatar
user35593's user avatar
user35593
  • Member for 10 years, 9 months
  • Last seen more than a month ago
9 votes
Accepted

Travelling salesman: can the furthest-neighbour algorithm beat the nearest-neighbour?

7 votes
Accepted

Maximize $L^p$ norm over sphere

6 votes

For which $f \in L^2([0,1])$ is $f^\perp \cap C^\infty$ dense in $f^\perp$?

6 votes
Accepted

Combinatorics problem involving counting the number of certain substrings

6 votes
Accepted

Common roots of polynomial and its derivative

5 votes
Accepted

Inverse Hadamard determinant inequality

4 votes

regular polygon question

4 votes
Accepted

Prove or disprove a matrix logarithm equation

4 votes

Is a normal matrix satisfying $A^TA=...$ circulant?

4 votes
Accepted

Fixed point of a function on the circle

4 votes
Accepted

Jacobian has small eigenvalues everywhere in an open set. Does this imply globally attracting fixed point in that set?

4 votes
Accepted

Finding a strictly increasing Collatz sequence of arbitrary length

3 votes

Arithmetic progressions in stopping time of Collatz sequences

3 votes
Accepted

A functional equality

3 votes
Accepted

Infinite dimensional vector spaces

3 votes
Accepted

quadratic matrix equation

3 votes

Minimal distance between random points on the unit circle

3 votes

Is there exists (strictly) convex function on hemisphere?

2 votes

The rank of a perturbed triangular matrix

2 votes

What is the smallest $x$ such that $\lfloor x^n\rfloor$ has the same parity as n?

2 votes

Sum of inverse of multinomial coefficients

2 votes

QR decomposition of matrix

2 votes
Accepted

Prove that the following two optimization problems are equivalent

2 votes
Accepted

Smooth unit vector field on a tetrahedron to interpolate vertex constraints

2 votes

Solving a matrix equation $X=c \cdot AXA' +I$ with a diagonal corrections

1 vote
Accepted

Error estimates for $L^2$ approximation of multivariate $C^k$ functions in terms of norms on derivatives

1 vote

Any generic way to move a psd matrix to its neighbors?

1 vote

formula for repeated finite differences

1 vote

Number of different normalized inner products

1 vote

Complexity of finding the maximum sum divided by product