User Tsuyoshi Ito - MathOverflow

Tsuyoshi Ito

Member for 13 years, 8 months
Last seen more than 6 years ago

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18 Answers

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38 votes

Function satisfying $f^{-1} =f'$

answered Jul 31, 2010 at 22:02

18 votes

Accepted

Ask some matrix eigenvalue inequalities.

answered Jul 19, 2011 at 3:09

17 votes

Accepted

How fast are a ruler and compass?

answered Jul 29, 2010 at 21:44

13 votes

Accepted

Solving the equation $xax=b$ in a C*-algebra.

answered Jul 20, 2011 at 19:46

11 votes

Accepted

Zero-knowledge proof of positivity

answered Aug 23, 2010 at 10:55

11 votes

The role of completeness in Hilbert Spaces

answered Aug 28, 2010 at 23:19

8 votes

Computing Simultaneous Hamming Neighborhood for a Set of Strings

answered Jul 18, 2011 at 23:34

7 votes

Accepted

Residual finiteness of groups versus residual finiteness of semigroups

answered Aug 2, 2010 at 20:26

6 votes

Accepted

To what degree do min-cuts specify the cut function of a graph?

answered Aug 24, 2010 at 20:18

4 votes

Notation for a graph without any edges?

answered Aug 26, 2010 at 11:32

4 votes

How to combine linear constraints on a matrix and its inverse?

answered Aug 22, 2010 at 12:39

4 votes

Accepted

A conjecture on a Subset Power Sum Problem motivated by Computer Science

answered Oct 18, 2010 at 12:15

3 votes

Accepted

Locating a submatrix within a matrix

answered Oct 21, 2010 at 2:55

2 votes

Accepted

Decidability of matrix algebra

answered Jul 30, 2010 at 18:15

1 vote

Suggest effective heuristic (not precise) graph colouring algorithm

answered Aug 24, 2010 at 2:21

1 vote

Accepted

Finding regions where multi-variate polynomials are positive

answered Aug 8, 2010 at 12:19

1 vote

Accepted

a provable upper bound on the summation

answered Aug 14, 2010 at 11:16

1 vote

Decidability of matrix algebra

answered Aug 30, 2010 at 14:33