User Sunni

29 votes

9 answers

5k views

Is there a good reason why $a^{2b} + b^{2a} \le 1$ when $a+b=1$?

inequalities

asked Mar 5, 2010 at 16:18

28 votes

16 answers

4k views

Particular problem solved by solving a more general problem.

soft-question big-list

asked Apr 13, 2010 at 15:29

26 votes

2 answers

2k views

Is there a combinatorial interpretation of the identity $\sum_{k=0}^m 2^{-2k} \binom{2k}{k} \binom{2m-k}{m} =4^{-m} \binom{4m+1}{2m}$?

co.combinatorics combinatorial-identities

asked Apr 13, 2010 at 13:34

17 votes

5 answers

2k views

How to prove a known inequality from a book

inequalities

asked Jul 1, 2011 at 3:13

8 votes

5 answers

2k views

A plausible inequality

inequalities cauchy-schwarz-inequality

asked Apr 2, 2010 at 17:50

8 votes

2 answers

2k views

A question on a trace inequality

linear-algebra

asked Apr 10, 2010 at 14:23

8 votes

1 answer

309 views

Positivity of a rational function

ca.classical-analysis-and-odes special-functions

asked Feb 12, 2011 at 4:26

7 votes

8 answers

2k views

Examples of inequality implied by equality.

inequalities soft-question big-list

asked Mar 8, 2010 at 16:05

7 votes

2 answers

479 views

The odd power of copositive matrix

oc.optimization-and-control matrices

asked Jun 23, 2011 at 23:56

6 votes

1 answer

958 views

Eigenspace of Euclidean distance matrix.

matrices oc.optimization-and-control

asked Aug 8, 2011 at 14:33

6 votes

1 answer

542 views

On a positivity of a matrix with trace entries.

matrices

asked Mar 3, 2010 at 17:37

5 votes

2 answers

385 views

How to find a solution to a particular Bottcher equation

ca.classical-analysis-and-odes functional-equations

asked Mar 10, 2010 at 1:18

5 votes

1 answer

1k views

Ask some matrix eigenvalue inequalities.

matrices linear-algebra

asked Jul 19, 2011 at 0:01

4 votes

1 answer

388 views

Ask the validity of a scalar inequality

inequalities

asked Jul 24, 2011 at 17:59

4 votes

2 answers

277 views

Spectral order of copositive matrices

matrices

asked Jun 27, 2011 at 0:22

4 votes

1 answer

308 views

Explanation of a proof of an determinant bound?

st.statistics matrices

asked Aug 31, 2011 at 1:02

4 votes

2 answers

675 views

Another plausible inequality.

inequalities

asked Jun 1, 2010 at 4:37

3 votes

5 answers

9k views

What is the angle between two complex vectors?

cv.complex-variables inequalities

asked Oct 1, 2010 at 0:26

3 votes

2 answers

2k views

a matrix similarity problem.

linear-algebra

asked Dec 16, 2010 at 19:49

3 votes

2 answers

912 views

What's known about the 3rd coefficient in the BMV conjecture?

matrices open-problems

asked Mar 6, 2010 at 2:22

3 votes

1 answer

530 views

A question on star-congruence.

linear-algebra

asked Mar 8, 2010 at 1:41

2 votes

2 answers

2k views

How covariance-variance inequality implies Kantorovich inequality

inequalities

asked May 24, 2011 at 23:05

2 votes

2 answers

494 views

Decreasing coefficients?

ca.classical-analysis-and-odes

asked Apr 24, 2010 at 0:10

2 votes

1 answer

371 views

What is the partial derivative in this expression?

ca.classical-analysis-and-odes

asked Apr 26, 2010 at 4:07

2 votes

1 answer

428 views

A question on matrix decomposition.

linear-algebra

asked May 29, 2010 at 15:37

1 vote

1 answer

362 views

A matrix with trace entries.

linear-algebra

asked May 9, 2010 at 3:04

1 vote

3 answers

373 views

monotonicity from 4 term-recursion.

inequalities ca.classical-analysis-and-odes

asked Apr 17, 2010 at 4:42

0 votes

1 answer

505 views

Is this trace inequality true?

linear-algebra

asked Apr 23, 2010 at 15:21

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28 Questions

Is there a good reason why $a^{2b} + b^{2a} \le 1$ when $a+b=1$?

Particular problem solved by solving a more general problem.

Is there a combinatorial interpretation of the identity $\sum_{k=0}^m 2^{-2k} \binom{2k}{k} \binom{2m-k}{m} =4^{-m} \binom{4m+1}{2m}$?

How to prove a known inequality from a book

A plausible inequality

A question on a trace inequality

Positivity of a rational function

Examples of inequality implied by equality.

The odd power of copositive matrix

Eigenspace of Euclidean distance matrix.

On a positivity of a matrix with trace entries.

How to find a solution to a particular Bottcher equation

Ask some matrix eigenvalue inequalities.

Ask the validity of a scalar inequality

Spectral order of copositive matrices

Explanation of a proof of an determinant bound?

Another plausible inequality.

What is the angle between two complex vectors?

a matrix similarity problem.

What's known about the 3rd coefficient in the BMV conjecture?

A question on star-congruence.

How covariance-variance inequality implies Kantorovich inequality

Decreasing coefficients?

What is the partial derivative in this expression?

A question on matrix decomposition.

A matrix with trace entries.

monotonicity from 4 term-recursion.

Is this trace inequality true?