Question

Without computing $A^{-1}$, what is a good analytic upper-bound for $e^\top A^{-1} e$, where $A$ is positive-definite and $e = (1,\ldots,1)\;$?

score 89 · Answer 1 · 2026-03-27 21:35:32

89

Views

Without computing $A^{-1}$, what is a good analytic upper-bound for $e^\top A^{-1} e$, where $A$ is positive-definite and $e = (1,\ldots,1)\;$?

Published on 27 Mar 2026 - 21:35

score 34 · Answer 2 · 2026-03-27 10:12:53

34

Views

Is it possible to build any condition on $x,y,z \in \Bbb R$ for $x\log(x)+y\log(y)<2z\log(z)$?

Published on 27 Mar 2026 - 10:12

score 45 · Answer 3 · 2020-10-26 08:07:50

45

Views

Upper bound for the smallest integer which makes $nk+1$ prime number

Published on 26 Oct 2020 - 8:07

score 255 · Answer 4 · 2020-10-27 21:13:04

255

Views

How a linear function is bounded below on $R^n$ only when it is zero and not -$\infty$?

Published on 27 Oct 2020 - 21:13

score 636 · Answer 5 · 2020-10-28 09:49:44

636

Views

Upper and Lower semicontinuity and right-left continuity.

Published on 28 Oct 2020 - 9:49

score 60 · Answer 6 · 2026-03-26 06:30:51

60

Views

Lower for the inertial degree $f$ in cyclotomic field

Published on 26 Mar 2026 - 6:30

score 115 · Answer 7 · 2026-03-28 20:59:17

115

Views

Upper bound on number of tuples without satisfying a criterion

Published on 28 Mar 2026 - 20:59

score 72 · Answer 8 · 2020-10-29 10:03:02

72

Views

Prove Lower bound of a set ${x^3 : x<10}$

Published on 29 Oct 2020 - 10:03

score 287 · Answer 9 · 2026-04-03 14:03:49

287

Views

Sample vs Population Covariance Matrices

Published on 03 Apr 2026 - 14:03

score 154 · Answer 10 · 2026-03-27 10:12:59

154

Views

On the quantity $I(q^k) + I(n^2)$ where $q^k n^2$ is an odd perfect number with special prime $q$

Published on 27 Mar 2026 - 10:12

score 36 · Answer 11 · 2020-10-31 15:09:36

36

Views

Getting lower/upper bounds for $a$ and $b$, when solving an equation in positive integers

Published on 31 Oct 2020 - 15:09

score 133 · Answer 12 · 2020-11-01 14:27:57

133

Views

Finding an upper limit on a continuous function

Published on 01 Nov 2020 - 14:27

score 40 · Answer 13 · 2026-03-26 01:11:57

40

Views

Relationship between $\left\Vert A-B \right\Vert$ and $\left\Vert A_s- B_s \right\Vert$ where $A$ is similar to $A_s$ and $B$ is similar to $B_s$?

Published on 26 Mar 2026 - 1:11

score 38 · Answer 14 · 2026-03-25 12:53:02

38

Views

Discarding small eigenvalues to bound rank of a matrix

Published on 25 Mar 2026 - 12:53

score 82 · Answer 15 · 2026-03-25 15:11:12

82

Views

Bounding linear interpolation error for bandlimited functions

Published on 25 Mar 2026 - 15:11

List Question

Without computing $A^{-1}$, what is a good analytic upper-bound for $e^\top A^{-1} e$, where $A$ is positive-definite and $e = (1,\ldots,1)\;$?

Is it possible to build any condition on $x,y,z \in \Bbb R$ for $x\log(x)+y\log(y)<2z\log(z)$?

Upper bound for the smallest integer which makes $nk+1$ prime number

How a linear function is bounded below on $R^n$ only when it is zero and not -$\infty$?

Upper and Lower semicontinuity and right-left continuity.

Lower for the inertial degree $f$ in cyclotomic field

Upper bound on number of tuples without satisfying a criterion

Prove Lower bound of a set ${x^3 : x<10}$

Sample vs Population Covariance Matrices

On the quantity $I(q^k) + I(n^2)$ where $q^k n^2$ is an odd perfect number with special prime $q$

Getting lower/upper bounds for $a$ and $b$, when solving an equation in positive integers

Finding an upper limit on a continuous function

Relationship between $\left\Vert A-B \right\Vert$ and $\left\Vert A_s- B_s \right\Vert$ where $A$ is similar to $A_s$ and $B$ is similar to $B_s$?

Discarding small eigenvalues to bound rank of a matrix

Bounding linear interpolation error for bandlimited functions

Trending Questions

Popular # Hahtags

Popular Questions