User G. Fougeron

5 votes

Accepted

If $p$ is negative, is it true that $\ln(p^2) = 2\ln(p)$?

answered Oct 12, 2021 at 11:25

4 votes

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When does a real, positive definite matrix have positive entries?

answered Feb 24, 2017 at 9:13

4 votes

Finding a matrix interpolation

answered Jun 3, 2021 at 8:34

3 votes

For real numbers $z$ and $w$, $|(1+z)(1+w)-1| \leq (1+|z|)(1+|w|)-1$.

answered Dec 1, 2021 at 15:19

2 votes

Find the integer root of the logarithmic equation: $\log_2\left(\frac x5\right)+\log_x\left(\frac 25\right)=\log 4$

answered Oct 28, 2021 at 13:44

2 votes

Meaning of triangle symbol

answered Jun 9, 2021 at 15:32

2 votes

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Limit of vector sequence

answered May 26, 2021 at 14:50

2 votes

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What are Fletcher-Reeves and the Wolfe inexact line search?

answered May 27, 2021 at 13:05

2 votes

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Undertsanding Laplace Transform output

answered May 26, 2021 at 12:30

2 votes

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Does the series converge: $\sum_2^\infty\frac{\log n}{n(\log \log n)^2}$

answered Dec 18, 2017 at 10:48

2 votes

What's gone wrong in my example to show that $\frac{\partial}{\partial \underline c}(A\underline c) = A$?

answered Jul 23, 2019 at 13:47

2 votes

Limit in combination with an infinite series

answered Apr 27, 2015 at 14:08

2 votes

The recurrence $a_k(n) = \sum_{0\leqslant j<n} a_{k-1}(n+j)$

answered May 28, 2015 at 10:16

1 vote

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Positive weights in Radial Basis Functions

answered Apr 1, 2016 at 9:51

1 vote

Determinant of a Matrix 2

answered Apr 29, 2015 at 9:35

1 vote

Accepted

Monotonicity of a fraction.

answered Apr 30, 2015 at 10:43

1 vote

The range of arc-cotangent function & arccot(-1).

answered Nov 21, 2014 at 16:40

1 vote

Does Runge Kutta need future state of system?

answered Nov 21, 2014 at 16:50

1 vote

Interchange of derivatives

answered Dec 17, 2014 at 14:21

1 vote

Decelerate function to match with the example

answered Jan 12, 2021 at 9:05

1 vote

Accepted

Why is $\lim_{t \to 0} \frac{f(x + t(y-x)) - f(x)}{t} = \nabla f(x)^T\cdot (y-x)$?

answered Feb 8, 2021 at 15:32

1 vote

Accepted

Eigen decomposition of Householder operator

answered Feb 22, 2021 at 12:45

1 vote

Is the definition of angular momentum $\vec{L} = \vec{r} \times \vec{p}$ rigorous?

answered Apr 6, 2021 at 14:25

1 vote

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prooving volume formular for simplices

answered Jan 16, 2019 at 11:29

1 vote

Polynomials and Inner Product

answered May 27, 2021 at 13:16

1 vote

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Under what conditions, the following equation may not hold: $A = B X$, where $A \in M_{m,n}$ and $B \in M_{m,p}$ are given, and $X \in M_{p,n}$?

answered May 27, 2021 at 13:32

1 vote

What is the best ODE solver for stability and speed?

answered May 26, 2021 at 15:15

1 vote

Show the convergence of the recursive sequence without computing it's limit

answered May 27, 2021 at 11:40

1 vote

Find the dimension of the system with equations and variables

answered Jun 10, 2021 at 8:18

1 vote

Accepted

Endomorphisms that commute with a specific, non-diagonalizable endomorphism

answered Jun 11, 2021 at 13:42

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48 Answers

If $p$ is negative, is it true that $\ln(p^2) = 2\ln(p)$?

When does a real, positive definite matrix have positive entries?

Finding a matrix interpolation

For real numbers $z$ and $w$, $|(1+z)(1+w)-1| \leq (1+|z|)(1+|w|)-1$.

Find the integer root of the logarithmic equation: $\log_2\left(\frac x5\right)+\log_x\left(\frac 25\right)=\log 4$

Meaning of triangle symbol

Limit of vector sequence

What are Fletcher-Reeves and the Wolfe inexact line search?

Undertsanding Laplace Transform output

Does the series converge: $\sum_2^\infty\frac{\log n}{n(\log \log n)^2}$

What's gone wrong in my example to show that $\frac{\partial}{\partial \underline c}(A\underline c) = A$?

Limit in combination with an infinite series

The recurrence $a_k(n) = \sum_{0\leqslant j<n} a_{k-1}(n+j)$

Positive weights in Radial Basis Functions

Determinant of a Matrix 2

Monotonicity of a fraction.

The range of arc-cotangent function & arccot(-1).

Does Runge Kutta need future state of system?

Interchange of derivatives

Decelerate function to match with the example

Why is $\lim_{t \to 0} \frac{f(x + t(y-x)) - f(x)}{t} = \nabla f(x)^T\cdot (y-x)$?

Eigen decomposition of Householder operator

Is the definition of angular momentum $\vec{L} = \vec{r} \times \vec{p}$ rigorous?

prooving volume formular for simplices

Polynomials and Inner Product

Under what conditions, the following equation may not hold: $A = B X$, where $A \in M_{m,n}$ and $B \in M_{m,p}$ are given, and $X \in M_{p,n}$?

What is the best ODE solver for stability and speed?

Show the convergence of the recursive sequence without computing it's limit

Find the dimension of the system with equations and variables

Endomorphisms that commute with a specific, non-diagonalizable endomorphism