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Question about definition of 'distribution'

answered Nov 14, 2022 at 2:24

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Let $A_1, A_2, ..., A_k\in M_n(\mathbb{R})$ be symmetric matrices such that $A^2_1+A^2_2+...+A^2_k=0$. Prove that $A_i=0$ for every $i=1,2,...,k$.

answered Nov 10, 2022 at 19:15

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Application of chain rule, and some recursion

answered Oct 12, 2020 at 17:11

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Application of the chain rule to $3$-layers neural network

answered Oct 14, 2020 at 17:26

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Does ⋮ mean "is divisible by" in mathematical notation?

answered Oct 14, 2021 at 3:02

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Why dont we only consider complete measure spaces?

answered Jun 27, 2022 at 17:04

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Left and right eigenvectors cannot be orthogonal

answered Oct 10, 2022 at 15:26

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What do you call the converse of an invariant subspace of an operator?

answered Aug 3, 2022 at 0:12

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Exemple where tower property of conditional expectation is NOT verify

answered May 23, 2022 at 18:45

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Which definition of "power" is true: Britannica's or Wikipedia's?

answered Sep 19 at 3:42

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$\sqrt {x^2} = |x|$ : how to relate $\sqrt {x^2}$ to the concept of "distance to $x$ from $0$"?

answered Jun 7, 2022 at 2:25

1 vote

quantile function and distribution function

answered Nov 25, 2022 at 0:23

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Proof that there is precisely one row-reduced matrix per row space

answered Jun 6, 2022 at 22:25

1 vote

Rank nullity theorem proof

answered Jun 6, 2022 at 16:54

1 vote

'Rotating' axes along a ball joint.

answered Jun 8, 2020 at 16:03

1 vote

Range of answer: Least squares problem in a case of a rank deficient system

answered Feb 28, 2021 at 8:11

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Substochastic matrix spectral radius

answered Oct 15, 2021 at 7:12

1 vote

How to find the change of basis matrix using inconvenient vectors

answered Oct 29, 2020 at 18:59

0 votes

2-Norm of a Submatrix is $\leq$ 2-Norm of Original Matrix

answered Jan 25, 2021 at 23:23

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Definition of Conditional Expectation and its Uniqueness

answered Nov 9, 2022 at 0:55

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Projection definition in Linear Algebra

answered Aug 8, 2022 at 16:59

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Is a random variable constant a.e. iff it is trivial sigma-algebra-measurable?

answered Jul 16, 2022 at 3:52

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How to describe the mapping from Random Variable $(X, Y)$ to a function of $X$? For example, $g(X):=E[Y|X]$.

answered Mar 24 at 2:18

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Does this matrix have to be row reduced in order to have a pivot column?

answered Oct 11, 2022 at 4:07

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24 Answers

Question about definition of 'distribution'

Let $A_1, A_2, ..., A_k\in M_n(\mathbb{R})$ be symmetric matrices such that $A^2_1+A^2_2+...+A^2_k=0$. Prove that $A_i=0$ for every $i=1,2,...,k$.

Application of chain rule, and some recursion

Application of the chain rule to $3$-layers neural network

Does ⋮ mean "is divisible by" in mathematical notation?

Why dont we only consider complete measure spaces?

Left and right eigenvectors cannot be orthogonal

What do you call the converse of an invariant subspace of an operator?

Exemple where tower property of conditional expectation is NOT verify

Which definition of "power" is true: Britannica's or Wikipedia's?

$\sqrt {x^2} = |x|$ : how to relate $\sqrt {x^2}$ to the concept of "distance to $x$ from $0$"?

quantile function and distribution function

Proof that there is precisely one row-reduced matrix per row space

Rank nullity theorem proof

'Rotating' axes along a ball joint.

Range of answer: Least squares problem in a case of a rank deficient system

Substochastic matrix spectral radius

How to find the change of basis matrix using inconvenient vectors

2-Norm of a Submatrix is $\leq$ 2-Norm of Original Matrix

Definition of Conditional Expectation and its Uniqueness

Projection definition in Linear Algebra

Is a random variable constant a.e. iff it is trivial sigma-algebra-measurable?

How to describe the mapping from Random Variable $(X, Y)$ to a function of $X$? For example, $g(X):=E[Y|X]$.

Does this matrix have to be row reduced in order to have a pivot column?