Question

Confusion about the definition of positive definiteness

score 82 · Answer 1 · 2026-03-22 15:49:34

82

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Confusion about the definition of positive definiteness

Published on 22 Mar 2026 - 15:49

score 1.8k · Answer 2 · 2026-03-24 14:02:53

1.8k

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Do we discuss quadratic form of complex matrix?

Published on 24 Mar 2026 - 14:02

score 135 · Answer 3 · 2026-03-17 03:32:57

135

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Where am I making a mistake in showing that countability isn't a thing?

Published on 17 Mar 2026 - 3:32

score 1.2k · Answer 4 · 2018-01-27 03:55:18

1.2k

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How to deal with extended real valued functions in optimization?

Published on 27 Jan 2018 - 3:55

score 558 · Answer 5 · 2018-01-27 05:21:38

558

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Can the image and preimage of a function be the empty set?

Published on 27 Jan 2018 - 5:21

score 268 · Answer 6 · 2018-01-27 13:05:25

268

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Is infinitely small error the same as $0$ error?

Published on 27 Jan 2018 - 13:05

score 60 · Answer 7 · 2026-03-23 09:52:47

60

Views

Is there a simpler equation for this 2-d Analog to Coefficent of Variation?

Published on 23 Mar 2026 - 9:52

score 2.2k · Answer 8 · 2018-01-27 20:48:49

2.2k

Views

Why is it $|f(x) - L| < \epsilon$ in the definition for a limit and not $0 < |f(x) - L| < \epsilon$?

Published on 27 Jan 2018 - 20:48

score 10.1k · Answer 9 · 2026-03-22 21:03:36

10.1k

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Are functions considered continuous at endpoints?

Published on 22 Mar 2026 - 21:03

score 110 · Answer 10 · 2018-01-28 10:34:04

110

Views

Sensitive question on the definition of eigenvalues and eigenvectors

Published on 28 Jan 2018 - 10:34

score 56 · Answer 11 · 2018-01-28 12:49:42

56

Views

My own version of definition of eigenvalues and eigenvectors for matrices.

Published on 28 Jan 2018 - 12:49

score 1.8k · Answer 12 · 2018-01-29 04:39:19

1.8k

Views

Do discontinuities only exist strictly inside the domain of a function?

Published on 29 Jan 2018 - 4:39

score 42 · Answer 13 · 2018-01-29 12:46:59

42

Views

Why does $\mathbb{Z}/k\mathbb{Z}\cong\mathbb{Z}_{k}$ instead of homomorphism?

Published on 29 Jan 2018 - 12:46

score 2.2k · Answer 14 · 2018-01-29 14:37:42

2.2k

Views

How do we define the domain of a function with removable and nonremovable discontinuities?

Published on 29 Jan 2018 - 14:37

score 55 · Answer 15 · 2026-03-22 14:51:39

55

Views

Is my understanding of discontinuity correct?

Published on 22 Mar 2026 - 14:51

List Question

Confusion about the definition of positive definiteness

Do we discuss quadratic form of complex matrix?

Where am I making a mistake in showing that countability isn't a thing?

How to deal with extended real valued functions in optimization?

Can the image and preimage of a function be the empty set?

Is infinitely small error the same as $0$ error?

Is there a simpler equation for this 2-d Analog to Coefficent of Variation?

Why is it $|f(x) - L| < \epsilon$ in the definition for a limit and not $0 < |f(x) - L| < \epsilon$?

Are functions considered continuous at endpoints?

Sensitive question on the definition of eigenvalues and eigenvectors

My own version of definition of eigenvalues and eigenvectors for matrices.

Do discontinuities only exist strictly inside the domain of a function?

Why does $\mathbb{Z}/k\mathbb{Z}\cong\mathbb{Z}_{k}$ instead of homomorphism?

How do we define the domain of a function with removable and nonremovable discontinuities?

Is my understanding of discontinuity correct?

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