Question

What does the notation $\pi_n(X) = 0$ and $\pi_n(X) = 1$ mean for a homotopy group?

score 92 · Answer 1 · 2026-03-27 22:04:46

92

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What does the notation $\pi_n(X) = 0$ and $\pi_n(X) = 1$ mean for a homotopy group?

Published on 27 Mar 2026 - 22:04

score 137 · Answer 2 · 2026-03-25 06:30:47

137

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$\limsup_{n\rightarrow\infty}A_n = \cap_{n\geq1} \cup_{k\geq n}A_k$ is is the set of elements that belong to an infinity of $A_n$

Published on 25 Mar 2026 - 6:30

score 603 · Answer 3 · 2026-03-25 09:46:28

603

Views

A question on nowhere dense sets.

Published on 25 Mar 2026 - 9:46

score 1.4k · Answer 4 · 2026-03-27 16:54:12

1.4k

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Does symbol "$+$" denote an operation in the notation of a complex number: "$a+ib$"? In case it does, which operation does "$+$" denote?

Published on 27 Mar 2026 - 16:54

score 50 · Answer 5 · 2026-04-07 22:59:23

50

Views

If $f\in \mathbb{R}[X]$, then do only real numbers count as roots of $f$?

Published on 07 Apr 2026 - 22:59

score 521 · Answer 6 · 2026-03-29 18:34:27

521

Views

What are the pros/cons of the Natural numbers including 0?

Published on 29 Mar 2026 - 18:34

score 96 · Answer 7 · 2026-03-25 14:22:36

96

Views

Definition: Invariants of Hopf modules

Published on 25 Mar 2026 - 14:22

score 59 · Answer 8 · 2026-03-25 19:02:19

59

Views

Two interpretations of Chaos?

Published on 25 Mar 2026 - 19:02

score 321 · Answer 9 · 2026-04-01 12:58:31

321

Views

What's the difference between a Laplace functional and a Laplace transform?

Published on 01 Apr 2026 - 12:58

score 186 · Answer 10 · 2020-02-27 04:03:08

186

Views

What does it mean to say a function is "defined" on/over $[a, b]$, or "continuous" over $[a, b]$, has an "average value" on $[a, b]$, etc.?

Published on 27 Feb 2020 - 4:03

score 706 · Answer 11 · 2026-03-27 00:05:11

706

Views

Formal definition of differential equation, IVP and solution to an IVP

Published on 27 Mar 2026 - 0:05

score 181 · Answer 12 · 2026-03-28 15:26:54

181

Views

Just what is Mac Lane & Moerdijk's $\Lambda$ from $\S II.5$?

Published on 28 Mar 2026 - 15:26

score 133 · Answer 13 · 2026-03-25 22:06:13

133

Views

Definition and examples of orientations of $\Delta^n$ that are "the same" and "opposite"?

Published on 25 Mar 2026 - 22:06

score 245 · Answer 14 · 2026-03-25 11:33:45

245

Views

Motivation for the definition of the Pearson correlation coefficient

Published on 25 Mar 2026 - 11:33

score 165 · Answer 15 · 2026-03-28 05:59:58

165

Views

How are $\limsup_{x \to \infty}f(x)$ and $\liminf_{x \to \infty}f(x)$ defined?

Published on 28 Mar 2026 - 5:59

List Question

What does the notation $\pi_n(X) = 0$ and $\pi_n(X) = 1$ mean for a homotopy group?

$\limsup_{n\rightarrow\infty}A_n = \cap_{n\geq1} \cup_{k\geq n}A_k$ is is the set of elements that belong to an infinity of $A_n$

A question on nowhere dense sets.

Does symbol "$+$" denote an operation in the notation of a complex number: "$a+ib$"? In case it does, which operation does "$+$" denote?

If $f\in \mathbb{R}[X]$, then do only real numbers count as roots of $f$?

What are the pros/cons of the Natural numbers including 0?

Definition: Invariants of Hopf modules

Two interpretations of Chaos?

What's the difference between a Laplace functional and a Laplace transform?

What does it mean to say a function is "defined" on/over $[a, b]$, or "continuous" over $[a, b]$, has an "average value" on $[a, b]$, etc.?

Formal definition of differential equation, IVP and solution to an IVP

Just what is Mac Lane & Moerdijk's $\Lambda$ from $\S II.5$?

Definition and examples of orientations of $\Delta^n$ that are "the same" and "opposite"?

Motivation for the definition of the Pearson correlation coefficient

How are $\limsup_{x \to \infty}f(x)$ and $\liminf_{x \to \infty}f(x)$ defined?

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