Question

Is infinity part of the boundary of R^n?

score 779 · Answer 1 · 2026-04-12 16:57:16

779

Views

Is infinity part of the boundary of R^n?

Published on 12 Apr 2026 - 16:57

score 595 · Answer 2 · 2026-04-13 18:04:40

595

Views

Does there exist an interval on the reals, however small, in which every number is irrational?

Published on 13 Apr 2026 - 18:04

score 79 · Answer 3 · 2026-04-13 16:08:16

79

Views

What is $(-1)^\infty$, or $(-1)^x$ as the limit of $x$ approaches infinity?

Published on 13 Apr 2026 - 16:08

score 67 · Answer 4 · 2026-04-12 14:11:22

67

Views

A wrong definition of infinity and a doubt about its modification

Published on 12 Apr 2026 - 14:11

score 1.1k · Answer 5 · 2026-04-15 22:27:30

1.1k

Views

Suppose $X$ is infinite and $A$ is a finite subset of $X$. Then $X$ and $X \setminus A$ are equinumerous

Published on 15 Apr 2026 - 22:27

score 115 · Answer 6 · 2026-05-11 00:49:58

115

Views

Backwards Zeno's Paradox

Published on 11 May 2026 - 0:49

score 1.7k · Answer 7 · 2026-04-13 02:09:56

1.7k

Views

Precise meaning of infinitely many

Published on 13 Apr 2026 - 2:09

score 435 · Answer 8 · 2026-04-16 08:57:14

435

Views

Let $X$ be uncountable and $A$ be a countable subset of $X$. Then $X$ and $X \setminus A$ are equinumerous

Published on 16 Apr 2026 - 8:57

score 265 · Answer 9 · 2026-05-10 14:50:22

265

Views

An infinite division and balls problem

Published on 10 May 2026 - 14:50

score 571 · Answer 10 · 2026-04-16 02:38:36

571

Views

The limit of $\frac{n^3-3}{2n^2+n-1}$

Published on 16 Apr 2026 - 2:38

score 275 · Answer 11 · 2026-04-15 23:20:31

275

Views

Suppose $X$ is infinite and $A$ is a finite subset of $X$. Then $X$ and $X\setminus A$ are equinumerous

Published on 15 Apr 2026 - 23:20

score 139 · Answer 12 · 2026-04-17 15:47:08

139

Views

Let $X$ be infinite. Then $X$ and $X\times\Bbb N$ are equinumerous

Published on 17 Apr 2026 - 15:47

score 441 · Answer 13 · 2026-05-10 18:05:39

441

Views

Why Hilbert changes the property of a set in his Infinite hotel?

Published on 10 May 2026 - 18:05

score 637 · Answer 14 · 2026-04-16 12:07:38

637

Views

If $X$ is infinite, then $X$ and $X\times X$ are equinumerous

Published on 16 Apr 2026 - 12:07

score 534 · Answer 15 · 2026-04-16 23:13:00

534

Views

Partition an infinite set into countable sets

Published on 16 Apr 2026 - 23:13

List Question

Is infinity part of the boundary of R^n?

Does there exist an interval on the reals, however small, in which every number is irrational?

What is $(-1)^\infty$, or $(-1)^x$ as the limit of $x$ approaches infinity?

A wrong definition of infinity and a doubt about its modification

Suppose $X$ is infinite and $A$ is a finite subset of $X$. Then $X$ and $X \setminus A$ are equinumerous

Backwards Zeno's Paradox

Precise meaning of infinitely many

Let $X$ be uncountable and $A$ be a countable subset of $X$. Then $X$ and $X \setminus A$ are equinumerous

An infinite division and balls problem

The limit of $\frac{n^3-3}{2n^2+n-1}$

Suppose $X$ is infinite and $A$ is a finite subset of $X$. Then $X$ and $X\setminus A$ are equinumerous

Let $X$ be infinite. Then $X$ and $X\times\Bbb N$ are equinumerous

Why Hilbert changes the property of a set in his Infinite hotel?

If $X$ is infinite, then $X$ and $X\times X$ are equinumerous

Partition an infinite set into countable sets

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