Question

Check if point is inside a circular cone in rational^3 domain.

score 224 · Answer 1 · 2026-04-11 03:23:45

224

Views

Check if point is inside a circular cone in rational^3 domain.

Published on 11 Apr 2026 - 3:23

score 85 · Answer 2 · 2022-08-27 05:53:06

85

Views

Is the function $f$ from the set of rationals to the set of integers such that $f(a/b) = a$ well-defined?

Published on 27 Aug 2022 - 5:53

score 128 · Answer 3 · 2026-04-07 21:20:44

128

Views

Show there exists a rational number between every two real numbers, using rational Cauchy sequence

Published on 07 Apr 2026 - 21:20

score 55 · Answer 4 · 2022-08-30 15:42:57

55

Views

Tweaking the sum of two real numbers so that each term has a common divisor

Published on 30 Aug 2022 - 15:42

score 64 · Answer 5 · 2026-04-01 08:04:13

64

Views

Homeomorphism of $\Bbb R$ sending $\Bbb N$ to $\Bbb Q$

Published on 01 Apr 2026 - 8:04

score 116 · Answer 6 · 2022-08-31 09:53:13

116

Views

Spectral Theorem version for $ \mathbb{Q}$ or field with characteristic $0$ in general?

Published on 31 Aug 2022 - 9:53

score 115 · Answer 7 · 2026-04-09 07:52:54

115

Views

Is it valid to write irrational number written as an infinite sum of rational number?

Published on 09 Apr 2026 - 7:52

score 125 · Answer 8 · 2022-09-12 11:46:59

125

Views

Easy algebraic construction of $\overline{\mathbb Q}$?

Published on 12 Sep 2022 - 11:46

score 45 · Answer 9 · 2026-04-09 07:59:47

45

Views

Why is the sum of (at least some) infinite series irrational when the set of rational numbers is closed w/respect to + - * and /

Published on 09 Apr 2026 - 7:59

score 84 · Answer 10 · 2022-09-17 22:22:54

84

Views

show that $0, 10100100010000100000 · · · \notin \mathbb{Q}$

Published on 17 Sep 2022 - 22:22

score 49 · Answer 11 · 2026-04-01 01:05:32

49

Views

In a regular n-gon with $n>4$, side length $1$ and all diagonals drawn, can any cell have rational area?

Published on 01 Apr 2026 - 1:05

score 75 · Answer 12 · 2026-04-10 04:12:51

75

Views

Computational Game Theory, Why aren't Nash Equilibrium calculated with rational numbers instead of floating point numbers?

Published on 10 Apr 2026 - 4:12

score 155 · Answer 13 · 2022-09-23 09:38:01

155

Views

Prove that $\mathbb{Q}$ is not closed

Published on 23 Sep 2022 - 9:38

score 180 · Answer 14 · 2026-04-04 17:41:28

180

Views

Show that every two consecutive rationals in any row of this infinite tree of Calkin-Wilf trees are the endpoints of a "kite".

Published on 04 Apr 2026 - 17:41

score 373 · Answer 15 · 2026-04-09 07:52:14

373

Views

Give an example of a function $h:\mathbb{R}\backslash\mathbb{Q}\rightarrow\ \mathbb{Q}$

Published on 09 Apr 2026 - 7:52

List Question

Check if point is inside a circular cone in rational^3 domain.

Is the function $f$ from the set of rationals to the set of integers such that $f(a/b) = a$ well-defined?

Show there exists a rational number between every two real numbers, using rational Cauchy sequence

Tweaking the sum of two real numbers so that each term has a common divisor

Homeomorphism of $\Bbb R$ sending $\Bbb N$ to $\Bbb Q$

Spectral Theorem version for $ \mathbb{Q}$ or field with characteristic $0$ in general?

Is it valid to write irrational number written as an infinite sum of rational number?

Easy algebraic construction of $\overline{\mathbb Q}$?

Why is the sum of (at least some) infinite series irrational when the set of rational numbers is closed w/respect to + - * and /

show that $0, 10100100010000100000 · · · \notin \mathbb{Q}$

In a regular n-gon with $n>4$, side length $1$ and all diagonals drawn, can any cell have rational area?

Computational Game Theory, Why aren't Nash Equilibrium calculated with rational numbers instead of floating point numbers?

Prove that $\mathbb{Q}$ is not closed

Show that every two consecutive rationals in any row of this infinite tree of Calkin-Wilf trees are the endpoints of a "kite".

Give an example of a function $h:\mathbb{R}\backslash\mathbb{Q}\rightarrow\ \mathbb{Q}$

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