Question

Maximal cardinality of a subset

score 56 · Answer 1 · 2020-04-12 12:19:28

56

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Maximal cardinality of a subset

Published on 12 Apr 2020 - 12:19

score 106 · Answer 2 · 2020-04-12 16:25:14

106

Views

$\mathbb{Q}$ dense in $\mathbb{R}$ does also $\mathbb{Q^2}$ dense in $\mathbb{R^2}$?

Published on 12 Apr 2020 - 16:25

score 153 · Answer 3 · 2020-04-15 08:44:50

153

Views

Express one-third as a dyadic number

Published on 15 Apr 2020 - 8:44

score 131 · Answer 4 · 2026-03-30 01:51:41

131

Views

Is the polynomial $4x^3 - 3x - 1/2 $ irreducible over $\mathbb{Q}$?

Published on 30 Mar 2026 - 1:51

score 86 · Answer 5 · 2020-04-17 07:53:39

86

Views

Is there a method to figure out how many decimal places there are for a recurring decimal?

Published on 17 Apr 2020 - 7:53

score 44 · Answer 6 · 2020-04-19 19:43:53

44

Views

Show that a product lies in $(\mathbb{Q}^*)^2$

Published on 19 Apr 2020 - 19:43

score 159 · Answer 7 · 2026-03-28 09:34:17

159

Views

Compute the kernel of the group hom $\Omega : \Bbb{Q}^{\times} \to \Bbb{Z}^+$.

Published on 28 Mar 2026 - 9:34

score 56 · Answer 8 · 2026-03-26 20:40:38

56

Views

Interesting examples of $Q$-fiber bundles

Published on 26 Mar 2026 - 20:40

score 104 · Answer 9 · 2026-03-30 10:11:05

104

Views

find all continuous function such that $f(a)-f(b)$ is rational iff $a-b$ is rational

Published on 30 Mar 2026 - 10:11

score 110 · Answer 10 · 2026-03-30 10:25:26

110

Views

Countable Subset of rational numbers

Published on 30 Mar 2026 - 10:25

score 57 · Answer 11 · 2020-04-27 19:16:02

57

Views

Proving that a function $q:\mathbb{N}\to\mathbb{Q}$ is surjective

Published on 27 Apr 2020 - 19:16

score 84 · Answer 12 · 2026-03-26 11:03:38

84

Views

Is there any numerical representation in which each rational has only one representation?

Published on 26 Mar 2026 - 11:03

score 40 · Answer 13 · 2020-04-28 07:58:08

40

Views

How can I prove (or state that this statement is wrong) "For any real number $x$, if $x < x$ then $x$ is a rational number."

Published on 28 Apr 2020 - 7:58

score 8.2k · Answer 14 · 2020-04-29 15:48:48

8.2k

Views

"Gaps" or "holes" in rational number system

Published on 29 Apr 2020 - 15:48

score 38 · Answer 15 · 2026-03-26 03:12:28

38

Views

How would one notate the subset of the rationals with terminating decimal expansions?

Published on 26 Mar 2026 - 3:12

List Question

Maximal cardinality of a subset

$\mathbb{Q}$ dense in $\mathbb{R}$ does also $\mathbb{Q^2}$ dense in $\mathbb{R^2}$?

Express one-third as a dyadic number

Is the polynomial $4x^3 - 3x - 1/2 $ irreducible over $\mathbb{Q}$?

Is there a method to figure out how many decimal places there are for a recurring decimal?

Show that a product lies in $(\mathbb{Q}^*)^2$

Compute the kernel of the group hom $\Omega : \Bbb{Q}^{\times} \to \Bbb{Z}^+$.

Interesting examples of $Q$-fiber bundles

find all continuous function such that $f(a)-f(b)$ is rational iff $a-b$ is rational

Countable Subset of rational numbers

Proving that a function $q:\mathbb{N}\to\mathbb{Q}$ is surjective

Is there any numerical representation in which each rational has only one representation?

How can I prove (or state that this statement is wrong) "For any real number $x$, if $x < x$ then $x$ is a rational number."

"Gaps" or "holes" in rational number system

How would one notate the subset of the rationals with terminating decimal expansions?

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