List questions from rational-numbers

Published on 13 Sep 2018 - 3:54

41

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Question about the validity of a group of rational numbers

Published on 14 Sep 2018 - 6:28

242

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Proof for rationality of a number

Published on 16 Sep 2018 - 13:48

1.3k

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Prime and rational numbers

Published on 17 Sep 2018 - 1:14

459

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Tensor product of finite group with group of rational number.

Published on 22 Sep 2018 - 6:38

135

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A linear form can not be too small on integer points

Published on 25 Mar 2026 - 11:17

84

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What is this intersection of dense open sets?

Published on 27 Sep 2018 - 18:26

101

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Finding a minima for a linear form with integer coefficients

Published on 25 Mar 2026 - 11:17

185

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If $a$ is rational and $18a$ and $25a$ integers then so is $a$. Same for any coprime multipliers. Denominators closed under gcd.

Published on 28 Sep 2018 - 10:38

102

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Vector field in $\Bbb Q^2$ and $\Bbb R^2$

Published on 29 Sep 2018 - 23:09

812

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Is $[0,1] ∩ Q$ open or closed in real numbers?

Published on 30 Sep 2018 - 15:11

224

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Is there a well-behaved finitely additive “measure” on $\mathbb{Q }$?

Published on 30 Sep 2018 - 23:46

38

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Two whole numbers n and k . Print k decimal digits of 1 / n .

Published on 25 Mar 2026 - 6:06

78

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Checking for rational numbers with small denominators in an interval

Published on 07 Oct 2018 - 4:07

56

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When is the denominator of the sum of two positive fractions not divisible by the denominator of either numbers?

Published on 07 Oct 2018 - 6:57

List Question

Can you multiply a rational by an irrational and get a rational number?

Question about the validity of a group of rational numbers

Proof for rationality of a number

Prime and rational numbers

Tensor product of finite group with group of rational number.

A linear form can not be too small on integer points

What is this intersection of dense open sets?

Finding a minima for a linear form with integer coefficients

If $a$ is rational and $18a$ and $25a$ integers then so is $a$. Same for any coprime multipliers. Denominators closed under gcd.

Vector field in $\Bbb Q^2$ and $\Bbb R^2$

Is $[0,1] ∩ Q$ open or closed in real numbers?

Is there a well-behaved finitely additive “measure” on $\mathbb{Q }$?

Two whole numbers n and k . Print k decimal digits of 1 / n .

Checking for rational numbers with small denominators in an interval

When is the denominator of the sum of two positive fractions not divisible by the denominator of either numbers?

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