List questions from rational-numbers | MathQA

find all triplets of positive rationals satisfying this property

Published on 13 Jan 2023 - 8:02

Is there a formal approach to rounding of numbers?

Published on 11 Apr 2026 - 16:18

Is there a "rational-continuous" function that satisfies $f(f(x)) = 2x$?

Published on 22 Jan 2023 - 20:01

Find all rational numbers $r\in\mathbb{Q}$ s.t. $\cos(r\cdot\pi)$ is rational

Published on 23 Jan 2023 - 18:09

Existence of Function such that its Derivative is Zero for Rational Numbers and Nonzero for Irrational Numbers

Published on 12 Apr 2026 - 3:17

Proving order is well defined on $\mathbb{Q}$

Published on 26 Jan 2023 - 22:56

Finding subgroups and normal subgroups of a specific semidirect product

Published on 01 Apr 2026 - 17:46

Structure of subgroups of $A = \{ m2^n \mid m,n\in \mathbb{Z} \}$

Published on 29 Jan 2023 - 0:43