List questions from functions

Published on 10 Apr 2026 - 8:35

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On Monotonicity

Published on 14 Apr 2026 - 10:31

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Intersection of inductive sets

Published on 22 Apr 2026 - 10:37

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A function in terms of another function

Published on 09 Apr 2026 - 3:38

30

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Solve $f(n,p)=y$ where $(n,p,y)\in\Bbb N\times\Bbb N\times\Bbb N$

Published on 15 Apr 2026 - 16:11

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Prove that $f(x)=\begin{cases}x& \text{if $x$ is rational},\\0 &\text{if $x$ is irrational}\end{cases}$ does not possess a derivative anywhere

Published on 15 Apr 2026 - 19:56

256

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Parametric Curve Derivative Formula Misunderstanding

Published on 13 Apr 2026 - 10:17

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Factorial of odds

Published on 16 Apr 2026 - 0:22

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Bijective Function from N to N x N

Published on 14 Apr 2026 - 12:09

56

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Is it true that $\{x\in \mathbb{R}: |1-f(x)|\leq 1-a\} = \{x\in \mathbb{R}: |f(x)|\geq a\}?$

Published on 13 Apr 2026 - 23:20

119

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If $\|f\|\leq 1,$ then is it true that $\{x\in\mathbb{R}: |1-f(x)|\leq 1-a\} = \{x\in\mathbb{R}: |f(x)|\geq a\}?$

Published on 16 Apr 2026 - 7:24

92

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Proving that a functional equation is constant

Published on 09 Apr 2026 - 10:51

134

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Do non-vanishing algebraic functions exist?

Published on 14 Apr 2026 - 16:01

79

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How to formalize the fact that $f(i)=\lceil i/2\rceil$ is surjective but not one-to-one from $\Bbb N$ to itself?

Published on 22 Apr 2026 - 15:55

54

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Bijective function N -> Q and N -> N x {1,...,n}

Published on 18 Apr 2026 - 13:19

List Question

functions and parameter

On Monotonicity

Intersection of inductive sets

A function in terms of another function

Solve $f(n,p)=y$ where $(n,p,y)\in\Bbb N\times\Bbb N\times\Bbb N$

Prove that $f(x)=\begin{cases}x& \text{if $x$ is rational},\\0 &\text{if $x$ is irrational}\end{cases}$ does not possess a derivative anywhere

Parametric Curve Derivative Formula Misunderstanding

Factorial of odds

Bijective Function from N to N x N

Is it true that $\{x\in \mathbb{R}: |1-f(x)|\leq 1-a\} = \{x\in \mathbb{R}: |f(x)|\geq a\}?$

If $\|f\|\leq 1,$ then is it true that $\{x\in\mathbb{R}: |1-f(x)|\leq 1-a\} = \{x\in\mathbb{R}: |f(x)|\geq a\}?$

Proving that a functional equation is constant

Do non-vanishing algebraic functions exist?

How to formalize the fact that $f(i)=\lceil i/2\rceil$ is surjective but not one-to-one from $\Bbb N$ to itself?

Bijective function N -> Q and N -> N x {1,...,n}

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