List questions from functions

Published on 13 Apr 2026 - 14:58

78

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Counting the number of functions on a 4-element set whose composite with itself maps 1 to 2

Published on 16 Apr 2026 - 12:31

662

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Why does $x^2 = 0$ give a repeated root of $x=0,0$ instead of a single root of $x=0$.

Published on 14 Apr 2026 - 10:20

125

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Does there exists such a function?

Published on 14 Apr 2026 - 9:10

62

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Methods for finding some function $h$ with the property that, given two functions $f,g$, then $h\circ f=g\circ h$ is true?

Published on 13 Apr 2026 - 8:15

650

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restriction on the domain of composition of functions

Published on 25 Mar 2026 - 11:16

249

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Joint probability mass function maximum likelihood estimator

Published on 13 Apr 2026 - 12:20

102

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How to show that the element is not mapped to anything

Published on 09 Apr 2026 - 23:49

135

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What let's us do stuff like $F(a) = F(b)$ for $a=b$?

Published on 16 Apr 2026 - 14:47

68

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Dividing f(x) by zero.

Published on 13 Apr 2026 - 3:56

113

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Injective function from $\mathbb{R}^d \to \mathbb{R}$ that preserve relative distances

Published on 15 Apr 2026 - 7:37

57

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is it possible to find a close-form of this equation?

Published on 08 Apr 2026 - 20:38

579

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"Recursive definitions" in Tao's Analysis Vol I

Published on 14 Apr 2026 - 1:41

1.2k

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How to plot the domain of $f(x,y)=\sqrt {x+y}$?

Published on 15 Apr 2026 - 13:50

28

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Partial ordering between subsets of the naturals - or not?

Published on 14 Apr 2026 - 15:06

List Question

Function generating $n$ copies of $n$

Counting the number of functions on a 4-element set whose composite with itself maps 1 to 2

Why does $x^2 = 0$ give a repeated root of $x=0,0$ instead of a single root of $x=0$.

Does there exists such a function?

Methods for finding some function $h$ with the property that, given two functions $f,g$, then $h\circ f=g\circ h$ is true?

restriction on the domain of composition of functions

Joint probability mass function maximum likelihood estimator

How to show that the element is not mapped to anything

What let's us do stuff like $F(a) = F(b)$ for $a=b$?

Dividing f(x) by zero.

Injective function from $\mathbb{R}^d \to \mathbb{R}$ that preserve relative distances

is it possible to find a close-form of this equation?

"Recursive definitions" in Tao's Analysis Vol I

How to plot the domain of $f(x,y)=\sqrt {x+y}$?

Partial ordering between subsets of the naturals - or not?

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