Explanation of composition of two onto functions?
130363
Prove composition of two surjections is surjection
84317
Iterated self-composition of arbitrary function
42579
Composition of 2 involutions
21707
Constructing a Bijective function via an injective and surjective one.
143849
How to define mathematical functions by the action on an element?
57938
When do two functions become equal?
133083
Injectivity and surjectivity of a recursive function
103378
What is a composition of two binary relations geometrically?
98271
Why does $(x \to a) ≠ (x = a)$ , But $f(x \to a) = f(x = a)$
151947
Finding a pair of functions with properties
100283
How to understand the notion of a differential of a function
102620
Confusion about the definition of function
101773
Let $g : A \to B$ and $f : B \to C$ be functions. Let $f \circ g$ be onto. Are both $f$ and $g$ necessarily onto?
133498
Show that Function Compositions Are Associative
82448
Why is $f(x) = x\phi(x)$ one-to-one?
103045
Composition of Proximal Operators
44285
What does this notation mean? F|U