A,B Sets injective map A into B or bijection subset A onto B
39708
Proving $(A\le B)\vee (B\le A)$ for sets $A$ and $B$
44689
Explicit bijection between $[0,1)$ and $(0,1)$
83714
$A \in B$ vs. $A \subset B$ for proofs
63267
Under what conditions on the sets $A$ and $B$ will it be true that $A\times B= B\times A$
151852
How to prove $A \subset B \iff A \cup B = B$
53168
Surjective, Injective, Bijective Functions from $\mathbb Z$ to itself
128966
Explicit bijection between $\Bbb R$ and permutations of $\Bbb N$
13132
If the union of two sets is contained in the intersection, then one is contained in the other ($[A\cup B\subseteq A\cap B]\implies A \subseteq B$)
64583
Number of surjective functions from A to B
27188
Bijection between $\mathbb{R}$ and $\mathbb{R}/\mathbb{Q}$
20303
A function $f\colon E\to F$ between finite sets is injective iff it is surjective iff it is bijective
64140
Find a bijection from $\mathbb R$ to $\mathbb R-\mathbb N$
37951
proof detail concerning bijection between a set and its power set
115999
Is there always an injective map from a space in its dual space?
133699
Proving that there is a bijection between $A$ and $B$.
41359
Constructing a bijection
53101
Is it true that the relation |A| < |B| is a sufficient condition for claiming that $f$ is a bijection?