set theory proof (cartesian products/symmetric differences)
25553
elementary set theory (cartesian product and symmetric difference proof)
112084
Proof of a formula for the power set of a union of two sets
39708
Proving $(A\le B)\vee (B\le A)$ for sets $A$ and $B$
126633
Is a contradiction enough to prove a set equality to $\varnothing$?
64656
how do you prove that $A\times (B\setminus C) = (A\times B) \setminus (A\times C)$?
33524
Prove the following $A \setminus (B\setminus C) = (A\setminus B)\cap (A \cup C)$
102383
Associativity of Cartesian Product
37331
Prove that every set with more than one element has a permutation without fixed points
103463
Mantel's Theorem proof verification
6161
The cartesian product $\mathbb{N} \times \mathbb{N}$ is countable
107383
Derived sets - prove $(A \cup B)' = A' \cup B'$
9651
Cardinality of cartesian product of an infinite set with N
29303
Cartesian product of compact sets is compact
125161
Why is the Cartesian product of $A$ and $\varnothing$ empty?
71653
Why is the Cartesian product of a set $A$ and empty set an empty set?
41726
Musical and combinatorial proof
61747
Proof of exchange principle in set theory