Proving $(A \times C) \cup (B \times D) \subset (A \cup B) \times (C \cup D)$
140440
Proving $(A\times C)\cup(B\times D)\subseteq(A\cup B)\times(C\cup D)$
60707
Show that if $ \ A \cup B = A$ and $ \ A\cap B = A$ then $ \ A = B$
116527
Validating a proof for necessary and sufficient conditions on sets A & B such that $P(A) \cup P(B) = P(A\cup B)$
140668
Union of $2$ set $A, B$ where $ A$ is a subset of $B$
33524
Prove the following $A \setminus (B\setminus C) = (A\setminus B)\cap (A \cup C)$
13167
Prove $A = (A \setminus B) \cup (A \cap B)$
145058
Prove $ (A \cup B) \cap C$ = $(A \cap C) \cup (B \cap C) $
77286
Proving set theory question
38428
How tot start proving $A \times B \times C \ne (A \times B) \times C$?
103441
Proving $(A\cup B)\cap(B\cup C)\cap(C\cup A)=(A\cap B)\cup (A\cap C)\cup (B\cap C)$?
64586
How to prove that $\neg((A\cap B)\cup (\neg A \cap C)) = (A\cap\neg B)\cup (\neg A\cap \neg C)$
151295
Proving $|S \times \mathbb{N}|=|S|$ when $S$ is an infinite set
83714
$A \in B$ vs. $A \subset B$ for proofs
38200
Show that $(\mathbf{a}·\mathbf{a})(\mathbf{b}·\mathbf{b})-(\mathbf{a}·\mathbf{b})^2=(\mathbf{a}\times\mathbf{b})·(\mathbf{a}\times\mathbf{b})$?
70278
$A\subseteq B\to C\setminus B\subseteq C\setminus A\,$ -- how to prove this?
75604
Proof that $\partial(A\times B) = ((\partial A)\times B)\cup (A\times(\partial B))$
63267
Under what conditions on the sets $A$ and $B$ will it be true that $A\times B= B\times A$