Set theory (A\C) \ (B\C) = (A\B)\C
13136
Element chasing proof that $(A\setminus C)\setminus(B\setminus C) = (A\setminus B)\setminus C$
56637
In naive set theory ∅ = {∅} = {{∅}}?
134770
For sets $A,B$, $A \cap (B \setminus A) \subseteq \varnothing$
67717
$A \oplus B = A \oplus C$ imply $B = C$?
39708
Proving $(A\le B)\vee (B\le A)$ for sets $A$ and $B$
3663
Finding counterexamples in elementary set theory.
144266
set theory proof of $A\cap B = A \setminus(A\setminus B)$
92376
Let $f:A \rightarrow B$ and C ⊂A. Define f[C]={b∈B: b=f(a) for some a∈C}. Prove or disprove each of the statement
2208
$\gcd(a,b,c)=\gcd(\gcd(a,b),c)\,$ [GCD Associative Law]
62770
Does $a\mid bc$ imply $a\mid b$ or $a\mid c$?
104068
Prove that $\forall a,b\in\mathbb{C} \exists c,d \in \mathbb{C}: c+d = a \land cd = b$
52451
Ordered Triples and Set Theory
64656
how do you prove that $A\times (B\setminus C) = (A\times B) \setminus (A\times C)$?
61747
Proof of exchange principle in set theory
1821
Proving $f(C) \setminus f(D) \subseteq f(C \setminus D)$ and disproving equality
141299
Alternative set theories
9158
Proving that a propositional theory of any cardinality has an independent set of axioms