Symmetric difference involving three sets: $A\triangle B\triangle C$
12459
Associativity of symmetric difference of sets
9850
How many ways are there to choose 3 subsets $A,B,C$ of a set $\{1,2,3...n\}$ such that $ A \cap B \cap C = \emptyset $
33633
Re:$ (a,b,c,d)=(pr+qs, qr-ps,pr-qs,ps+qr) $
151038
How to prove (A v B), (A → C), (B → D) therefore (C v D)
118239
If $A, B, C$ are sets prove that $(A\setminus B)\setminus C\subseteq A\setminus(B\setminus C)$
30044
Inequality with triangle sides
50417
Prove that the triangles $ABC$ and $AB^{'}C^{'}$ have the same incentre.
32912
Getting the difference between two sets
150528
Pythagorean triples $(a,b,c)$ and divisibility of $a$ or $b$ by $3$.
21229
If an element is not in the set difference $A\setminus B \: \:?$
18800
If A and B are symmetric is AB=BA true?
79
Find $a$, $b$ and $c$ that satisfy the following equations
111003
Prove that if $A\triangle B = C\triangle B$, then $A = C$
113083
How to prove a set equality?
64586
How to prove that $\neg((A\cap B)\cup (\neg A \cap C)) = (A\cap\neg B)\cup (\neg A\cap \neg C)$
61538
Given a square matrix $A$, both $AA^T$ and $A^TA$ are symmetric
38807
Does set difference distribute over set intersection?