Cross Product of two sets A and $\varnothing$
125161
Why is the Cartesian product of $A$ and $\varnothing$ empty?
90434
Prove for every two sets $A$ and $B$ that $A-B$, ${B-A}$ and $A \cap B$ are pairwise disjoint.
63267
Under what conditions on the sets $A$ and $B$ will it be true that $A\times B= B\times A$
3392
Sum of products of elements of nonempty subsets of A set
28819
A union of two subspaces not equal to the vector space.
111032
Proof of Sets involving the Cartesian Product
106756
Union and Intersection of Sets $A_{i}$ and $B_{j}$
41347
The dimension of the intersection of two vector subspaces
104274
Express $C$ interms of the sets $A_n$
68918
Show that $A\cap B\subseteq A$ and $A\subseteq A\cup B$
64861
Intersection of open affines can be covered by open sets distinguished in *both*affines
41044
Equivalence of $a \rightarrow b$ and $\lnot a \vee b$
80916
How to prove that if $A\subseteq A\times A$, then $A=\varnothing$?
12459
Associativity of symmetric difference of sets
132487
Proving that if $V$ is an inner product space and $U_1, U_2$ are subsets, then $U_1 \subset U_2$ if and only if $U^{\perp}_2 \subset U^{\perp}_1$
44685
Inner product on $C(\mathbb R)$
14711
set theoretic function, products of sets (product versus Cartesian product)