Prove that the volume of the tetrahedron whose coterminus edges are $\vec{a},\vec{b},\vec{c}$ is given by $\frac{1}{6}\vec{a}.(\vec{b}\times\vec{c})$
141405
Drawing a tetrahedron from a parellelepiped to convince myself it is 1/6th the volume,
120094
Prove, that for any A, B, C sets, $A\times (B\setminus C) = (A\times B)\setminus (A\times C)$ is true.
61103
Prove that $\mathbb{|Q| = |Q\times Q|}$
15586
Volume of the torus with an integral
90618
Color the edges of $K_6$ red or blue. Prove that there is a cycle of length 4 with monochromatic edges.
82309
Volume of a solid created by an extended tetrahedron
126428
Prove the edges of a multigraph may be oriented such that the net-degree of any vertex is $\leq 1$.
13899
Proof that $-v = (-1)*v$
70164
Proof exercise that the cardinal number of a set in $\mathbb R^2$ is $\frak c$
150738
Proof of $(A - B) - C = A - (B \cup C)$
135779
Prove the following: If $a \mid bc$, then $a \mid \gcd(a, b)c$.
104258
Proof Verification: $\dim\mathrm{Im} T+\dim\ker T=\dim V$
94383
Prove that $A^TD-C^TB=I$
67887
Prove that a graph on $n$ vertices with girth $g$ has at most $\frac{g}{g-2}(n-2)$ edges
77969
Question about proof for $S_4 \cong V_4 \rtimes S_3$
6161
The cartesian product $\mathbb{N} \times \mathbb{N}$ is countable
6335
Proving that the set enclosed by an ellipse is convex