Vector subtraction proof
3820
Prove that $||x|-|y||\le |x-y|$
13899
Proof that $-v = (-1)*v$
105367
Proving $||\vec{a}+\vec{b}|| = ||\vec{a}-\vec{b}|| \iff \vec{a} \perp \vec{b}$
156877
Rank-one perturbation proof
41520
Prove that $L(V,W)$ forms a vector space
138342
Proof of a matrix exponential identity
152932
Proof: $\det\pmatrix{\langle v_i , v_j \rangle}\neq0$ $\iff \{v_1,\dots,v_n\}~\text{l.i.}$
83970
Proof of an elementary property of Projection Operators
3433
Proof if $a \vec v = 0$ then $a = 0$ or $\vec v = 0$
137873
Problems that involves two facts in the definition of vector spaces
145900
Proof of a double summation reduction identity
146033
Intuitive Proof of the Chain Rule in 1 Variable
127380
Use vectors to prove $\cos(\beta - \alpha) = \cos \alpha \cos\beta + \sin\alpha \sin\beta$
61666
Proving $ [(\vec{a}+\vec{b})\times(\vec{b}+\vec{c})]\cdot(\vec{c}+\vec{a})=2\vec{c}\cdot(\vec{b}\times\vec{a})$
116823
VERIFYING: Proving an $n \times n$ Matrix Vector Space
72157
Elementary proof of tangent half angle formula
140768
Proof of Vandermonde Matrix Inverse Formula