Projection on the hyperplane H: $∑x_i=k$
67106
Projection on the hyperplane $H: \sum x_i=0$
2174
Proving that HK is a subgroup when K is normal
120766
Prove ${y_n}$ is a basis for a Hilbert space $H$.
47975
Closed cone in the euclidean space $\mathbb{R}^n$
123505
how to prove vector norm equivalence in finite dimensional space($\mathbb{R}^{n}$)?
88184
Finding the value of $k$ for parallel/orthogonal planes
65888
A counterexample to theorem about orthogonal projection
37060
The Parallelogram Identity for an inner product space
127025
Diagonalization of a projection
66895
A condition for the image of a metrizable space to be metrizable
81196
Is true that $H^{s,p}(\mathbb{R}^n)\subset C^k(\mathbb{R}^n)$ when $s-k>n/p$?.
144382
Proving $\lVert x \rVert_3$ is smaller than euclidean norm
146839
Orthogonal Projection onto the $ {L}_{\infty} $ Unit Ball
49087
Show that a norm on an inner product space satisfies parallelogram law.
124786
Prove that V contains a subspace of each dimension
34712
Decomposable elements of $\Lambda^k(V)$
55968
Expression of the Hyperbolic Distance in the Upper Half Plane