Vector subspace of a normed space
117575
Every proper subspace of a normed vector space has empty interior
65840
Norm induced by metric
19415
Proof that every finite dimensional normed vector space is complete
4151
Every subspace of a vector space has a complement
18195
Understanding of the theorem that all norms are equivalent in finite dimensional vector spaces
14429
dimension of a subspace spanned by two subspaces
65494
Proper subspaces of $ R^n $
53850
Proof that every normed vector space is a topological vector space
51177
When are two norms equivalent on a Banach space?
15839
equivalent norms in Banach spaces of infinite dimension
154226
Upper bound for norm of Hilbert space operator
144112
Show that $c_0$ is a Banach space with the norm $\rVert \cdot \lVert_\infty$
69893
An inner product space and its proper closed subspace with trivial orthogonal complement
138653
Is $\mathbb{R}$ a subspace of $\mathbb{R}^2$?
125073
Finite-dimensional subspaces of normed vector spaces are direct summands
137769
How to find a basis for a subspace?
74465
One-dimensional vector space and it's subspaces