Normed Division Algebras: Why those dimensions?
43131
Why is 8 so special?
114609
Does the Banach algebra $L^1(\mathbb{R})$ have zero divisors?
150287
Spectral radii and norms of similar elements in a C*-algebra: $\|bab^{-1}\|<1$ if $b=(\sum_{n=0}^\infty (a^*)^n a^n)^{1/2}$
98949
Subspaces and annihilators
144211
a second course in abstract algebra
145390
Formal power series ring, norm.
18373
Can infinite-dimensional vector spaces be decomposed into direct sum of its subspaces?
19415
Proof that every finite dimensional normed vector space is complete
111911
Dimensions of symmetric and skew-symmetric matrices
121047
Proof: Sum of dimension of orthogonal complement and vector subspace
49984
Valid justification for algebraic manipulation of $\mathrm{d}y/\mathrm{d}x$?
40858
Multiplicative nature of the separability degree
155120
Why are the only division algebras over the real numbers the real numbers, the complex numbers, and the quaternions?
99350
Are two norms equivalent if they induce the same topology on a vector space?
43503
Bases of complex vector spaces and the axiom of choice
138944
Is $\mathbb Z[\sqrt{-3}]$ Euclidean under some other norm?
117476
Isometries between dual factor space and annihilator