Q1. Does every vector space V (over R or C) have an inner product? (Finite dimensional ones do, of course.)
Q2. There are vector spaces V that have a norm ||x|| that cannot arise from any inner product < , > in the sense that <x,x> = ||x||^2 for all x. Example? #math #algebra
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In R^n, all norms are equivalent (ie give the same topology) so the inner product would give the same topology as any other norms on R^n.
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might be different in infinite dimensional vector spaces. Take L1[0,1]. The L1 and L2 norms aren’t equivalent.
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