New posts in Vector Spaces

Is there a semi-norm that respects matrix similitary?

Example of infinite dimensional linear spaces where the space is equal to its dual.

Hilbert space basis which is not a vector space basis

Does zero curl imply a conservative field?

A Field of Polynomials of a Linear Operator

Justify that the vectors are linearly dependent

Is a linear vector space a vector space?

Does Cauchy-Schwarz Inequality depend on positive definiteness?

Does the definition of the linear span of a subset of a vector space require that the set be countable?

Is $M=\{p\in \mathcal P^3: p(x)=p(x-1), \forall x \in \Bbb R\}$ subspace of $\mathcal P^3$ and if it is, find it's basis.