Definition:Quasinormed Vector Space
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Definition
Let $\struct {R, +, \circ}$ be a division ring with norm $\norm {\,\cdot\,}_R$.
Let $V$ be a vector space over $R$.
Let $\norm \cdot$ be a quasinorm on $V$.
Then we say that $\struct {V, \norm \cdot}$ is a quasinormed vector space.