A Generalization of the Hahn-Banach Theorem
Robin E. Harte · Journal of the London Mathematical Society · 1965
Let K denote either the real field R of the complex field C. The Hahn-Banach theorem can be stated in the following form: THEOREM 0. Let E be a vector space over the field K, and q: Es>R a seminorm on E. Then, for each vector subspace EQ of E, and each linear