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Proof of Theorem of solution of wave equation in the case $n = 1$

Solution of Brezis Problem 8.24 (1) and (2)

Solution of Evans PDE Problem 13

A lemma of J. L. Lions

Complex Hahn-Banach Theorem

Real Hahn-Banach Theorem

Riesz Representation Theorem

The application of Hahn-Banach Theorem 01

The application of Hahn-Banach Theorem 02