  We prove the uniqueness of weak solutions to the critical defocusing wave
equation in 3D under a local energy inequality condition. More precisely, we
prove the uniqueness of $ u \in L^\infty\_t(\dot{H}^{1})\cap
\dot{W}^{1,\infty}\_t(L^2)$, under the condition that $u$ verifies some local
energy inequalities.
