Explicit Observability Inequalities for the Wave Equation with Lower Order Terms by Means of Carleman Inequalities

Controllability (93B05) Initial-boundary value problems for second-order hyperbolic equations (35L20) PDEs in connection with optics and electromagnetic theory (35Q60) Observability (93B07) Wave equation (35L05) Continuation and prolongation of solutions to PDEs (35B60)

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