Wave equations with time-dependent coefficients
نویسندگان
چکیده
We study the damped wave equation with time-dependent coefficients utt(t, x) − a(t) 2 ∆u(t, x) − b ′ b (t)ut(t, x) = 0 in R n and prove energy estimates for a new class of coefficients.
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تاریخ انتشار 2007