1 paper
Genni Fragnelli, Gisèle Ruiz Goldstein, Jerome A. Goldstein +1
For S a positive selfadjoint operator on a Hilbert space, \[ \frac{d^2u}{dt}(t) + 2 F(S)\frac{du}{dt}(t) + S^2u(t)=0 \] describes a class of wave equations with strong friction o…