Hongler, M. O.Streit, L.2013-01-072013-01-072013-01-07199010.1016/0378-4371(90)90191-T2-s2.0-0005787499https://infoscience.epfl.ch/handle/20.500.14299/87647WOS:A1990DJ33500003The possibility of using generalized telegrapher's equations (GTEs) to describe the time evolution of probability densities of non-Markovian stochastic processes is consedered. The solutions of hyperbolic equations of the type of GTE being generally not positive definite, we derive conditions for which this global property if fulfilled. © 1990.text::journal::journal article::research article