  In this thesis we consider so-called linear evolutionary problems, a class of
linear partial differential equations covering classical elliptic, parabolic
and hyperbolic equations from mathematical physics as well as classes of
integro-differenital equations, fractional differential equations and delay
equations. We address the well-posedness of the problems in a pure Hilbert
space setting. Moreover, the exponential stability and the regularity of the
problems are studied. In particular, a Hille-Yosida type result is proved, to
obtain a strongly continuous semigroup on a suitable state space consisting of
admissible initial values and pre-histories. The results are illustrated by
various examples.
