This monograph is intended to present the fundamentals of the theory of
abstract parabolic evolution equations and to show how to apply to
various nonlinear dif- sion equations and systems arising in science.
The theory gives us a uni?ed and s- tematic treatment for concrete
nonlinear diffusion models. Three main approaches are known to the
abstract parabolic evolution equations, namely, the semigroup methods,
the variational methods, and the methods of using operational equations.
In order to keep the volume of the monograph in reasonable length, we
will focus on the semigroup methods. For other two approaches, see the
related references in Bibliography. The semigroup methods, which go back
to the invention of the analytic se- groups in the middle of the last
century, are characterized by precise formulas representing the
solutions of the Cauchy problem for evolution equations. The ?tA
analytic semigroup e generated by a linear operator ?A provides directly
a fundamental solution to the Cauchy problem for an autonomous linear e-
dU lution equation, +AU =F(t), 0