In the last decades, functional methods played an increasing role
in the qualita tive theory of partial differential equations. The
spectral methods and theory of C 0 semigroups of linear operators
as well as Leray-Schauder degree theory, ?xed point theorems, and
theory of maximal monotone nonlinear operators are now essential
functional tools for the treatment of linear and nonlinear boundary
value problems associated with partial differential equations. An
important step was the extension in the early seventies of the
nonlinear dy namics of accretive (dissipative) type of the
Hille-Yosida theory of C semigroups 0 of linear continuous
operators. The main achievement was that the Cauchy problem
associated with nonlinear m accretive operators in Banach spaces is
well posed and the corresponding dynamic is expressed by the Peano
exponential formula from ?nite dimensional theory. This fundamental
result is the corner stone of the whole existence theory of
nonlinear in?nite dynamics of dissipative type and its contri
bution to the development of the modern theory of nonlinear partial
differential equations cannot be underestimated.
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