This book is about regularity properties of functional equations.
In the second part of his fifth problem, Hilbert asked, concerning
functional equations - in how far are the assertions which we can
make in the case of differentiable functions true under proper
modifications without this assumption? This book contains, in a
unified fashion, most of the modern results about regularity of
non-composite functional equations with several variables. These
results show that 'weak' regularity properties, say measurability
or continuity, of solutions imply that they are in C infinity], and
hence the equation can be reduced to a differential equation. A
long introduction highlights the basic ideas for beginners. Several
applications are also included.
General
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