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Stability of Functional Equations in Banach Algebras
The main purpose of this book is to present some of the old and recent results
on homomorphisms and derivations in Banach algebras, quasi-Banach algebras,
C-algebras, C-ternary algebras, non-Archimedean Banach algebras, and multinormed algebras.
In 1940, S. M. Ulam [321] proposed a stability problem on group homomorphisms in metric groups. In 1941, D. H. Hyers [133] proved the stability of additive
mappings in Banach spaces associated with the Cauchy equation. In 1978, Th. M.
Rassias [267] proved the stability of R-linear mappings associated with the Cauchy
equation, and in 2002 C. Park [220] proved the stability of C-linear mappings
in the spirit of Hyers, Ulam, and Rassias in Banach modules. Homomorphisms
and derivations in Banach algebras, quasi-Banach algebras, C-algebras, C-
ternary algebras, non-Archimedean Banach algebras and multi-normed algebras
are additive and R-linear or C-linear, and so we study the stability problems for
additive functional equations and additive mappings. Using the direct method and
the fixed point method, the authors have studied the stability and the superstability
of homomorphisms and derivations in Banach algebras, quasi-Banach algebras,
C-algebras, C-ternary algebras, non-Archimedean Banach algebras, and multinormed algebras, which are also associated with additive functional equations and
additive functional inequalities.
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