Solution of several functional equations on nonunital semigroups using Wilson's functional equations with involution

J Chung, PK Sahoo - Abstract and Applied Analysis, 2014 - Wiley Online Library
Let S be a nonunital commutative semigroup, σ: S→ S an involution, and C the set of
complex numbers. In this paper, first we determine the general solutions f, g: S→ C of …

[PDF][PDF] Some generalizations of trigonometric functional equations

Ż Fechner - Summer School for PhD Students in Mathematics - utupub.fi
We discuss some trigonometric functional equations for mappings defined on a group and
taking values in the field of complex numbers. Moreover, we will present some methods …