Trigonometric Functional Equations
In this chapter, trigonometric functional equations are studied on reals, groups, Hilbert space, etc., and cosine equations on reals, non-Abelian groups, and Hilbert space are studied. Sine equations, analytic solutions, addition and subtraction formulas, operator values, and some generalizations are studied also, and counterexamples are provided.
KeywordsAbelian Group Functional Equation Banach Algebra Continuous Solution Nonzero Solution
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