Trigonometric Functional Equations

  • Palaniappan Kannappan
Part of the Springer Monographs in Mathematics book series (SMM)


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.


Abelian Group Functional Equation Banach Algebra Continuous Solution Nonzero Solution 
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Copyright information

© Springer-Verlag US 2009

Authors and Affiliations

  1. 1.Department of Pure MathematicsUniversity of WaterlooWaterloo ONCanada

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