1. A Cosine Functional Equation with Restricted Argument
- Author
-
L. B. Etigson
- Subjects
Discrete mathematics ,Applied Mathematics ,General Mathematics ,Mathematical analysis ,010102 general mathematics ,Characteristic equation ,010103 numerical & computational mathematics ,01 natural sciences ,Algebra ,Integro-differential equation ,Argument ,Functional equation ,Riccati equation ,Discrete Mathematics and Combinatorics ,Trigonometric functions ,0101 mathematics ,Mathematics - Abstract
We name a functional equation with restricted argument one in which at least one of the variables is restricted to a certain discrete subset of the domain of the other variable(s). In particular, the subset may consist of a single element.The purpose of this paper is to present a functional equation satisfied only by cosine functions.
- Published
- 1974