A note on d’Alembert’s functional equation on a restricted domain

被引:0
|
作者
Anna Bahyrycz
Janusz Brzdȩk
机构
[1] Pedagogical University,Department of Mathematics
来源
Aequationes mathematicae | 2014年 / 88卷
关键词
39B52; 39B55; d’Alembert’s functional equation; cosine function; restricted domain; quadratically closed field;
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摘要
Let A be a subgroup of a commutative group (G, +) and P be a quadratically closed field. We give the full description of all pairs of functions f : G → P and g : A → P such that f(x +  y) +  f(x − y) =  2f(x)g(y) for (x, y) ∈ G ×  A.
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页码:169 / 173
页数:4
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