|
|
|
|
On a generalized Hyers-Ulam stability of trigonometric functional equations
|
|
|
|
|
|
|
|
نویسنده
|
chung j. ,chang j.
|
|
منبع
|
journal of applied mathematics - 2012 - دوره : 2012 - شماره : 0
|
|
چکیده
|
Let g be an abelian group,let be the field of complex numbers,and let f,g: g → ℂ. we consider the generalized hyers-ulam stability for a class of trigonometric functional inequalities,| f (x - y) - f (x) g (y) + g (x) f (y) | ≤ ψ(y),| g (x - y) - g (x) g (y) - f (x) ≤ f (y) | ≤ ψ (y),where ψ:g → ℝ is an arbitrary nonnegative function. copyright © 2012 jaeyoung chung and jeongwook chang.
|
|
|
|
|
آدرس
|
department of mathematics,kunsan national university, South Korea, department of mathematics education,dankook university, South Korea
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Authors
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|