Hyers-Ulam stability;
quadratic mapping of Apollonius type;
D O I:
10.1016/j.jmaa.2005.09.027
中图分类号:
O29 [应用数学];
学科分类号:
070104 ;
摘要:
Let X, Y be linear spaces. It is shown that if a mapping Q: X -> Y satisfies the following functional equation: [GRAPHICS] then the mapping Q: X -> Y is quadratic. We moreover prove the Hyers-Ulam stability of the functional equation (0.1) in Banach spaces. (c) 2005 Elsevier Inc. All rights reserved.