A new type of Hyers-Ulam-Rassias stability for Drygas functional equation
نویسندگان
چکیده مقاله:
In this paper, we prove the generalized Hyers-Ulam-Rassias stability for the Drygas functional equation$$f(x+y)+f(x-y)=2f(x)+f(y)+f(-y)$$ in Banach spaces by using the Brzc{d}ek's fixed point theorem. Moreover, we give a general result on the hyperstability of this equation. Our results are improvements and generalizations of the main result of M. Piszczek and J. Szczawi'{n}ska [21].
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عنوان ژورنال
دوره 07 شماره 04
صفحات 251- 260
تاریخ انتشار 2018-11-01
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