Stability for Functional Equation of Mixed Type in Non-Archimedean Normed Spaces

Ick-Soon Chang, Yang-Hi Lee
2014 Journal of Function Spaces  
We take into account the stability of the following functional equationf(x+ay)+f(x-ay)-2f(x)-a2f(y)-a2f(-y)=0in non-Archimedean normed spaces.
doi:10.1155/2014/919646 fatcat:5452qwuhubdqreekxilusqcdre