Approximate Euler-Lagrange quadratic mappings

作者：Kim Hark Mahn; Lee Juri^*; Son Eunyoung

来源：Journal of Inequalities and Applications, 2012, 58.

DOI：10.1186/1029-242X-2012-58

For any fixed integer with not equal 0, 1, we prove the Hyers-Ulam stability of an Euler-Lagrange-type quadratic functional equation %26lt;br%26gt;f(kx+y)+f(kx-y)=kf(x+y)+kf(x-y)+2k(k-1)f(x)-2(k-1)f(y) %26lt;br%26gt;in normed spaces and in non-Archimedean normed spaces.

• 出版日期2012