APPROXIMATION OF ALMOST EULER-LAGRANGE QUADRATIC MAPPINGS BY QUADRATIC MAPPINGS

APPROXIMATION OF ALMOST EULER-LAGRANGE QUADRATIC MAPPINGS BY QUADRATIC MAPPINGS

For any fixed integers k, l with kl(l − 1) ̸= 0, we establish the generalized Hyers-Ulam stability of an Euler-Lagrange quadratic functional equation

1. Introduction

2. Stability of (1.5) in Banach spaces

3. Stability of (1.5) in non-Archimedean spaces

References

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