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Abstract We have proved theHyers-Ulam stability and the hyperstability of the quadratic functional equation f (x + y + z) + f (x + y − z) + f (x… Click to show full abstract
Abstract We have proved theHyers-Ulam stability and the hyperstability of the quadratic functional equation f (x + y + z) + f (x + y − z) + f (x − y + z) + f (−x + y + z) = 4[f (x) + f (y) + f (z)] in the class of functions from an abelian group G into a Banach space.
Keywords:
hyperstability quadratic;
stability hyperstability;
quadratic functional;
functional equation
Journal Title: Demonstratio Mathematica
Year Published: 2018
Link to full text (if available)
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Journal Title: Demonstratio Mathematica
Year Published: 2018
Link to full text (if available)
Share on Social Media: Sign Up to like & get
recommendations!