Stability and hyperstability of a quadratic functional equation and a characterization of inner product spaces
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DOI: 10.1515/dema-2018-0027
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) +… read more here.
Keywords: hyperstability quadratic; stability hyperstability; quadratic functional; functional equation ... See more keywords