Abstract
The problem of the stability of the quadratic functional equation (including ULAM-HYERS and RASSIAS types of stability) in normed spaces is investigated.
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Czerwik, S. On the stability of the quadratic mapping in normed spaces. Abh.Math.Semin.Univ.Hambg. 62, 59–64 (1992). https://doi.org/10.1007/BF02941618
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DOI: https://doi.org/10.1007/BF02941618