Abstract
<TEX>$Fo{\check{s}}ner$</TEX> [1] defined a module left (m, n)-derivation and proved the Hyers-Ulam stability of module left (m, n)-derivations. In this note, we prove that every module left (m, n)-derivation is trival if the algebra is unital and <TEX>$m{\neq}n$</TEX>.
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