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This paper treats the variation of sets. We attempt to formulate convergenceand continuity of set-valued functions in a different way from the theories onsequences of sets and correspondence. In the final section, we also attempt todefine differentiation of set-valued functions in a Euclidean space bybijection between two sets.

Formulation of Convergence and Continuity in Variation of Sets in a Different Way from Sequences of Sets and Correspondence