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Maximum theorem : ウィキペディア英語版 | Maximum theorem The maximum theorem provides conditions for the continuity of an optimized function and the set of its maximizers as a parameter changes. The statement was first proven by Claude Berge in 1959.〔Ok, p. 306〕 The theorem is primarily used in mathematical economics. ==Statement of theorem== Let and be metric spaces, be a function jointly continuous in its two arguments, and be a compact-valued correspondence. For in and in , let : and : . If is continuous (i.e. both upper and lower hemicontinuous) at some , then is continuous at and is non-empty, compact-valued, and upper hemicontinuous at .
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