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In mathematics, the hypograph or subgraph of a function ''f'' : R''n'' → R is the set of points lying on or below its graph: : and the strict hypograph of the function is: : The set is empty if . The domain (rather than the co-domain) of the function is not particularly important for this definition; it can be an arbitrary set instead of . Similarly, the set of points on or above the function's graph is its epigraph. ==Properties== A function is concave if and only if its hypograph is a convex set. The hypograph of a real affine function ''g'' : R''n'' → R is a halfspace in R''n''+1. A function is upper semicontinuous if and only if its hypograph is closed. 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Hypograph (mathematics)」の詳細全文を読む スポンサード リンク
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