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Hypograph (mathematics) : ウィキペディア英語版
Hypograph (mathematics)

In mathematics, the hypograph or subgraph of a function ''f'' : R''n'' → R is the set of points lying on or below its graph:
: \mbox f = \,\, \mu \le f(x) \} \subseteq \mathbb^
and the strict hypograph of the function is:
: \mbox_S f = \,\, \mu < f(x) \} \subseteq \mathbb^.
The set is empty if f \equiv -\infty.
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 \mathbb^n.
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)
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