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convex conjugate : ウィキペディア英語版
convex conjugate

In mathematics, convex conjugation is a generalization of the Legendre transformation. It is also known as Legendre–Fenchel transformation or Fenchel transformation (after Adrien-Marie Legendre and Werner Fenchel).
== Definition ==

Let X be a real normed vector space, and let X^ be the dual space to X. Denote the dual pairing by
:\langle \cdot , \cdot \rangle : X^ \times X \to \mathbb.
For a functional
:f : X \to \mathbb \cup \
taking values on the extended real number line, the convex conjugate
:f^\star : X^ \to \mathbb \cup \
is defined in terms of the supremum by
:f^ \left( x^ \right) := \sup \left \,
or, equivalently, in terms of the infimum by
:f^ \left( x^ \right) := - \inf \left \.
This definition can be interpreted as an encoding of the convex hull of the function's epigraph in terms of its supporting hyperplanes.〔(【引用サイトリンク】title=Legendre Transform )

(【引用サイトリンク】last1= Nielsen )


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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