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1992 | OriginalPaper | Buchkapitel

Real- and Complex-valued Functions

verfasst von : Bernard R. Gelbaum

Erschienen in: Problems in Real and Complex Analysis

Verlag: Springer New York

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A map ϕ: of a convex open subset K of a vector space V is convex iff for all t in [0,1] and any x and y in K$$ \varphi (t{\text{x + (1 - }}t{\text{)y}}) \leqslant t\varphi ({\text{x}}) + (1 - t)\varphi ({\text{y}}) $$. When K is an open interval in ℝ and a ∈ K, a line l through (a, φ(a)) is a supporting line iff l lies below the graph of φ: {(p, q) ∈ l} ⇒ {q ≤ φ(p)}.

Metadaten
Titel
Real- and Complex-valued Functions
verfasst von
Bernard R. Gelbaum
Copyright-Jahr
1992
Verlag
Springer New York
DOI
https://doi.org/10.1007/978-1-4612-0925-6_3