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closed graph of correspondences

Hemicontinuity — In mathematics, the concept of continuity as it is defined for single valued functions is not immediately extendible to multi valued mappings or correspondences. In order to derive a more generalized definition, the dual concepts of upper… … Wikipedia
Duality (mathematics) — In mathematics, a duality, generally speaking, translates concepts, theorems or mathematical structures into other concepts, theorems or structures, in a one to one fashion, often (but not always) by means of an involution operation: if the dual… … Wikipedia
Scale-invariant feature transform — Feature detection Output of a typical corner detection algorithm … Wikipedia
Brouwer fixed point theorem — In mathematics, the Brouwer fixed point theorem is an important fixed point theorem that applies to finite dimensional spaces and which forms the basis for several general fixed point theorems. It is named after Dutch mathematician L. E. J.… … Wikipedia
Pentagram — For other uses, see Pentagram (disambiguation). Regular pentagram A pentagram Type Star polygon Edges and vertices 5 Schläfli symbol {5/2} … Wikipedia
Correspondence (mathematics) — In mathematics and mathematical economics, correspondence is a term with several related but not identical meanings. In general mathematics, correspondence is an alternative term for a relation between two sets. Hence a correspondence of sets X… … Wikipedia