Chebyshev approximation, focal points
A Chebyshev approximation problem is (usually) a problem of uniform approximation -with respect to a compact set M — of a continuous function f by means of a family of continuous functions. Under certain assumptions such a problem may be reduced locally to the minimization of a function of maximum type, the maximum being taken over a finite set of functions. This will be the subject of the present section.
KeywordsLocal Minimum Focal Point Global Minimum Homotopy Equivalent Maximum Type
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