A distance function property implying differentiability
1989 ◽
Vol 39
(1)
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pp. 59-70
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Keyword(s):
In a real normed linear space X, properties of a non-empty closed set K are closely related to those of the distance function d which it generates. If X has a uniformly Gâteaux (uniformly Fréchet) differentiable norm, then d is Gâteaux (Fréchet) differentiable at x ∈ X/K if there exists an such thatand is Géteaux (Fréchet) differentiable on X / K if there exists a set P+(K) dense in X/K where such a limit is approached uniformly for all x ∈ P+(K). When X is complete this last property implies that K is convex.
1966 ◽
Vol 15
(1)
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pp. 11-18
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Keyword(s):
1958 ◽
Vol 9
(4)
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pp. 168-169
Keyword(s):
1971 ◽
Vol 12
(3)
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pp. 301-308
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Keyword(s):
1985 ◽
Vol 97
(1)
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pp. 127-136
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Keyword(s):
1976 ◽
Vol 19
(3)
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pp. 359-360
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1975 ◽
Vol 18
(1)
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pp. 45-48
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Keyword(s):