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Extending classical criteria for differentiation theorems
Author(s) -
Topsøe Flemming
Publication year - 1985
Publication title -
mathematika
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.955
H-Index - 29
eISSN - 2041-7942
pISSN - 0025-5793
DOI - 10.1112/s0025579300010883
Subject(s) - mathematics , contraction (grammar) , mathematical economics , base (topology) , mathematical analysis , linguistics , philosophy
A basic notion in the classical theory of differentiation is that of a differentiation base. However, some differentiation type theorems only require the less restricted notion of a contraction. We demonstrate that the classical criteria, such as the covering criteria of de Possel, continue to hold in the new setting.