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A necessary and sufficient condition for differentiability

Published online by Cambridge University Press:  31 October 2008

R. L. Goodstein
R. L. Goodstein
Affiliation:
University College, Leicester.
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The familiar Lemma introduced by Goursat in his proof of Cauchy's theorem suggests the following necessary and sufficient condition for differentiability of a complex function f(z).

Type
Research Article
Information
Edinburgh Mathematical Notes , Volume 37 , January 1949 , pp. 13 - 16
Copyright
Copyright © Edinburgh Mathematical Society 1949