Boris Borcic bborcic at gmail.com
Wed Sep 5 08:17:08 EDT 2007

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Paul Rubin wrote:
> Also, for
> example, the derivative of a complex valued function means something
> considerably stronger than the derivative of a real valued function.

I vaguely remember (it has been decades) an amazingly beautiful russian doll 
system of four of five theorems, the first hypothesizing a function of a complex 
variable with a property that IIRC appeared somewhat weaker than 
differentiability, and the latter theorems not hypothesizing anything more, but 
pushing the consequence further to ever stronger properties.

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