Analytic Functions and Complex Analysis: Understanding the Relationship

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SUMMARY

Analytic functions in complex analysis are defined as functions that are differentiable in an open set, which implies they are also infinitely differentiable. This relationship is specific to complex functions, as the property does not hold in real analysis. The discussion confirms that while all analytic functions are smooth, not all smooth functions are analytic, highlighting the distinct nature of analytic functions in complex domains.

PREREQUISITES
  • Understanding of complex differentiation
  • Familiarity with the concept of analytic functions
  • Knowledge of smooth functions and their properties
  • Basic comprehension of open sets in topology
NEXT STEPS
  • Study the proof that complex differentiability implies analyticity
  • Explore the differences between analytic and smooth functions
  • Learn about open sets and their significance in complex analysis
  • Investigate applications of analytic functions in various fields of mathematics
USEFUL FOR

Mathematicians, students of complex analysis, and anyone interested in the properties and applications of analytic functions in mathematical theory.

ultimateceej
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I don't really know which forum to post this in but I just have a quick question:

Is it sufficient to say that a function is analytic on a domain if it has a derivative and the derivative is continuous?
 
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I believe this from Wikipedia answers your question:

Any analytic function is smooth, that is, infinitely differentiable. The converse is not true; in fact, in a certain sense, the analytic functions are rather sparse compared to the infinitely differentiable functions.
 
Thanks for the reply. I went to the wikipedia page and saw your post, but also came across this:

It can be proved that any complex function differentiable (in the complex sense) in an open set is analytic.

So it's not true in general, but in a complex context it is (according to wikipedia). Thanks for replying and pointing me to the answer. :smile:
 

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