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I wrote a brief note about it

http://dftuz.unizar.es/~rivero/research/0208180.pdf [Broken]

Key word in this matter is Borel resummation.

http://dftuz.unizar.es/~rivero/research/0208180.pdf [Broken]

Key word in this matter is Borel resummation.

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A divergent series is a mathematical series whose terms do not approach a finite limit as the number of terms increases. This means that the sum of the series does not have a definite value and can potentially go to infinity.

The resummation of divergent series is important because it allows us to assign a meaningful value to a series that would otherwise be considered meaningless or infinite. It allows us to make sense of divergent series in various mathematical and scientific contexts.

There are various methods for resumming divergent series, including Borel resummation, zeta function regularization, and analytic continuation. Each method has its own advantages and limitations, and the choice of method depends on the specific series and its intended application.

The resummation of divergent series has applications in many areas of mathematics and science, including quantum field theory, statistical mechanics, and number theory. It is also used in practical applications such as signal processing and data analysis.

Yes, there are ongoing debates and controversies surrounding the resummation of divergent series, especially when it comes to choosing the most appropriate method for a given series. Some methods may produce different results or may not work for certain types of series, leading to disagreement among mathematicians and scientists.

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