Difference between revisions of "Relationship between the exponential integral and upper incomplete gamma function"

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Revision as of 03:42, 23 April 2015

Theorem: The following formula holds: $$E_n(z)=z^{n-1}\Gamma(1-n,z),$$ where $E_n$ denotes the exponential integral and $\Gamma$ denotes the incomplete gamma function.

Proof: