Difference between revisions of "Ei(x)=-Integral from -x to infinity of e^(-t)/t dt"
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(Created page with "==Theorem== The following formula holds: $$\mathrm{Ei}(-x) = -\displaystyle\int_x^{\infty} \dfrac{e^{-t}}{t} \mathrm{d}t,$$ where $\mathrm{Ei}$ denotes the exponential integ...") |
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Revision as of 03:29, 17 March 2018
Theorem
The following formula holds: $$\mathrm{Ei}(-x) = -\displaystyle\int_x^{\infty} \dfrac{e^{-t}}{t} \mathrm{d}t,$$ where $\mathrm{Ei}$ denotes the exponential integral Ei and $e^{-t}$ denotes the exponential.
