In mathematics, the exponential integral Ei {\displaystyle \operatorname {Ei} } is a special function on the complex plane. It is defined as one particular definite integral of the ratio between an exponential function and its argument.
In mathematics, the exponential integral Ei {\displaystyle \operatorname {Ei} } is a special function on the complex plane. It is defined as one particular definite integral of the ratio between an exponential function and its argument.
Source: Wikipedia "Exponential integral" · CC BY-SA 4.0
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