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ExpIntegralE
 ExpIntegralE[n, z] gives the exponential integral function  .
Mathematical function (see Section A.3.10).
 .
ExpIntegralE[n, z] has a branch cut discontinuity in the complex z plane running from  to  .
See The Mathematica Book: Section 3.2.10.
See also: ExpIntegralEi, Erf, LogIntegral, SinIntegral, CosIntegral.
Further Examples
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