LogIntegral[z] is the logarithmic integral function .
Mathematical function (see Section A.3.10).
The logarithmic integral function is defined by , where the principal value of the integral is taken.
LogIntegral[z] has a branch cut discontinuity in the complex z plane running from to .
See The Mathematica Book: Section 3.2.10.
See also: ExpIntegralE.
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