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Built-in Functions

Mathematical Functions

Hypergeometric Related

ExpIntegralEi

Usage

• ExpIntegralEi[z] gives the exponential integral function .

Notes

• Mathematical function (see Section A.3.10).

•

, where the principal value of the integral is taken.

• ExpIntegralEi[z] has a branch cut discontinuity in the complex z plane running from

to

.

• See Section 3.2.11.

• See also: ExpIntegralE, Erf, LogIntegral, SinIntegral, CosIntegral.

• New in Version 1.

Further Examples

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