gives the exponential integral function .


  • Mathematical function, suitable for both symbolic and numerical manipulation.
  • .
  • ExpIntegralE[n,z] has a branch cut discontinuity in the complex z plane running from to 0.
  • For certain special arguments, ExpIntegralE automatically evaluates to exact values.
  • ExpIntegralE can be evaluated to arbitrary numerical precision.
  • ExpIntegralE automatically threads over lists.
Introduced in 1988
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