Wolfram Language & System 10.3 (2015)|Legacy Documentation

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is the logarithmic integral function .


  • Mathematical function, suitable for both symbolic and numerical manipulation.
  • 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 .
  • For certain special arguments, LogIntegral automatically evaluates to exact values.
  • LogIntegral can be evaluated to arbitrary numerical precision.
  • LogIntegral automatically threads over lists.
Introduced in 1988