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Exponential Integral |
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exponential integral [‚ek·spə′nen·chəl ′int·ə·grəl]
(mathematics) The function defined to be the integral fromxto ∞ of (e-t/t)dtforxpositive. Exponential Integral a special function defined by the integral
This integral cannot be expressed in closed form through elementary functions. If x > 0, then the integral is understood in the sense of its principal value:
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