Exponential Integral

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exponential integral

[‚ek·spə′nen·chəl ′int·ə·grəl]
(mathematics)
The function defined to be the integral from x to ∞ of (e -t / t) dt for x positive.

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:

References in periodicals archive ?
EXPINT = f (SIZE, SIZESQ, FS, KINT, CGINT, DISTECH, ADVINT, RMIMP, AGE)
0 [less than or equal to] EXPINT [less than or equal to] 1 where EXPINT is defined as export/total sales (Wagner, 2001).