E1(x) Exponential Integral Function One

E1(x) = Integral{1, inf}[e^(−t*x) / t]dt = Integral{x, inf}[e^(−t) / t]dt.
E1(x) is related to Ei(x) and is computed by:

E1(x) = −Ei(−x).

See: Exponential Integral -- From MathWorld
And: Wolfram Function Evaluation -- ExpIntegralEi (E1(x) = −Ei(−x))
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