Keywords: E1ofImaginaryArgument.png w Exponential integral of imaginary argument <math> \rm E _1 \rm i \ ~x </math> versus <math>~x~</math> real part black and imaginary part red Maple code plot Re Ei 1 I x Im Ei 1 I x x 0 02 11 color black red year 2008 Domitori use it for free not yet Functions Images with Maple source code |