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Expintegral_e1

Function: expintegral_e1 (<z>) The Exponential Integral E1(z) (A&S 5.1.1)

h=1.79804/8*exp(0.01386/8)*(expintegral_e1(0.01386/8));
       f(x):= exp(-x^2/8)/(0.1+x^2)*x*bessel_j(0, x*r);
   z(r):=1.79804/4*(first(quad_qagi(f(x),x,0.01386/8,inf)));
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(%o1)                                true
(%i2) 

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