AngouriMath
Ei(AngouriMath.Entity)
Method (no overloads)
Summary
The exponential integral, Ei(z) = gamma + (ln z - ln(1/z))/2 + sum z^k/(k k!)
Parameter "a"
The argument, any complex number but 0
Returns
The Eif node
Remarks
On the real line Ei(x) is the principal value of int_-oo^x e^t/t dt , real on
either side of 0, so it is whatint e^x/x dx is in closed form. Off it, the cut is
the negative real axis, as forln , but Ei keeps its real value on the cut
itself:Ei(-1) is about -0.2194 , and just above the axis it is i pi more.
https://github.com/asc-community/AngouriMath/issues/1501
either side of 0, so it is what
the negative real axis, as for
itself:
https://github.com/asc-community/AngouriMath/issues/1501
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