#123 simplify some special function expressions

[Ralf Stephan]

These appeared in the result of 1st order ODEs. I'm using Sage which has Maxima-5.35.1

Here the (Ei+gamma) is simply 1/t^2:

sage: desolve(diff(y,t)-(2*t*y-6/t-6/t^3), y).simplify_full()
_C*e^(t^2) - 3*Ei(-t^2)*e^(t^2) + 3*e^(t^2)*gamma(-1, t^2)

And here the sqrt*gamma part could be simplified to erf:

sage: desolve(diff(y,t)-(2*t*y-6/t^2), y).simplify_full()
(_C*t*e^(t^2) + 3*sqrt(t^2)*e^(t^2)*gamma(-1/2, t^2))/t

It would be nice to at least have the option to do this automatically.

[Raymond Toy]

Set gamma_expand:true.

[Robert Dodier]

Looks like gamma_expand covers it, therefore closing this item.