Shouldn't this be an easy integral to compute?
sage: y = var('y')
sage: t = var('t')
sage: integrate(y*e^(-y),y,0,t)
Huge amount of error messages deleted, followed by:
ValueError: Computation failed since Maxima requested additional
constraints; using the 'assume' command before evaluation *may* help
(example of legal syntax is 'assume(t>0)', see `assume?` for more details)
Is t positive, negative or zero?
Then I can fix it like this.
sage: assume(t>0)
sage: integrate(y*e^(-y),y,0,t)
-(t + 1)*e^(-t) + 1
However the integral is an analytic function, and exists even if t is
negative or complex.
Thanks, Stephen
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