Opened 3 years ago

#21057 new defect

Assumption ignored in indefinite integral computation

Reported by: rws Owned by:
Priority: major Milestone: sage-7.3
Component: calculus Keywords:
Cc: Merged in:
Authors: Reviewers:
Report Upstream: N/A Work issues:
Branch: Commit:
Dependencies: Stopgaps:

Description

sage: _=var("a b c d x")
sage: forget()                 
sage: assume(b*(a*d-b*c)>0)    
sage: 1/((a+b*x)*(c+d*x)^(1/3))
1/((b*x + a)*(d*x + c)^(1/3))
sage: _.integrate(x)

ValueError: Computation failed since Maxima requested additional constraints;
using the 'assume' command before evaluation *may* help (example of 
legal syntax is 'assume(b*(a*d-b*c)
>0)', see `assume?` for more details)
Is b*(a*d-b*c)
    positive or negative?

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