#7150: Wrong substitution implementation for fraction fields
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Reporter: novoselt | Owner:
Type: defect | Status: new
Priority: critical | Milestone: sage-4.1.3
Component: symbolics | Keywords:
Work_issues: | Author:
Reviewer: | Merged:
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I am getting this in 4.1.1 and find it really frustrating (especially
since it took me several hours to catch):
{{{
sage: QQ["x", "y"].inject_variables()
Defining x, y
sage: e1 = x^2*y^3 - x^2*y - x*y
sage: e2 = e1.parent().fraction_field()(e1)
sage: print e2
x^2*y^3 - x^2*y - x*y
sage: print e2.subs(y=SR("s"))
x^2*s^3 - (x^2 - x)*s
}}}
The last line is wrong!
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7150>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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