#12650: Perform safe simplifications in Expression.simplify()
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Reporter: mjo | Owner: mjo
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-5.0
Component: symbolics | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Michael Orlitzky | Merged in:
Dependencies: | Stopgaps:
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Changes (by roed):
* status: needs_review => needs_work
Comment:
I'm happy with the overall plan, but the upgrade to Maxima 5.26 (#10682,
merged in 5.0.beta8) produces a conflict. With your patch, we have the
following doctests from sage.calculus.wester.
{{{
sage: # (YES) Assuming Re(x)>0, Re(y)>0, deduce
x^(1/n)*y^(1/n)-(x*y)^(1/n)=0.
sage: # Maxima 5.26 has different behaviours depending on the current
sage: # domain.
sage: # To stick with the behaviour of previous versions, the domain is
set
sage: # to 'real' in the following.
sage: # See Trac #10682 for further details.
sage: n = var('n')
sage: f = x^(1/n)*y^(1/n)-(x*y)^(1/n)
sage: assume(real(x) > 0, real(y) > 0)
sage: f.simplify()
0
sage: maxima = sage.calculus.calculus.maxima
sage: maxima.set('domain', 'real') # set domain to real
sage: f.simplify()
0
sage: maxima.set('domain', 'complex') # set domain back to its default
value
sage: forget()
}}}
Before your patch, the first f.simplify() didn't do much:
{{{
sage: f = x^(1/n)*y^(1/n)-(x*y)^(1/n)
sage: assume(real(x) > 0, real(y) > 0)
sage: f.simplify()
x^(1/n)*y^(1/n) - (x*y)^(1/n)
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12650#comment:2>
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