#21123: monomials() and lt() for SymmetricFunctions over SymbolicRing broken
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Reporter: schilly | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.3
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by dimpase):
Most probably `SymmetricFunctions` should not allow `SR` as an argument.
By right,
{{{
e = SymmetricFunctions(SR).e()
f = e([2]).expand(3)
}}}
should create `f` in `SR`, but it does something totally different:
{{{
sage: type(f)
<class
'sage.rings.polynomial.multi_polynomial_element.MPolynomial_polydict'>
}}}
However it is possible to convert `f` into a symbolic expression:
{{{
sage: ff=SR(f)
sage: type(ff)
<type 'sage.symbolic.expression.Expression'>
sage: ff.operands()
[x0*x1, x0*x2, x1*x2]
}}}
So the latter might be used as a workaround...
--
Ticket URL: <https://trac.sagemath.org/ticket/21123#comment:1>
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