Opened 3 years ago
Last modified 3 years ago
#24334 new defect
sympy symbol -> SR drops assumptions
Reported by: | jdemeyer | Owned by: | |
---|---|---|---|
Priority: | major | Milestone: | sage-8.2 |
Component: | symbolics | Keywords: | |
Cc: | rws | Merged in: | |
Authors: | Reviewers: | ||
Report Upstream: | N/A | Work issues: | |
Branch: | Commit: | ||
Dependencies: | #24067 | Stopgaps: |
Description (last modified by )
It is possible to add assumptions on sympy symbols:
sage: from sympy import Symbol sage: n = Symbol("n", integer=True)
However, these are lost when converting to SR
:
def _sympysage_symbol(self): """ EXAMPLES:: sage: from sympy import Symbol sage: assert x._sympy_() == Symbol('x') sage: assert x == Symbol('x')._sage_() """ from sage.symbolic.ring import SR return SR.var(self.name)
This is the indirect cause for the different results below (based on a doctest in src/sage/tests/french_book/recequadiff.py
):
sage: from sympy import Symbol, rsolve_hyper sage: n = Symbol("n", integer=True) sage: rsolve_hyper([-2,1], 2^(n+2), n) 2**n*C0 + 2**(n + 2)*(C0 + n/2) sage: rsolve_hyper([-2,1], 2^(2+n), n) 2**n*C0 - 2**(n + 2)
Change History (2)
comment:1 Changed 3 years ago by
- Description modified (diff)
comment:2 Changed 3 years ago by
- Dependencies set to #24067
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