#17953: symbolic function args prevent forced conversion of result to numeric
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Reporter: rws | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.6
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: Ralf Stephan | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/rws/inconsistency_in_returned_type_of_builtinfunction_result|
f0fe6f4093db35e8ccc1734ef3220ee72162d3e6
Dependencies: | Stopgaps:
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Comment (by vdelecroix):
Hello,
First of all, I think that the content of the branch is ok (I am running
the test right now).
But I found the following behavior weird
{{{
sage: exp(0).parent()
Integer ring
}}}
In my opinion, a function should have a well defined domain and range. In
some cases, the function preserves some subset. Like the function `x ->
x^2` defined in the complex numbers preserves integers, rationals and
algebraic. But considering that `{0}` is a subset of the real numbers on
which `exp` preserve the integers is going too far.
Vincent
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Ticket URL: <http://trac.sagemath.org/ticket/17953#comment:5>
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