#17953: symbolic function args prevent forced conversion of result to numeric
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Reporter: rws | Owner:
Type: defect | Status: positive_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|
adc230dff1b357478155978ecc1149d58f282403
Dependencies: | Stopgaps:
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Changes (by mmezzarobba):
* status: needs_review => positive_review
Comment:
Replying to [comment:5 vdelecroix]:
> 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.
I tend to agree, but the present ticket is a step in the right direction
in any case: it fixes some of the issues without making it harder to
improve things later on.
--
Ticket URL: <http://trac.sagemath.org/ticket/17953#comment:11>
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