#813: forced coercion vs. automatic coercion
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Reporter: nbruin | Owner: roed
Type: defect | Status: new
Priority: major | Milestone: sage-4.7.1
Component: basic arithmetic | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Comment(by SimonKing):
For the record: I did post on [http://groups.google.com/group/sage-
algebra/browse_thread/thread/7f884449de17bb31 sage-algebra], not sage-
devel.
There, I argued that there should be no coercion/pushout between
`QQ[x][y]` and `QQ[y][x]`, even though there is a coercion between
`QQ[x,y]` and `QQ[y,x]`. I wonder whether my argument is convincing,
though.
However, even in that case, I could imagine that with a little more effort
one could modify the algorithm behind `sage.categories.pushout.pushout` so
that the pushout of `Frac(QQ['x'])['y']` and `QQ['x','y']` is
`Frac(QQ['x'])['y']`. Do we want that behaviour of the pushout?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/813#comment:7>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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