#8821: Adding a section on coercion to the tutorial (guided tour)
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Reporter: SimonKing | Owner: mvngu
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.4.1
Component: documentation | Keywords: tutorial coercion
Author: Simon King | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by SimonKing):
Hi Robert,
Replying to [comment:2 robertwb]:
> First, I might focus less on the types and isinstance corresponding to
mathematical categories, as they can be misleading.
OK, I wanted to give a first approximation on how classes relate with
mathematics. Perhaps I should emphasize that the analogy is not perfect (I
already mention that different classes may also relate with different
implementations of the same mathematical structure).
> {{{ sage: isinstance(matrix(ZZ, 2), RingElement) True sage:
isinstance(matrix(ZZ, 2,3), RingElement) True }}} is False. (I consider
the first a bug.)
Really? The first is a square matrix, so, I think the second is wrong.
> Second, we don't want to create the expectation that Python elements are
unique, as they usually aren't:
Right, that should be clarified.
Thank you!
Simon
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8821#comment:3>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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