#20973: Cartan type Aoo
-------------------------------------+-------------------------------------
Reporter: andrew.mathas | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-7.3
Component: combinatorics | Resolution:
Keywords: Cartan type, A | Merged in:
infinity |
Authors: Andrew Mathas | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/andrew.mathas/cartan_type_aoo | 3c5370673410e49fc0acbff86d1ba443c72a44a8
Dependencies: | Stopgaps:
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Comment (by andrew.mathas):
I have addressed all of the comments above. Given the ambiguity between
`oo` and `+oo` I have used `NN` and `ZZ` throughout, although `oo` is a
synonym for `ZZ`:
{{{#!sage
sage: CartanType(['A', NN])
['A', NN]
sage: print(CartanType(['A', NN]).ascii_art())
O---O---O---O---O---O---O---..
0 1 2 3
sage: CartanType(['A', ZZ])
['A', ZZ]
sage: print(CartanType(['A', ZZ]).ascii_art())
..---O---O---O---O---O---O---O---..
-3 -2 -1 0 1 2 3
}}}
There is now a `CartanType_standard` class in `cartan_type.py` but, to be
honest, it does not save a great deal. I played round a little to try and
rationalise the code but everything seems very tangled because small
changes in one place cause errors elsewhere. I think that if the code is
to the cleaned up then it needs to be done by some one who is more
familiar with it and its' applications in sage.
--
Ticket URL: <https://trac.sagemath.org/ticket/20973#comment:20>
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