Sorry if I should post this to sage-support ...
Does CartanType currently support A_\infty? I checked the docs and it seems
not but I wanted to check because I need this. Well, actually, I only need
some very rudimentary combinatorial data from the Cartan type, that I can
easily manufacture myself, but thematically I really should index the
objects that I am playing with by the appropriate Cartan types as I am
hoping that what I am doing will work in types A^{(1)}_l, A^{(2)}_{2l},
C^{(1)}_l, D^{(2)}_l and A_\infty.
Whilst looking for this I came across the following, which I guess are
syntax errors on my part rather than bugs:
sage: CartanType(['A',4,1]) # works
['A', 4, 1]
sage: CartanType(['A',infinity])
File "<string>", line unknown
^
SyntaxError: unexpected EOF while parsing
sage: CartanType(['A',-1])
File "<string>", line unknown
^
SyntaxError: unexpected EOF while parsing
sage: CartanType(['A',0])
['A', 0]
Andrew
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