In sage 10.7.beta8 and later I get an error when creating the Iwahori Hecke
algebra for a Coxeter group if the Coxeter group has
implementation='coxeter3' which is supplied by the optional "coxeter3"
package.
I think that this error is introduced by PR #40328 which was merged into
sage 10.7.beta8.
Steps to reproduce:
sage: W_cox3 = CoxeterGroup('A2', implementation='coxeter3'); W_cox3
sage: T_cox3 = IwahoriHeckeAlgebra(W_cox3, 1)
This results in a rather long error message in which the most important
part, I think, is a pointer to line 512 of
src/sage/algebras/iwahori_hecke_algebra.py where the attribute
W.is_commutative is checked. The error messages ends with "AttributeError:
'CoxeterGroup_with_category' object has no attribute 'is_commutative'".
Cross check: This error does not occur in sage-10.7.beta7 or earlier. This
error does also not occur if I replace W_cox3 by W_refl =
CoxeterGroup('A2', implementation='reflection'), because W_refl has an
attribute is_commutative but W_cox3 has not.
--
You received this message because you are subscribed to the Google Groups
"sage-support" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion visit
https://groups.google.com/d/msgid/sage-support/99707bfa-400c-4b63-b37b-b7eb78cc863dn%40googlegroups.com.
