Check identity rather than equality from coset_representative.

sagemath · Mar 9, 2016 · f38620a · f38620a
1 parent bea6b3c
commit f38620a
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/sage/categories/weyl_groups.py b/src/sage/categories/weyl_groups.py
@@ -196,7 +196,8 @@ def succ(x):
                     elt, is_quantum, scalar = NPR_data[alpha]
                     wr = x * elt
                     wrc = wr.coset_representative(index_set)
-                    if wrc == wr and length(wr) == w_length_plus_one:
+                    # coset_representative returns wr if nothing gets changed
+                    if wrc is wr and length(wr) == w_length_plus_one:
                         successors.append((wr, alpha))
                     elif is_quantum and length(wrc) == w_length_plus_one - scalar:
                         successors.append((wrc, alpha))