sage.groups.matrix_gps: Add # needs

Author: Matthias Koeppe

src/sage/groups/matrix_gps/coxeter_group.py

@@ -183,7 +183,7 @@ class CoxeterMatrixGroup(UniqueRepresentation, FinitelyGeneratedMatrixGroup_gene
         [2 3 1 3 3]
         [2 2 3 1 2]
         [2 2 3 2 1]
-        sage: W = CoxeterGroup(['H',3], implementation="reflection"); W                 # needs sage.rings.number_field
+        sage: W = CoxeterGroup(['H',3], implementation="reflection"); W                 # needs sage.libs.gap sage.rings.number_field
         Finite Coxeter group over
          Number Field in a with defining polynomial x^2 - 5 with a = 2.236067977499790?
          with Coxeter matrix:
@@ -482,8 +482,8 @@ def order(self):
             sage: W = CoxeterGroup([[1,3],[3,1]])
             sage: W.order()
             6
-            sage: W = CoxeterGroup([[1,-1],[-1,1]])
-            sage: W.order()
+            sage: W = CoxeterGroup([[1,-1],[-1,1]])                                     # needs sage.libs.gap
+            sage: W.order()                                                             # needs sage.libs.gap
             +Infinity
         """
         if self.is_finite():
@@ -593,7 +593,7 @@ def positive_roots(self):
             sage: W.positive_roots()
             ((1, 0, 0), (1, 1, 0), (0, 1, 0), (1, 1, 1), (0, 1, 1), (0, 0, 1))
 
-            sage: # needs sage.rings.number_field
+            sage: # needs sage.libs.gap sage.rings.number_field
             sage: W = CoxeterGroup(['I',5], implementation='reflection')
             sage: W.positive_roots()
             ((1, 0),
@@ -651,7 +651,7 @@ def roots(self):
              (0, -1, -1),
              (0, 0, -1))
 
-            sage: # needs sage.rings.number_field
+            sage: # needs sage.libs.gap sage.rings.number_field
             sage: W = CoxeterGroup(['I',5], implementation='reflection')
             sage: len(W.roots())
             10