eja: add subalgebra() method for algebras.

[sage.d.git] / mjo / eja / eja_subalgebra.py

diff --git a/mjo/eja/eja_subalgebra.py b/mjo/eja/eja_subalgebra.py
index 3b8c67d6176320485ab30549d7cfdbbdc9a48ffa..e2d12d26b01a0deaedeb190d450dfd14ede3c262 100644 (file)
--- a/mjo/eja/eja_subalgebra.py
+++ b/mjo/eja/eja_subalgebra.py
@@ -1,7 +1,11 @@
 from sage.matrix.constructor import matrix
 
-from mjo.eja.eja_algebra import FiniteDimensionalEJA
-from mjo.eja.eja_element import FiniteDimensionalEJAElement
+from sage.combinat.free_module import CombinatorialFreeModule_CartesianProduct
+
+from mjo.eja.eja_algebra import (CartesianProductEJA,
+                                 FiniteDimensionalEJA)
+from mjo.eja.eja_element import (CartesianProductEJAElement,
+                                 FiniteDimensionalEJAElement)
 
 class FiniteDimensionalEJASubalgebraElement(FiniteDimensionalEJAElement):
     """
@@ -230,3 +234,24 @@ class FiniteDimensionalEJASubalgebra(FiniteDimensionalEJA):
 
 
     Element = FiniteDimensionalEJASubalgebraElement
+
+
+
+class CartesianProductEJASubalgebraElement(CartesianProductEJAElement,
+                                           FiniteDimensionalEJASubalgebraElement):
+    pass
+
+class CartesianProductEJASubalgebra(CartesianProductEJA,
+                                    FiniteDimensionalEJASubalgebra):
+
+    def __init__(self, superalgebra, basis, **kwargs):
+        CombinatorialFreeModule_CartesianProduct.__init__(self,
+                                                          superalgebra.cartesian_factors())
+        FiniteDimensionalEJASubalgebra.__init__(self,
+                                                superalgebra,
+                                                basis,
+                                                cartesian_product=True,
+                                                **kwargs)
+
+
+    Element = CartesianProductEJASubalgebraElement