11111: revert subobjects of algebras

src/sage/categories/algebras.py

@@ -217,26 +217,3 @@ def extra_super_categories(self):
             """
             from sage.categories.coalgebras import Coalgebras
             return [Coalgebras(self.base_category().base_ring())]
-    class Subobjects(SubobjectsCategory):
-
-        class ElementMethods:
-
-            def _mul_(self, right):
-                r"""
-                Product of two elements.
-                INPUT::
-
-                    - ``self``, ``right`` -- two elements
-
-                If B is a SubModuleWithBasis of A, then the multiplication law of B is
-                inherited from the multiplication of A.
-
-                EXAMPLES::
-
-                    sage: Z = SymmetricGroup(5).algebra(QQ).center()
-                    sage: B = Z.basis()
-                    sage: B[3] * B[2]
-                    4*B[2] + 6*B[3] + 5*B[6]
-                """
-                p = self.parent()
-                return p.retract( self.lift() * right.lift())