Coverage for local/lib/python2.7/site-packages/sage/categories/dual.py : 11%
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""" Dual functorial construction
AUTHORS:
- Nicolas M. Thiery (2009-2010): initial revision """ #***************************************************************************** # Copyright (C) 2009 Nicolas M. Thiery <nthiery at users.sf.net> # # Distributed under the terms of the GNU General Public License (GPL) # http://www.gnu.org/licenses/ #*****************************************************************************
# could do SelfDualCategory
from sage.categories.covariant_functorial_construction import CovariantFunctorialConstruction, CovariantConstructionCategory
class DualFunctor(CovariantFunctorialConstruction): """ A singleton class for the dual functor """ _functor_name = "dual" _functor_category = "DualObjects" symbol = "^*"
class DualObjectsCategory(CovariantConstructionCategory):
_functor_category = "DualObjects"
def _repr_object_names(self): """ EXAMPLES::
sage: VectorSpaces(QQ).DualObjects() # indirect doctest Category of duals of vector spaces over Rational Field """ # Just to remove the `objects` |