Dual functorial construction¶
AUTHORS:
- Nicolas M. Thiery (2009-2010): initial revision
-
class
sage.categories.dual.
DualFunctor
¶ Bases:
sage.categories.covariant_functorial_construction.CovariantFunctorialConstruction
A singleton class for the dual functor
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class
sage.categories.dual.
DualObjectsCategory
(category, *args)¶ Bases:
sage.categories.covariant_functorial_construction.CovariantConstructionCategory
TESTS:
sage: from sage.categories.covariant_functorial_construction import CovariantConstructionCategory sage: class FooBars(CovariantConstructionCategory): ....: _functor_category = "FooBars" ....: _base_category_class = (Category,) sage: Category.FooBars = lambda self: FooBars.category_of(self) sage: C = FooBars(ModulesWithBasis(ZZ)) sage: C Category of foo bars of modules with basis over Integer Ring sage: C.base_category() Category of modules with basis over Integer Ring sage: latex(C) \mathbf{FooBars}(\mathbf{ModulesWithBasis}_{\Bold{Z}}) sage: import __main__; __main__.FooBars = FooBars # Fake FooBars being defined in a python module sage: TestSuite(C).run()