Dual functorial construction

class sage.categories.dual.DualityCategory(s=None)

Bases: sage.categories.category.Category

TESTS:

sage: TestSuite(DualityCategory()).run() # mostly to silence sage -coverage on this abstract class
Failure in _test_not_implemented_methods:
Traceback (most recent call last):
...
AssertionError: Not implemented method: dual
------------------------------------------------------------
The following tests failed: _test_not_implemented_methods
dual()

Returns the dual category

EXAMPLES:

sage: Algebras(QQ).dual()
Category of coalgebras over Rational Field

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