# Examples of finite monoids¶

sage.categories.examples.finite_monoids.Example

alias of IntegerModMonoid

class sage.categories.examples.finite_monoids.IntegerModMonoid(n=12)

An example of a finite monoid: the integers mod $$n$$

This class illustrates a minimal implementation of a finite monoid.

EXAMPLES:

sage: S = FiniteMonoids().example(); S
An example of a finite multiplicative monoid: the integers modulo 12

sage: S.category()
Category of finite monoids


We conclude by running systematic tests on this monoid:

sage: TestSuite(S).run(verbose = True)
running ._test_an_element() . . . pass
running ._test_associativity() . . . pass
running ._test_category() . . . pass
running ._test_elements() . . .
Running the test suite of self.an_element()
running ._test_category() . . . pass
running ._test_eq() . . . pass
running ._test_not_implemented_methods() . . . pass
running ._test_pickling() . . . pass
pass
running ._test_elements_eq_reflexive() . . . pass
running ._test_elements_eq_symmetric() . . . pass
running ._test_elements_eq_transitive() . . . pass
running ._test_elements_neq() . . . pass
running ._test_enumerated_set_contains() . . . pass
running ._test_enumerated_set_iter_cardinality() . . . pass
running ._test_enumerated_set_iter_list() . . . pass
running ._test_eq() . . . pass
running ._test_not_implemented_methods() . . . pass
running ._test_one() . . . pass
running ._test_pickling() . . . pass
running ._test_prod() . . . pass
running ._test_some_elements() . . . pass

class Element

EXAMPLES:

sage: from sage.structure.element_wrapper import DummyParent
sage: a = ElementWrapper(DummyParent("A parent"), 1)


TESTS:

sage: TestSuite(a).run(skip = "_test_category")

sage: a = ElementWrapper(1, DummyParent("A parent"))
doctest:...: DeprecationWarning: the first argument must be a parent
See http://trac.sagemath.org/14519 for details.


Note

ElementWrapper is not intended to be used directly, hence the failing category test.

wrapped_class

alias of Integer

IntegerModMonoid.an_element()

Returns an element of the monoid, as per Sets.ParentMethods.an_element().

EXAMPLES:

sage: M = FiniteMonoids().example()
sage: M.an_element()
6

IntegerModMonoid.one()

Returns the one of the monoid, as per Monoids.ParentMethods.one().

EXAMPLES:

sage: M = FiniteMonoids().example()
sage: M.one()
1

IntegerModMonoid.product(x, y)

Returns the one of the monoid, as per Semigroups.ParentMethods.product().

EXAMPLES:

sage: M = FiniteMonoids().example()
sage: M.product(M(3), M(5))
3

IntegerModMonoid.semigroup_generators()

Returns a set of generators for self, as per Semigroups.ParentMethods.semigroup_generators(). Currently this returns all integers mod $$n$$, which is of course far from optimal!

EXAMPLES:

sage: M = FiniteMonoids().example()
sage: M.semigroup_generators()
Family (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11)


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