- union() (sage.sets.disjoint_set.DisjointSet_of_hashables method)
- (sage.sets.disjoint_set.DisjointSet_of_integers method)
- (sage.sets.set.Set_object method)
- (sage.sets.set.Set_object_enumerated method)
- UniqueFactory (class in sage.structure.factory)
- UniqueRepresentation (class in sage.structure.unique_representation)
- unit() (sage.structure.factorization.Factorization method)
- universe() (sage.structure.factorization.Factorization method)
- (sage.structure.sequence.Sequence_generic method)
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- unpickle_all() (in module sage.structure.sage_object)
- unpickle_global() (in module sage.structure.sage_object)
- unrank() (sage.sets.finite_enumerated_set.FiniteEnumeratedSet method)
- (sage.sets.integer_range.IntegerRangeFinite method)
- (sage.sets.integer_range.IntegerRangeInfinite method)
- (sage.sets.non_negative_integers.NonNegativeIntegers method)
- (sage.sets.primes.Primes method)
- (sage.sets.set_from_iterator.EnumeratedSetFromIterator method)
- unreduce() (in module sage.structure.unique_representation)
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