Sparse and slender subsets of monoids

: Honkala J

Publisher: SPRINGER

: 2008

: Semigroup Forum

: SEMIGROUP FORUM

: 76

: 1

: 51

: 57

: 7

: 0037-1912

DOI: https://doi.org/10.1007/s00233-007-9009-5

We generalize the notions of sparse and slender sets for an arbitrary monoid and characterize the unambiguous rational sets which are sparse or slender.