Möbius inversion formula for monoids with zero

Details Möbius inversion formula for monoids with zero Möbius inversion formula for monoids with zero

2009-11-25

arxiv.org/abs/0911.4821v2

Semigroup Forum (2010) 1-15

Mathematics

Combinatorics

12 pages, r\'esum\'e \'etendu soumis \`a FPSAC 2010

Scientific paper

The M\"obius inversion formula, introduced during the 19th century in number theory, was generalized to a wide class of monoids called locally finite such as the free partially commutative, plactic and hypoplactic monoids for instance. In this contribution are developed and used some topological and algebraic notions for monoids with zero, similar to ordinary objects such as the (total) algebra of a monoid, the augmentation ideal or the star operation on proper series. The main concern is to extend the study of the M\"obius function to some monoids with zero, i.e., with an absorbing element, in particular the so-called Rees quotients of locally finite monoids. Some relations between the M\"obius functions of a monoid and its Rees quotient are also provided.

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