Enumeration of idempotents in planar diagram monoids
Igor Dolinka, James East, Des FitzGerald, Nicholas Ham, James Hyded, Nicholas Loughlin, James D. Mitchell
We classify and enumerate the idempotents in several planar diagram monoids: namely, the Motzkin, Jones (a.k.a. Temperley-Lieb) and Kauffman monoids. The classification is in terms of certain vertex- and edge-coloured graphs associated to Motzkin diagrams. The enumeration is necessarily algorithmic in nature, and is based on parameters associated to cycle components of these graphs. We compare our algorithms to existing algorithms for enumerating idempotents in arbitrary (regular *-) semigroups, and give several tables of calculated values.
Κατηγορίες:
Τόμος:
522
Έτος:
2019
Εκδότης:
Journal of Algebra
Γλώσσα:
english
Σελίδες:
351
Αρχείο:
PDF, 446 KB
IPFS:
,
english, 2019