Full elasticity conjecture for cyclic rational semirings

Let rQ>1Nr\in\mathbb{Q}_{>1}\setminus\mathbb{N}, and write r=n(r)/d(r)r=\mathsf{n}(r)/\mathsf{d}(r) in lowest terms. Let SrS_r be the cyclic rational semiring generated by the geometric sequence determined by rr. A monoid is fully elastic if its set of elasticities is all of Q1{}\mathbb{Q}_{\geq 1}\cup\{\infty\}. Full elasticity conjecture. If

n(r)>d(r)+1,\mathsf{n}(r)>\mathsf{d}(r)+1,

then SrS_r is fully elastic. The preceding result establishes density of the set of elasticities under the same condition on rr, but full elasticity requires realizing every permitted elasticity and remains open.

Sources & referencesView supporting material

Primary source

Scott T. Chapman, Felix Gotti and Marly Gotti, “Factorization invariants of Puiseux monoids generated by geometric sequences”, arXiv:1904.00219 (2019).

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