On the local k-elasticities of Puiseux monoids

Abstract: If $M$ is an atomic monoid and $x$ is a nonzero non-unit element of $M$, then the set of lengths $\mathsf{L}(x)$ of $x$ is the set of all possible lengths of factorizations of $x$, where the length of a factorization is the number of irreducible factors (counting repetitions). In a paper, F. Gotti and C. O'Neil studied the sets of elasticities $\mathcal{R}(P) := {\sup \mathsf{L}(x)/\inf \mathsf{L}(x) : x \in P}$ of Puiseux monoids $P$. Here we take this study a step forward and explore the local $k$-elasticities of the same class of monoids. We find conditions under which Puiseux monoids have all their local elasticities finite as well as conditions under which they have infinite local $k$-elasticities for sufficiently large $k$. Finally, we focus our study of the $k$-elasticities on the class of primary Puiseux monoids, proving that they have finite local $k$-elasticities if either they are boundedly generated and do not have any stable atoms or if they do not contain $0$ as a limit point.