Labeled Factorization of Integers

Augustine O. Munagi

Abstract


The labeled factorizations of a positive integer $n$ are obtained as a completion of the set of ordered factorizations of $n$. This follows a new technique for generating ordered factorizations found by extending a method for unordered factorizations that relies on partitioning the multiset of prime factors of $n$. Our results include explicit enumeration formulas and some combinatorial identities. It is proved that labeled factorizations of $n$ are equinumerous with the systems of complementing subsets of $\{0,1,\dots,n-1\}$. We also give a new combinatorial interpretation of a class of generalized Stirling numbers.


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