Marco Fattore, HASSE DIAGRAMS, POSET THEORY AND FUZZY POVERTY MEASURES, Rivista Internazionale di Scienze Sociali, Anno 116, No. 1 (Gennaio-Marzo 2008), pp. 63-75 ...

One example of a poset consists of an integer and all its positive divisors (excluding 1). For instance, the positive divisors of 42 are 2, 3, 6, 7, 14, and 21.