I think that I shall never see
An aleph set as nice as Z
A principal ideal domain
The ring of things that keeps me sane
Maybe N has beter grace
But semigroups should know their place
To sum a charge or lepton number
Z can count the sheep to slumber
Units are in Z so rare
Z's not a field, but what the care?
For Z's Euclidean, 1, 2, 3
Unlike Q and R and C
An Abel group, from 1 came you
Before the alephs, one and two
One to one with N it goes
Countable, as Cantor knows
For R was made by fools like me
But only God can make a Z