To avoid redundancies I put some of the more often used abbreviations and the, mostly mathematical, definitions here.
(This blogging software does some weird things to the former definition list here, my…)
The set of natural numbers according to Zermelo–Fraenkel (ZF) set theory:
Define and to construct finite sets whose cardinalities build the set of the naturals numbers .
is the set of integers modulo
is the set of primes
is not a number. Nevertheless it gets used here in limits like or . It is invisible in the latter example. Twice.
is the set of infinite integers. Not used here.