Ordinal numbers
describe order or position. Like other kinds of numbers, ordinals
can be added, multiplied, and exponentiated. The finite ordinals
(and the finite cardinals) are the natural numbers: 0, 1, 2, ...,
since any two total orderings of a finite set are order isomorphic.
Ordinals were introduced by Georg Cantor in 1897 to accommodate
infinite sequences and to classify sets with certain kinds of order
structures on them.
For example :
James lives in the fifth house from the corner.
Katy finished second in the cross-country race.
