>>615 補足

まあ、下記でも百回音読してくださいね
”For instance, the ordinal number of the set N of all positive integers, ordered by the relation ≦, is ω.
The ordinal number of the set consisting of 1 and numbers of the form 1-1/n where n∈N, ordered by the relation ≦, is ω+1.”
これで、上記の” 1 ”の左の直前はない。1-1/n ｜ｎ∈N ですからね
でも、≦による二項関係は、ω+1なる列に拡張されている （” ordered by the relation ≦, is ω+1”）

君らには、難しいかなｗ

https://encyclopediaofmath.org/wiki/Ordinal_number
encyclopediaofmath
Ordinal number

The order type of a well-ordered set.
This notion was introduced by G. Cantor in 1883 (see [2]).

For instance, the ordinal number of the set N of all positive integers, ordered by the relation ≦, is ω.
The ordinal number of the set consisting of 1 and numbers of the form 1-1/n where n∈N, ordered by the relation ≦, is ω+1.