Description: Two ways to say "an integer greater than or equal to 2". (Contributed by Paul Chapman, 23-Nov-2012)
Ref | Expression | ||
---|---|---|---|
Assertion | eluz2b1 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 2z | |
|
2 | 1 | eluz1i | |
3 | 1z | |
|
4 | zltp1le | |
|
5 | 3 4 | mpan | |
6 | df-2 | |
|
7 | 6 | breq1i | |
8 | 5 7 | bitr4di | |
9 | 8 | pm5.32i | |
10 | 2 9 | bitr4i | |