Description: Trichotomy law for extended reals. (Contributed by Thierry Arnoux, 12-Sep-2017)
Ref | Expression | ||
---|---|---|---|
Assertion | xrlelttric | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pm2.1 | |
|
2 | xrlenlt | |
|
3 | 2 | orbi1d | |
4 | 1 3 | mpbiri | |