Description: Trichotomy of dominance and strict dominance. (Contributed by NM, 4-Jan-2004)
Ref | Expression | ||
---|---|---|---|
Assertion | entri2 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | entric | |
|
2 | brdom2 | |
|
3 | 2 | orbi1i | |
4 | df-3or | |
|
5 | 3 4 | bitr4i | |
6 | 1 5 | sylibr | |