Description: Express "less than or equals" for general strict orders. (Contributed by Stefan O'Rear, 17-Jan-2015)
Ref | Expression | ||
---|---|---|---|
Assertion | poleloe | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | brun | |
|
2 | ideqg | |
|
3 | 2 | orbi2d | |
4 | 1 3 | bitrid | |