Description: 7 is less than 8. (Contributed by Mario Carneiro, 15-Sep-2013)
Ref | Expression | ||
---|---|---|---|
Assertion | 7lt8 | |- 7 < 8 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 7re | |- 7 e. RR |
|
2 | 1 | ltp1i | |- 7 < ( 7 + 1 ) |
3 | df-8 | |- 8 = ( 7 + 1 ) |
|
4 | 2 3 | breqtrri | |- 7 < 8 |