Description: 6 is less than 7. (Contributed by Mario Carneiro, 15-Sep-2013)
Ref | Expression | ||
---|---|---|---|
Assertion | 6lt7 | |- 6 < 7 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 6re | |- 6 e. RR |
|
2 | 1 | ltp1i | |- 6 < ( 6 + 1 ) |
3 | df-7 | |- 7 = ( 6 + 1 ) |
|
4 | 2 3 | breqtrri | |- 6 < 7 |