Description: 9 + 5 = 14. (Contributed by Mario Carneiro, 19-Apr-2015)
Ref | Expression | ||
---|---|---|---|
Assertion | 9p5e14 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 9nn0 | |
|
2 | 4nn0 | |
|
3 | 3nn0 | |
|
4 | df-5 | |
|
5 | df-4 | |
|
6 | 9p4e13 | |
|
7 | 1 2 3 4 5 6 | 6p5lem | |