Description: The second Chebyshev function is nonnegative. (Contributed by Mario Carneiro, 7-Apr-2016)
Ref | Expression | ||
---|---|---|---|
Assertion | chpge0 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ef0 | |
|
2 | efchpcl | |
|
3 | 2 | nnge1d | |
4 | 1 3 | eqbrtrid | |
5 | 0re | |
|
6 | chpcl | |
|
7 | efle | |
|
8 | 5 6 7 | sylancr | |
9 | 4 8 | mpbird | |