Description: Domain and range of the prime-counting function pi. (Contributed by Mario Carneiro, 15-Sep-2014)
Ref | Expression | ||
---|---|---|---|
Assertion | ppif | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-ppi | |
|
2 | ppifi | |
|
3 | hashcl | |
|
4 | 2 3 | syl | |
5 | 1 4 | fmpti | |