Description: Bound-variable hypothesis builder for power class. (Contributed by NM, 28-Oct-2003) (Revised by Mario Carneiro, 13-Oct-2016)
Ref | Expression | ||
---|---|---|---|
Hypothesis | nfpw.1 | |
|
Assertion | nfpw | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfpw.1 | |
|
2 | df-pw | |
|
3 | nfcv | |
|
4 | 3 1 | nfss | |
5 | 4 | nfab | |
6 | 2 5 | nfcxfr | |