Description: Utility theorem: index-independent form of df-edgf . (Contributed by AV, 16-Nov-2021)
Ref | Expression | ||
---|---|---|---|
Assertion | edgfid | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-edgf | |
|
2 | 1nn0 | |
|
3 | 8nn | |
|
4 | 2 3 | decnncl | |
5 | 1 4 | ndxid | |