Description: Utility theorem: index-independent form of df-lng . (Contributed by Thierry Arnoux, 27-Mar-2019)
Ref | Expression | ||
---|---|---|---|
Assertion | lngid | |- LineG = Slot ( LineG ` ndx ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-lng | |- LineG = Slot ; 1 7 |
|
2 | 1nn0 | |- 1 e. NN0 |
|
3 | 7nn | |- 7 e. NN |
|
4 | 2 3 | decnncl | |- ; 1 7 e. NN |
5 | 1 4 | ndxid | |- LineG = Slot ( LineG ` ndx ) |