Description: Utility theorem: index-independent form of df-plusg . (Contributed by NM, 20-Oct-2012)
Ref | Expression | ||
---|---|---|---|
Assertion | plusgid | |- +g = Slot ( +g ` ndx ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-plusg | |- +g = Slot 2 |
|
2 | 2nn | |- 2 e. NN |
|
3 | 1 2 | ndxid | |- +g = Slot ( +g ` ndx ) |