Description: Utility theorem: index-independent form of df-unif . (Contributed by Thierry Arnoux, 17-Dec-2017)
Ref | Expression | ||
---|---|---|---|
Assertion | unifid | |- UnifSet = Slot ( UnifSet ` ndx ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-unif | |- UnifSet = Slot ; 1 3 |
|
2 | 1nn0 | |- 1 e. NN0 |
|
3 | 3nn | |- 3 e. NN |
|
4 | 2 3 | decnncl | |- ; 1 3 e. NN |
5 | 1 4 | ndxid | |- UnifSet = Slot ( UnifSet ` ndx ) |