Description: Utility theorem: index-independent form of df-mulr . (Contributed by Mario Carneiro, 8-Jun-2013)
Ref | Expression | ||
---|---|---|---|
Assertion | mulrid | ⊢ .r = Slot ( .r ‘ ndx ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-mulr | ⊢ .r = Slot 3 | |
2 | 3nn | ⊢ 3 ∈ ℕ | |
3 | 1 2 | ndxid | ⊢ .r = Slot ( .r ‘ ndx ) |