Metamath Proof Explorer

Theorem mulrndx

Description: Index value of the df-mulr slot. (Contributed by Mario Carneiro, 14-Aug-2015)

Ref Expression
Assertion mulrndx 
|- ( .r ` ndx ) = 3

Proof

Step Hyp Ref Expression
1 df-mulr 
 |-  .r = Slot 3
2 3nn 
 |-  3 e. NN
3 1 2 ndxarg 
 |-  ( .r ` ndx ) = 3