Metamath Proof Explorer

Theorem plendx

Description: Index value of the df-ple slot. (Contributed by Mario Carneiro, 14-Aug-2015) (Revised by AV, 9-Sep-2021)

Ref Expression
Assertion plendx 
|- ( le ` ndx ) = ; 1 0

Proof

Step Hyp Ref Expression
1 df-ple 
 |-  le = Slot ; 1 0
2 10nn 
 |-  ; 1 0 e. NN
3 1 2 ndxarg 
 |-  ( le ` ndx ) = ; 1 0