Metamath Proof Explorer

Theorem plusgid

Description: Utility theorem: index-independent form of df-plusg . (Contributed by NM, 20-Oct-2012)

Ref Expression
Assertion plusgid 
|- +g = Slot ( +g ` ndx )

Proof

Step Hyp Ref Expression
1 df-plusg 
 |-  +g = Slot 2
2 2nn 
 |-  2 e. NN
3 1 2 ndxid 
 |-  +g = Slot ( +g ` ndx )