Metamath Proof Explorer


Definition df-mvar

Description: Define the set of variables in a Metamath formal system. (Contributed by Mario Carneiro, 14-Jul-2016)

Ref Expression
Assertion df-mvar mVR = Slot 2

Detailed syntax breakdown

Step Hyp Ref Expression
0 cmvar class mVR
1 c2 class 2
2 1 cslot class Slot 2
3 0 2 wceq wff mVR = Slot 2