Metamath Proof Explorer


Definition df-mty

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

Ref Expression
Assertion df-mty mType = Slot 3

Detailed syntax breakdown

Step Hyp Ref Expression
0 cmty class mType
1 c3 class 3
2 1 cslot class Slot 3
3 0 2 wceq wff mType = Slot 3