Axiom ax-eqtypi 77

Description: Deduce equality of types from equality of expressions. (This is unnecessary but eliminates a lot of hypotheses.) (New usage is discouraged.) (Contributed by Mario Carneiro, 7-Oct-2014.)

Hypotheses

Ref	Expression
eqcomi.1	|- A:al
eqcomi.2	|- R |= [A = B]

Assertion

Ref	Expression
ax-eqtypi	|- B:al

Detailed syntax breakdown of Axiom ax-eqtypi

Step	Hyp	Ref	Expression
1		hal	. 2 type al
2		tb	. 2 term B
3	1, 2	wffMMJ2t 12	1 wff B:al

This axiom is referenced by:  eqtypi  78