Metamath Proof Explorer


Theorem dfvd2anir

Description: Right-to-left inference form of dfvd2an . (Contributed by Alan Sare, 23-Apr-2015) (Proof modification is discouraged.) (New usage is discouraged.)

Ref Expression
Hypothesis dfvd2anir.1 φψχ
Assertion dfvd2anir φψχ

Proof

Step Hyp Ref Expression
1 dfvd2anir.1 φψχ
2 dfvd2an φψχφψχ
3 1 2 mpbir φψχ