Metamath Proof Explorer


Theorem alrimdv

Description: Deduction form of Theorem 19.21 of Margaris p. 90. See 19.21 and 19.21v . (Contributed by NM, 10-Feb-1997)

Ref Expression
Hypothesis alrimdv.1 φψχ
Assertion alrimdv φψxχ

Proof

Step Hyp Ref Expression
1 alrimdv.1 φψχ
2 ax-5 φxφ
3 ax-5 ψxψ
4 2 3 1 alrimdh φψxχ