Metamath Proof Explorer


Theorem iidn3

Description: idn3 without virtual deduction connectives. Special theorem needed for the Virtual Deduction translation tool. (Contributed by Alan Sare, 23-Jul-2011) (Proof modification is discouraged.) (New usage is discouraged.)

Ref Expression
Assertion iidn3 ( 𝜑 → ( 𝜓 → ( 𝜒𝜒 ) ) )

Proof

Step Hyp Ref Expression
1 id ( 𝜒𝜒 )
2 1 2a1i ( 𝜑 → ( 𝜓 → ( 𝜒𝜒 ) ) )