Theorem iidn3 42121

Description: idn3 42235 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.)

Assertion

Ref	Expression
iidn3	⊢ (𝜑 → (𝜓 → (𝜒 → 𝜒)))

Proof of Theorem iidn3

Step	Hyp	Ref	Expression
1		id 22	. 2 ⊢ (𝜒 → 𝜒)
2	1	2a1i 12	1 ⊢ (𝜑 → (𝜓 → (𝜒 → 𝜒)))

Syntax hints:   → wi 4

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7

This theorem is referenced by:  trintALT  42501