Theorem ee211 44683

Description: e211 44682 without virtual deductions. (Contributed by Alan Sare, 13-Jul-2011.) (Proof modification is discouraged.) (New usage is discouraged.)

Hypotheses

Ref	Expression
ee211.1	⊢ (𝜑 → (𝜓 → 𝜒))
ee211.2	⊢ (𝜑 → 𝜃)
ee211.3	⊢ (𝜑 → 𝜏)
ee211.4	⊢ (𝜒 → (𝜃 → (𝜏 → 𝜂)))

Assertion

Ref	Expression
ee211	⊢ (𝜑 → (𝜓 → 𝜂))

Proof of Theorem ee211

Step	Hyp	Ref	Expression
1		ee211.1	. 2 ⊢ (𝜑 → (𝜓 → 𝜒))
2		ee211.2	. . 3 ⊢ (𝜑 → 𝜃)
3	2	a1d 25	. 2 ⊢ (𝜑 → (𝜓 → 𝜃))
4		ee211.3	. . 3 ⊢ (𝜑 → 𝜏)
5	4	a1d 25	. 2 ⊢ (𝜑 → (𝜓 → 𝜏))
6		ee211.4	. 2 ⊢ (𝜒 → (𝜃 → (𝜏 → 𝜂)))
7	1, 3, 5, 6	ee222 44527	1 ⊢ (𝜑 → (𝜓 → 𝜂))

Syntax hints:   → wi 4

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8

This theorem depends on definitions:  df-bi 207  df-an 396

This theorem is referenced by: (None)