Theorem imim3i 65

Description: Inference adding three nested antecedents. (Contributed by NM, 19-Dec-2006.)

Hypothesis

Ref	Expression
imim3i.1	⊢ (𝜑 → (𝜓 → 𝜒))

Assertion

Ref	Expression
imim3i	⊢ ((𝜃 → 𝜑) → ((𝜃 → 𝜓) → (𝜃 → 𝜒)))

Proof of Theorem imim3i

Step	Hyp	Ref	Expression
1		imim3i.1	. . 3 ⊢ (𝜑 → (𝜓 → 𝜒))
2	1	imim2i 17	. 2 ⊢ ((𝜃 → 𝜑) → (𝜃 → (𝜓 → 𝜒)))
3	2	a2d 30	1 ⊢ ((𝜃 → 𝜑) → ((𝜃 → 𝜓) → (𝜃 → 𝜒)))

This proof depends on syntax axioms:   → wi 4

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7

This theorem is used by:  pm2.83  85  pm5.74  273  pm3.43i  478  sbi1  2108  ral2imi  3106  ceqsalt  3490  elabgtOLD  3634  bj-bi3ant  37215  bj-sylggt  37238  bj-ceqsalt0  37552  bj-ceqsalt1  37553  pm10.57  45114  ee33  45263