Theorem alrimdd 2203

Description: Deduction form of Theorem 19.21 of [Margaris] p. 90, see 19.21 2196. (Contributed by Mario Carneiro, 24-Sep-2016.)

Hypotheses

Ref	Expression
alrimdd.1	⊢ Ⅎ𝑥𝜑
alrimdd.2	⊢ (𝜑 → Ⅎ𝑥𝜓)
alrimdd.3	⊢ (𝜑 → (𝜓 → 𝜒))

Assertion

Ref	Expression
alrimdd	⊢ (𝜑 → (𝜓 → ∀𝑥𝜒))

Proof of Theorem alrimdd

Step	Hyp	Ref	Expression
1		alrimdd.2	. . 3 ⊢ (𝜑 → Ⅎ𝑥𝜓)
2	1	nf5rd 2185	. 2 ⊢ (𝜑 → (𝜓 → ∀𝑥𝜓))
3		alrimdd.1	. . 3 ⊢ Ⅎ𝑥𝜑
4		alrimdd.3	. . 3 ⊢ (𝜑 → (𝜓 → 𝜒))
5	3, 4	alimd 2201	. 2 ⊢ (𝜑 → (∀𝑥𝜓 → ∀𝑥𝜒))
6	2, 5	syld 47	1 ⊢ (𝜑 → (𝜓 → ∀𝑥𝜒))

Syntax hints:   → wi 4  ∀wal 1532  Ⅎwnf 1778

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1790  ax-4 1804  ax-5 1906  ax-6 1964  ax-7 2004  ax-12 2167

This theorem depends on definitions:  df-bi 206  df-ex 1775  df-nf 1779

This theorem is referenced by:  alrimd  2204  wl-euequf  37269