Theorem bj-nnf-alrim 36721

Description: Proof of the closed form of alrimi 2214 from modalK (compare alrimiv 1926). See also bj-alrim 36659. Actually, most proofs between 19.3t 2202 and 2sbbid 2248 could be proved without ax-12 2178. (Contributed by BJ, 20-Aug-2023.)

Assertion

Ref	Expression
bj-nnf-alrim	⊢ (Ⅎ'𝑥𝜑 → (∀𝑥(𝜑 → 𝜓) → (𝜑 → ∀𝑥𝜓)))

Proof of Theorem bj-nnf-alrim

Step	Hyp	Ref	Expression
1		bj-nnfa 36694	. 2 ⊢ (Ⅎ'𝑥𝜑 → (𝜑 → ∀𝑥𝜑))
2		alim 1808	. 2 ⊢ (∀𝑥(𝜑 → 𝜓) → (∀𝑥𝜑 → ∀𝑥𝜓))
3	1, 2	syl9 77	1 ⊢ (Ⅎ'𝑥𝜑 → (∀𝑥(𝜑 → 𝜓) → (𝜑 → ∀𝑥𝜓)))

Syntax hints:   → wi 4  ∀wal 1535  Ⅎ'wnnf 36689

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-4 1807

This theorem depends on definitions:  df-bi 207  df-an 396  df-bj-nnf 36690

This theorem is referenced by:  bj-stdpc5t  36734  bj-19.21t  36735