Theorem bj-nnf-exlim 37840

Description: Proof of the closed form of exlimi 2257 from modalK (compare exlimiv 1965). See also bj-sylget2 37682. (Contributed by BJ, 2-Dec-2023.)

Assertion

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

Proof of Theorem bj-nnf-exlim

Step	Hyp	Ref	Expression
1		exim 1867	. 2 ⊢ (∀𝑥(𝜑 → 𝜓) → (∃𝑥𝜑 → ∃𝑥𝜓))
2		bj-nnfe 37811	. 2 ⊢ (Ⅎ'𝑥𝜓 → (∃𝑥𝜓 → 𝜓))
3	1, 2	syl9r 79	1 ⊢ (Ⅎ'𝑥𝜓 → (∀𝑥(𝜑 → 𝜓) → (∃𝑥𝜑 → 𝜓)))

This proof depends on syntax axioms:   → wi 4  ∀wal 1568  ∃wex 1812  Ⅎ'wnnf 37806

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842

This proof depends on definitions:  df-bi 210  df-an 402  df-ex 1813  df-bj-nnf 37807

This theorem is used by:  bj-19.23t  37842