Theorem bj-alexim 34073

Description: Closed form of aleximi 1833. Note: this proof is shorter, so aleximi 1833 could be deduced from it (exim 1835 would have to be proved first, see bj-eximALT 34087 but its proof is shorter (currently almost a subproof of aleximi 1833)). (Contributed by BJ, 8-Nov-2021.)

Assertion

Ref	Expression
bj-alexim	⊢ (∀𝑥(𝜑 → (𝜓 → 𝜒)) → (∀𝑥𝜑 → (∃𝑥𝜓 → ∃𝑥𝜒)))

Proof of Theorem bj-alexim

Step	Hyp	Ref	Expression
1		alim 1812	. 2 ⊢ (∀𝑥(𝜑 → (𝜓 → 𝜒)) → (∀𝑥𝜑 → ∀𝑥(𝜓 → 𝜒)))
2		exim 1835	. 2 ⊢ (∀𝑥(𝜓 → 𝜒) → (∃𝑥𝜓 → ∃𝑥𝜒))
3	1, 2	syl6 35	1 ⊢ (∀𝑥(𝜑 → (𝜓 → 𝜒)) → (∀𝑥𝜑 → (∃𝑥𝜓 → ∃𝑥𝜒)))

Syntax hints:   → wi 4  ∀wal 1536  ∃wex 1781

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811

This theorem depends on definitions:  df-bi 210  df-ex 1782

This theorem is referenced by:  bj-exalim  34078  bj-cbveximt  34086