Theorem 2al2imi 41991

Description: Removes two universal quantifiers from a statement. (Contributed by Andrew Salmon, 24-May-2011.)

Hypothesis

Ref	Expression
2al2imi.1	⊢ (𝜑 → (𝜓 → 𝜒))

Assertion

Ref	Expression
2al2imi	⊢ (∀𝑥∀𝑦𝜑 → (∀𝑥∀𝑦𝜓 → ∀𝑥∀𝑦𝜒))

Proof of Theorem 2al2imi

Step	Hyp	Ref	Expression
1		2al2imi.1	. . 3 ⊢ (𝜑 → (𝜓 → 𝜒))
2	1	al2imi 1818	. 2 ⊢ (∀𝑦𝜑 → (∀𝑦𝜓 → ∀𝑦𝜒))
3	2	al2imi 1818	1 ⊢ (∀𝑥∀𝑦𝜑 → (∀𝑥∀𝑦𝜓 → ∀𝑥∀𝑦𝜒))

Syntax hints:   → wi 4  ∀wal 1537

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-gen 1798  ax-4 1812

This theorem is referenced by:  2alim  41995