Theorem 2ralor 3294

Description: Distribute restricted universal quantification over "or". (Contributed by Jeff Madsen, 19-Jun-2010.) (Proof shortened by Wolf Lammen, 20-Nov-2024.)

Assertion

Ref	Expression
2ralor	⊢ (∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐵 (𝜑 ∨ 𝜓) ↔ (∀𝑥 ∈ 𝐴 𝜑 ∨ ∀𝑦 ∈ 𝐵 𝜓))

Distinct variable groups:   𝜑,𝑦   𝜓,𝑥   𝑦,𝐴   𝑥,𝐵   𝑥,𝑦

Allowed substitution hints:   𝜑(𝑥)   𝜓(𝑦)   𝐴(𝑥)   𝐵(𝑦)

Proof of Theorem 2ralor

Step	Hyp	Ref	Expression
1		r19.32v 3267	. . . 4 ⊢ (∀𝑦 ∈ 𝐵 (𝜑 ∨ 𝜓) ↔ (𝜑 ∨ ∀𝑦 ∈ 𝐵 𝜓))
2		orcom 866	. . . 4 ⊢ ((𝜑 ∨ ∀𝑦 ∈ 𝐵 𝜓) ↔ (∀𝑦 ∈ 𝐵 𝜓 ∨ 𝜑))
3	1, 2	bitri 274	. . 3 ⊢ (∀𝑦 ∈ 𝐵 (𝜑 ∨ 𝜓) ↔ (∀𝑦 ∈ 𝐵 𝜓 ∨ 𝜑))
4	3	ralbii 3090	. 2 ⊢ (∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐵 (𝜑 ∨ 𝜓) ↔ ∀𝑥 ∈ 𝐴 (∀𝑦 ∈ 𝐵 𝜓 ∨ 𝜑))
5		r19.32v 3267	. 2 ⊢ (∀𝑥 ∈ 𝐴 (∀𝑦 ∈ 𝐵 𝜓 ∨ 𝜑) ↔ (∀𝑦 ∈ 𝐵 𝜓 ∨ ∀𝑥 ∈ 𝐴 𝜑))
6		orcom 866	. 2 ⊢ ((∀𝑦 ∈ 𝐵 𝜓 ∨ ∀𝑥 ∈ 𝐴 𝜑) ↔ (∀𝑥 ∈ 𝐴 𝜑 ∨ ∀𝑦 ∈ 𝐵 𝜓))
7	4, 5, 6	3bitri 296	1 ⊢ (∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐵 (𝜑 ∨ 𝜓) ↔ (∀𝑥 ∈ 𝐴 𝜑 ∨ ∀𝑦 ∈ 𝐵 𝜓))

Syntax hints:   ↔ wb 205   ∨ wo 843  ∀wral 3063

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914

This theorem depends on definitions:  df-bi 206  df-or 844  df-ex 1784  df-ral 3068

This theorem is referenced by:  prmidl2  31518  ispridl2  36123