Theorem r19.29vvaOLD 3204

Description: Obsolete version of r19.29vva 3203 as of 4-Nov-2024. (Contributed by Thierry Arnoux, 26-Nov-2017.) (Proof shortened by Wolf Lammen, 29-Jun-2023.) (Proof modification is discouraged.) (New usage is discouraged.)

Hypotheses

Ref	Expression
r19.29vva.1	⊢ ((((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝑦 ∈ 𝐵) ∧ 𝜓) → 𝜒)
r19.29vva.2	⊢ (𝜑 → ∃𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝜓)

Assertion

Ref	Expression
r19.29vvaOLD	⊢ (𝜑 → 𝜒)

Distinct variable groups:   𝑦,𝐴   𝑥,𝑦,𝜒   𝜑,𝑥,𝑦

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

Proof of Theorem r19.29vvaOLD

Step	Hyp	Ref	Expression
1		r19.29vva.1	. . 3 ⊢ ((((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝑦 ∈ 𝐵) ∧ 𝜓) → 𝜒)
2		r19.29vva.2	. . 3 ⊢ (𝜑 → ∃𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝜓)
3	1, 2	reximddv2 3202	. 2 ⊢ (𝜑 → ∃𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝜒)
4		id 22	. . . 4 ⊢ (𝜒 → 𝜒)
5	4	rexlimivw 3138	. . 3 ⊢ (∃𝑦 ∈ 𝐵 𝜒 → 𝜒)
6	5	reximi 3073	. 2 ⊢ (∃𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝜒 → ∃𝑥 ∈ 𝐴 𝜒)
7	4	rexlimivw 3138	. 2 ⊢ (∃𝑥 ∈ 𝐴 𝜒 → 𝜒)
8	3, 6, 7	3syl 18	1 ⊢ (𝜑 → 𝜒)

Syntax hints:   → wi 4   ∧ wa 395   ∈ wcel 2107  ∃wrex 3059

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1794  ax-4 1808  ax-5 1909

This theorem depends on definitions:  df-bi 207  df-an 396  df-ex 1779  df-rex 3060

This theorem is referenced by: (None)