Theorem reximd2a 3273

Description: Deduction quantifying both antecedent and consequent, based on Theorem 19.22 of [Margaris] p. 90. (Contributed by Thierry Arnoux, 27-Jan-2020.)

Hypotheses

Ref	Expression
reximd2a.1	⊢ Ⅎ𝑥𝜑
reximd2a.2	⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝜓) → 𝑥 ∈ 𝐵)
reximd2a.3	⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝜓) → 𝜒)
reximd2a.4	⊢ (𝜑 → ∃𝑥 ∈ 𝐴 𝜓)

Assertion

Ref	Expression
reximd2a	⊢ (𝜑 → ∃𝑥 ∈ 𝐵 𝜒)

Proof of Theorem reximd2a

Step	Hyp	Ref	Expression
1		reximd2a.4	. 2 ⊢ (𝜑 → ∃𝑥 ∈ 𝐴 𝜓)
2		reximd2a.1	. . . 4 ⊢ Ⅎ𝑥𝜑
3		reximd2a.2	. . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝜓) → 𝑥 ∈ 𝐵)
4		reximd2a.3	. . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝜓) → 𝜒)
5	3, 4	jca 521	. . . . 5 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝜓) → (𝑥 ∈ 𝐵 ∧ 𝜒))
6	5	expl 463	. . . 4 ⊢ (𝜑 → ((𝑥 ∈ 𝐴 ∧ 𝜓) → (𝑥 ∈ 𝐵 ∧ 𝜒)))
7	2, 6	eximd 2253	. . 3 ⊢ (𝜑 → (∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜓) → ∃𝑥(𝑥 ∈ 𝐵 ∧ 𝜒)))
8		df-rex 3088	. . 3 ⊢ (∃𝑥 ∈ 𝐴 𝜓 ↔ ∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜓))
9		df-rex 3088	. . 3 ⊢ (∃𝑥 ∈ 𝐵 𝜒 ↔ ∃𝑥(𝑥 ∈ 𝐵 ∧ 𝜒))
10	7, 8, 9	3imtr4g 299	. 2 ⊢ (𝜑 → (∃𝑥 ∈ 𝐴 𝜓 → ∃𝑥 ∈ 𝐵 𝜒))
11	1, 10	mpd 16	1 ⊢ (𝜑 → ∃𝑥 ∈ 𝐵 𝜒)

This proof depends on syntax axioms:   → wi 4   ∧ wa 401  ∃wex 1812  Ⅎwnf 1816   ∈ wcel 2145  ∃wrex 3087

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-12 2213

This proof depends on definitions:  df-bi 210  df-an 402  df-ex 1813  df-nf 1817  df-rex 3088

This theorem is used by:  exsslsb  34229  locfinreflem  34472