Theorem rexlimdvw 2742

Description: Inference from Theorem 19.23 of [Margaris] p. 90 (restricted quantifier version). (Contributed by NM, 18-Jun-2014.)

Hypothesis

Ref	Expression
rexlimdvw.1	⊢ (φ → (ψ → χ))

Assertion

Ref	Expression
rexlimdvw	⊢ (φ → (∃x ∈ A ψ → χ))

Distinct variable groups:   φ,x   χ,x

Allowed substitution hints:   ψ(x)   A(x)

Proof of Theorem rexlimdvw

Step	Hyp	Ref	Expression
1		rexlimdvw.1	. . 3 ⊢ (φ → (ψ → χ))
2	1	a1d 22	. 2 ⊢ (φ → (x ∈ A → (ψ → χ)))
3	2	rexlimdv 2738	1 ⊢ (φ → (∃x ∈ A ψ → χ))

This proof depends on syntax axioms:   → wi 4   ∈ wcel 1710  ∃wrex 2616

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-11 1746

This proof depends on definitions:  df-bi 177  df-an 360  df-ex 1542  df-nf 1545  df-ral 2620  df-rex 2621

This theorem is used by:  sfintfin  4533  vfinspsslem1  4551