Theorem rexlimiva 2422

Description: Inference from Theorem 19.23 of [Margaris] p. 90 (restricted quantifier version). (Contributed by NM, 18-Dec-2006.)

Hypothesis

Ref	Expression
rexlimiva.1	⊢ ((x ∈ A ∧ φ) → ψ)

Assertion

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

Distinct variable group:   ψ,x

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

Proof of Theorem rexlimiva

Step	Hyp	Ref	Expression
1		rexlimiva.1	. . 3 ⊢ ((x ∈ A ∧ φ) → ψ)
2	1	ex 108	. 2 ⊢ (x ∈ A → (φ → ψ))
3	2	rexlimiv 2421	1 ⊢ (∃x ∈ A φ → ψ)

Syntax hints:   → wi 4   ∧ wa 97   ∈ wcel 1390  ∃wrex 2301

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-5 1333  ax-gen 1335  ax-ie1 1379  ax-ie2 1380  ax-4 1397  ax-17 1416  ax-ial 1424  ax-i5r 1425

This theorem depends on definitions:  df-bi 110  df-nf 1347  df-ral 2305  df-rex 2306

This theorem is referenced by:  unon  4202  ssfiexmid  6254  dmaddpqlem  6361  nqpi  6362  nq0nn  6425  recexprlemm  6596  bj-nn0suc  9424  bj-nn0sucALT  9438