Theorem r19.40 3275

Description: Restricted quantifier version of Theorem 19.40 of [Margaris] p. 90. (Contributed by NM, 2-Apr-2004.)

Assertion

Ref	Expression
r19.40	⊢ (∃𝑥 ∈ 𝐴 (𝜑 ∧ 𝜓) → (∃𝑥 ∈ 𝐴 𝜑 ∧ ∃𝑥 ∈ 𝐴 𝜓))

Proof of Theorem r19.40

Step	Hyp	Ref	Expression
1		simpl 483	. . 3 ⊢ ((𝜑 ∧ 𝜓) → 𝜑)
2	1	reximi 3178	. 2 ⊢ (∃𝑥 ∈ 𝐴 (𝜑 ∧ 𝜓) → ∃𝑥 ∈ 𝐴 𝜑)
3		simpr 485	. . 3 ⊢ ((𝜑 ∧ 𝜓) → 𝜓)
4	3	reximi 3178	. 2 ⊢ (∃𝑥 ∈ 𝐴 (𝜑 ∧ 𝜓) → ∃𝑥 ∈ 𝐴 𝜓)
5	2, 4	jca 512	1 ⊢ (∃𝑥 ∈ 𝐴 (𝜑 ∧ 𝜓) → (∃𝑥 ∈ 𝐴 𝜑 ∧ ∃𝑥 ∈ 𝐴 𝜓))

Syntax hints:   → wi 4   ∧ wa 396  ∃wrex 3065

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812

This theorem depends on definitions:  df-bi 206  df-an 397  df-ex 1783  df-rex 3070

This theorem is referenced by:  rexanuz  15057  txflf  23157  metequiv2  23666  mzpcompact2lem  40573