Theorem abexssex 7936

Description: Existence of a class abstraction with an existentially quantified expression. Both 𝑥 and 𝑦 can be free in 𝜑. (Contributed by NM, 29-Jul-2006.)

Hypotheses

Ref	Expression
abrexex2.1	⊢ 𝐴 ∈ V
abrexex2.2	⊢ {𝑦 ∣ 𝜑} ∈ V

Assertion

Ref	Expression
abexssex	⊢ {𝑦 ∣ ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝜑)} ∈ V

Distinct variable group:   𝑥,𝑦,𝐴

Allowed substitution hints:   𝜑(𝑥,𝑦)

Proof of Theorem abexssex

Step	Hyp	Ref	Expression
1		df-rex 3077	. . . 4 ⊢ (∃𝑥 ∈ 𝒫 𝐴𝜑 ↔ ∃𝑥(𝑥 ∈ 𝒫 𝐴 ∧ 𝜑))
2		velpw 4550	. . . . . 6 ⊢ (𝑥 ∈ 𝒫 𝐴 ↔ 𝑥 ⊆ 𝐴)
3	2	anbi1i 632	. . . . 5 ⊢ ((𝑥 ∈ 𝒫 𝐴 ∧ 𝜑) ↔ (𝑥 ⊆ 𝐴 ∧ 𝜑))
4	3	exbii 1858	. . . 4 ⊢ (∃𝑥(𝑥 ∈ 𝒫 𝐴 ∧ 𝜑) ↔ ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝜑))
5	1, 4	bitri 277	. . 3 ⊢ (∃𝑥 ∈ 𝒫 𝐴𝜑 ↔ ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝜑))
6	5	abbii 2819	. 2 ⊢ {𝑦 ∣ ∃𝑥 ∈ 𝒫 𝐴𝜑} = {𝑦 ∣ ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝜑)}
7		abrexex2.1	. . . 4 ⊢ 𝐴 ∈ V
8	7	pwex 5327	. . 3 ⊢ 𝒫 𝐴 ∈ V
9		abrexex2.2	. . 3 ⊢ {𝑦 ∣ 𝜑} ∈ V
10	8, 9	abrexex2 7935	. 2 ⊢ {𝑦 ∣ ∃𝑥 ∈ 𝒫 𝐴𝜑} ∈ V
11	6, 10	eqeltrri 2849	1 ⊢ {𝑦 ∣ ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝜑)} ∈ V

Syntax hints:   ∧ wa 398  ∃wex 1789   ∈ wcel 2132  {cab 2730  ∃wrex 3076  Vcvv 3444   ⊆ wss 3895  𝒫 cpw 4545

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1805  ax-4 1819  ax-5 1920  ax-6 1977  ax-7 2018  ax-8 2134  ax-9 2142  ax-10 2165  ax-11 2181  ax-12 2202  ax-ext 2724  ax-rep 5217  ax-sep 5236  ax-pow 5312  ax-un 7703

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 857  df-tru 1553  df-ex 1790  df-nf 1794  df-sb 2081  df-mo 2556  df-clab 2731  df-cleq 2744  df-clel 2827  df-nfc 2901  df-ral 3067  df-rex 3077  df-v 3446  df-ss 3912  df-pw 4547  df-uni 4856  df-iun 4941

This theorem is referenced by: (None)