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Theorem elnp 9794
 Description: Membership in positive reals. (Contributed by NM, 16-Feb-1996.) (New usage is discouraged.)
Assertion
Ref Expression
elnp (𝐴P ↔ ((∅ ⊊ 𝐴𝐴Q) ∧ ∀𝑥𝐴 (∀𝑦(𝑦 <Q 𝑥𝑦𝐴) ∧ ∃𝑦𝐴 𝑥 <Q 𝑦)))
Distinct variable group:   𝑥,𝑦,𝐴

Proof of Theorem elnp
Dummy variable 𝑧 is distinct from all other variables.
StepHypRef Expression
1 elex 3207 . 2 (𝐴P𝐴 ∈ V)
2 pssss 3694 . . . 4 (𝐴Q𝐴Q)
3 nqex 9730 . . . . 5 Q ∈ V
43ssex 4793 . . . 4 (𝐴Q𝐴 ∈ V)
52, 4syl 17 . . 3 (𝐴Q𝐴 ∈ V)
65ad2antlr 762 . 2 (((∅ ⊊ 𝐴𝐴Q) ∧ ∀𝑥𝐴 (∀𝑦(𝑦 <Q 𝑥𝑦𝐴) ∧ ∃𝑦𝐴 𝑥 <Q 𝑦)) → 𝐴 ∈ V)
7 psseq2 3687 . . . . 5 (𝑧 = 𝐴 → (∅ ⊊ 𝑧 ↔ ∅ ⊊ 𝐴))
8 psseq1 3686 . . . . 5 (𝑧 = 𝐴 → (𝑧Q𝐴Q))
97, 8anbi12d 746 . . . 4 (𝑧 = 𝐴 → ((∅ ⊊ 𝑧𝑧Q) ↔ (∅ ⊊ 𝐴𝐴Q)))
10 eleq2 2688 . . . . . . . 8 (𝑧 = 𝐴 → (𝑦𝑧𝑦𝐴))
1110imbi2d 330 . . . . . . 7 (𝑧 = 𝐴 → ((𝑦 <Q 𝑥𝑦𝑧) ↔ (𝑦 <Q 𝑥𝑦𝐴)))
1211albidv 1847 . . . . . 6 (𝑧 = 𝐴 → (∀𝑦(𝑦 <Q 𝑥𝑦𝑧) ↔ ∀𝑦(𝑦 <Q 𝑥𝑦𝐴)))
13 rexeq 3134 . . . . . 6 (𝑧 = 𝐴 → (∃𝑦𝑧 𝑥 <Q 𝑦 ↔ ∃𝑦𝐴 𝑥 <Q 𝑦))
1412, 13anbi12d 746 . . . . 5 (𝑧 = 𝐴 → ((∀𝑦(𝑦 <Q 𝑥𝑦𝑧) ∧ ∃𝑦𝑧 𝑥 <Q 𝑦) ↔ (∀𝑦(𝑦 <Q 𝑥𝑦𝐴) ∧ ∃𝑦𝐴 𝑥 <Q 𝑦)))
1514raleqbi1dv 3141 . . . 4 (𝑧 = 𝐴 → (∀𝑥𝑧 (∀𝑦(𝑦 <Q 𝑥𝑦𝑧) ∧ ∃𝑦𝑧 𝑥 <Q 𝑦) ↔ ∀𝑥𝐴 (∀𝑦(𝑦 <Q 𝑥𝑦𝐴) ∧ ∃𝑦𝐴 𝑥 <Q 𝑦)))
169, 15anbi12d 746 . . 3 (𝑧 = 𝐴 → (((∅ ⊊ 𝑧𝑧Q) ∧ ∀𝑥𝑧 (∀𝑦(𝑦 <Q 𝑥𝑦𝑧) ∧ ∃𝑦𝑧 𝑥 <Q 𝑦)) ↔ ((∅ ⊊ 𝐴𝐴Q) ∧ ∀𝑥𝐴 (∀𝑦(𝑦 <Q 𝑥𝑦𝐴) ∧ ∃𝑦𝐴 𝑥 <Q 𝑦))))
17 df-np 9788 . . 3 P = {𝑧 ∣ ((∅ ⊊ 𝑧𝑧Q) ∧ ∀𝑥𝑧 (∀𝑦(𝑦 <Q 𝑥𝑦𝑧) ∧ ∃𝑦𝑧 𝑥 <Q 𝑦))}
1816, 17elab2g 3347 . 2 (𝐴 ∈ V → (𝐴P ↔ ((∅ ⊊ 𝐴𝐴Q) ∧ ∀𝑥𝐴 (∀𝑦(𝑦 <Q 𝑥𝑦𝐴) ∧ ∃𝑦𝐴 𝑥 <Q 𝑦))))
191, 6, 18pm5.21nii 368 1 (𝐴P ↔ ((∅ ⊊ 𝐴𝐴Q) ∧ ∀𝑥𝐴 (∀𝑦(𝑦 <Q 𝑥𝑦𝐴) ∧ ∃𝑦𝐴 𝑥 <Q 𝑦)))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 196   ∧ wa 384  ∀wal 1479   = wceq 1481   ∈ wcel 1988  ∀wral 2909  ∃wrex 2910  Vcvv 3195   ⊆ wss 3567   ⊊ wpss 3568  ∅c0 3907   class class class wbr 4644  Qcnq 9659
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