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Theorem suplem1pr 9753
 Description: The union of a nonempty, bounded set of positive reals is a positive real. Part of Proposition 9-3.3 of [Gleason] p. 122. (Contributed by NM, 19-May-1996.) (Revised by Mario Carneiro, 12-Jun-2013.) (New usage is discouraged.)
Assertion
Ref Expression
suplem1pr ((𝐴 ≠ ∅ ∧ ∃𝑥P𝑦𝐴 𝑦<P 𝑥) → 𝐴P)
Distinct variable group:   𝑥,𝑦,𝐴

Proof of Theorem suplem1pr
Dummy variable 𝑧 is distinct from all other variables.
StepHypRef Expression
1 ltrelpr 9699 . . . . . . . . 9 <P ⊆ (P × P)
21brel 5090 . . . . . . . 8 (𝑦<P 𝑥 → (𝑦P𝑥P))
32simpld 474 . . . . . . 7 (𝑦<P 𝑥𝑦P)
43ralimi 2936 . . . . . 6 (∀𝑦𝐴 𝑦<P 𝑥 → ∀𝑦𝐴 𝑦P)
5 dfss3 3558 . . . . . 6 (𝐴P ↔ ∀𝑦𝐴 𝑦P)
64, 5sylibr 223 . . . . 5 (∀𝑦𝐴 𝑦<P 𝑥𝐴P)
76rexlimivw 3011 . . . 4 (∃𝑥P𝑦𝐴 𝑦<P 𝑥𝐴P)
87adantl 481 . . 3 ((𝐴 ≠ ∅ ∧ ∃𝑥P𝑦𝐴 𝑦<P 𝑥) → 𝐴P)
9 n0 3890 . . . . 5 (𝐴 ≠ ∅ ↔ ∃𝑧 𝑧𝐴)
10 ssel 3562 . . . . . . 7 (𝐴P → (𝑧𝐴𝑧P))
11 prn0 9690 . . . . . . . . . 10 (𝑧P𝑧 ≠ ∅)
12 0pss 3965 . . . . . . . . . 10 (∅ ⊊ 𝑧𝑧 ≠ ∅)
1311, 12sylibr 223 . . . . . . . . 9 (𝑧P → ∅ ⊊ 𝑧)
14 elssuni 4403 . . . . . . . . 9 (𝑧𝐴𝑧 𝐴)
15 psssstr 3675 . . . . . . . . 9 ((∅ ⊊ 𝑧𝑧 𝐴) → ∅ ⊊ 𝐴)
1613, 14, 15syl2an 493 . . . . . . . 8 ((𝑧P𝑧𝐴) → ∅ ⊊ 𝐴)
1716expcom 450 . . . . . . 7 (𝑧𝐴 → (𝑧P → ∅ ⊊ 𝐴))
1810, 17sylcom 30 . . . . . 6 (𝐴P → (𝑧𝐴 → ∅ ⊊ 𝐴))
1918exlimdv 1848 . . . . 5 (𝐴P → (∃𝑧 𝑧𝐴 → ∅ ⊊ 𝐴))
209, 19syl5bi 231 . . . 4 (𝐴P → (𝐴 ≠ ∅ → ∅ ⊊ 𝐴))
21 prpssnq 9691 . . . . . . 7 (𝑥P𝑥Q)
2221adantl 481 . . . . . 6 ((𝐴P𝑥P) → 𝑥Q)
23 ltprord 9731 . . . . . . . . . 10 ((𝑦P𝑥P) → (𝑦<P 𝑥𝑦𝑥))
24 pssss 3664 . . . . . . . . . 10 (𝑦𝑥𝑦𝑥)
2523, 24syl6bi 242 . . . . . . . . 9 ((𝑦P𝑥P) → (𝑦<P 𝑥𝑦𝑥))
262, 25mpcom 37 . . . . . . . 8 (𝑦<P 𝑥𝑦𝑥)
2726ralimi 2936 . . . . . . 7 (∀𝑦𝐴 𝑦<P 𝑥 → ∀𝑦𝐴 𝑦𝑥)
28 unissb 4405 . . . . . . 7 ( 𝐴𝑥 ↔ ∀𝑦𝐴 𝑦𝑥)
2927, 28sylibr 223 . . . . . 6 (∀𝑦𝐴 𝑦<P 𝑥 𝐴𝑥)
30 sspsstr 3674 . . . . . . 7 (( 𝐴𝑥𝑥Q) → 𝐴Q)
3130expcom 450 . . . . . 6 (𝑥Q → ( 𝐴𝑥 𝐴Q))
3222, 29, 31syl2im 39 . . . . 5 ((𝐴P𝑥P) → (∀𝑦𝐴 𝑦<P 𝑥 𝐴Q))
3332rexlimdva 3013 . . . 4 (𝐴P → (∃𝑥P𝑦𝐴 𝑦<P 𝑥 𝐴Q))
3420, 33anim12d 584 . . 3 (𝐴P → ((𝐴 ≠ ∅ ∧ ∃𝑥P𝑦𝐴 𝑦<P 𝑥) → (∅ ⊊ 𝐴 𝐴Q)))
358, 34mpcom 37 . 2 ((𝐴 ≠ ∅ ∧ ∃𝑥P𝑦𝐴 𝑦<P 𝑥) → (∅ ⊊ 𝐴 𝐴Q))
36 prcdnq 9694 . . . . . . . . . . . . 13 ((𝑧P𝑥𝑧) → (𝑦 <Q 𝑥𝑦𝑧))
3736ex 449 . . . . . . . . . . . 12 (𝑧P → (𝑥𝑧 → (𝑦 <Q 𝑥𝑦𝑧)))
3837com3r 85 . . . . . . . . . . 11 (𝑦 <Q 𝑥 → (𝑧P → (𝑥𝑧𝑦𝑧)))
3910, 38sylan9 687 . . . . . . . . . 10 ((𝐴P𝑦 <Q 𝑥) → (𝑧𝐴 → (𝑥𝑧𝑦𝑧)))
4039reximdvai 2998 . . . . . . . . 9 ((𝐴P𝑦 <Q 𝑥) → (∃𝑧𝐴 𝑥𝑧 → ∃𝑧𝐴 𝑦𝑧))
41 eluni2 4376 . . . . . . . . 9 (𝑥 𝐴 ↔ ∃𝑧𝐴 𝑥𝑧)
42 eluni2 4376 . . . . . . . . 9 (𝑦 𝐴 ↔ ∃𝑧𝐴 𝑦𝑧)
4340, 41, 423imtr4g 284 . . . . . . . 8 ((𝐴P𝑦 <Q 𝑥) → (𝑥 𝐴𝑦 𝐴))
4443ex 449 . . . . . . 7 (𝐴P → (𝑦 <Q 𝑥 → (𝑥 𝐴𝑦 𝐴)))
4544com23 84 . . . . . 6 (𝐴P → (𝑥 𝐴 → (𝑦 <Q 𝑥𝑦 𝐴)))
4645alrimdv 1844 . . . . 5 (𝐴P → (𝑥 𝐴 → ∀𝑦(𝑦 <Q 𝑥𝑦 𝐴)))
47 eluni 4375 . . . . . 6 (𝑥 𝐴 ↔ ∃𝑧(𝑥𝑧𝑧𝐴))
48 prnmax 9696 . . . . . . . . . . . . 13 ((𝑧P𝑥𝑧) → ∃𝑦𝑧 𝑥 <Q 𝑦)
4948ex 449 . . . . . . . . . . . 12 (𝑧P → (𝑥𝑧 → ∃𝑦𝑧 𝑥 <Q 𝑦))
5010, 49syl6 34 . . . . . . . . . . 11 (𝐴P → (𝑧𝐴 → (𝑥𝑧 → ∃𝑦𝑧 𝑥 <Q 𝑦)))
5150com23 84 . . . . . . . . . 10 (𝐴P → (𝑥𝑧 → (𝑧𝐴 → ∃𝑦𝑧 𝑥 <Q 𝑦)))
5251imp 444 . . . . . . . . 9 ((𝐴P𝑥𝑧) → (𝑧𝐴 → ∃𝑦𝑧 𝑥 <Q 𝑦))
53 ssrexv 3630 . . . . . . . . . 10 (𝑧 𝐴 → (∃𝑦𝑧 𝑥 <Q 𝑦 → ∃𝑦 𝐴𝑥 <Q 𝑦))
5414, 53syl 17 . . . . . . . . 9 (𝑧𝐴 → (∃𝑦𝑧 𝑥 <Q 𝑦 → ∃𝑦 𝐴𝑥 <Q 𝑦))
5552, 54sylcom 30 . . . . . . . 8 ((𝐴P𝑥𝑧) → (𝑧𝐴 → ∃𝑦 𝐴𝑥 <Q 𝑦))
5655expimpd 627 . . . . . . 7 (𝐴P → ((𝑥𝑧𝑧𝐴) → ∃𝑦 𝐴𝑥 <Q 𝑦))
5756exlimdv 1848 . . . . . 6 (𝐴P → (∃𝑧(𝑥𝑧𝑧𝐴) → ∃𝑦 𝐴𝑥 <Q 𝑦))
5847, 57syl5bi 231 . . . . 5 (𝐴P → (𝑥 𝐴 → ∃𝑦 𝐴𝑥 <Q 𝑦))
5946, 58jcad 554 . . . 4 (𝐴P → (𝑥 𝐴 → (∀𝑦(𝑦 <Q 𝑥𝑦 𝐴) ∧ ∃𝑦 𝐴𝑥 <Q 𝑦)))
6059ralrimiv 2948 . . 3 (𝐴P → ∀𝑥 𝐴(∀𝑦(𝑦 <Q 𝑥𝑦 𝐴) ∧ ∃𝑦 𝐴𝑥 <Q 𝑦))
618, 60syl 17 . 2 ((𝐴 ≠ ∅ ∧ ∃𝑥P𝑦𝐴 𝑦<P 𝑥) → ∀𝑥 𝐴(∀𝑦(𝑦 <Q 𝑥𝑦 𝐴) ∧ ∃𝑦 𝐴𝑥 <Q 𝑦))
62 elnp 9688 . 2 ( 𝐴P ↔ ((∅ ⊊ 𝐴 𝐴Q) ∧ ∀𝑥 𝐴(∀𝑦(𝑦 <Q 𝑥𝑦 𝐴) ∧ ∃𝑦 𝐴𝑥 <Q 𝑦)))
6335, 61, 62sylanbrc 695 1 ((𝐴 ≠ ∅ ∧ ∃𝑥P𝑦𝐴 𝑦<P 𝑥) → 𝐴P)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 383  ∀wal 1473  ∃wex 1695   ∈ wcel 1977   ≠ wne 2780  ∀wral 2896  ∃wrex 2897   ⊆ wss 3540   ⊊ wpss 3541  ∅c0 3874  ∪ cuni 4372   class class class wbr 4583  Qcnq 9553
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