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Theorem isfin2-2 9333
Description: FinII expressed in terms of minimal elements. (Contributed by Stefan O'Rear, 2-Nov-2014.) (Proof shortened by Mario Carneiro, 16-May-2015.)
Assertion
Ref Expression
isfin2-2 (𝐴𝑉 → (𝐴 ∈ FinII ↔ ∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦)))
Distinct variable group:   𝑦,𝐴
Allowed substitution hint:   𝑉(𝑦)

Proof of Theorem isfin2-2
Dummy variables 𝑏 𝑐 𝑚 𝑛 𝑤 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 elpwi 4312 . . . 4 (𝑦 ∈ 𝒫 𝒫 𝐴𝑦 ⊆ 𝒫 𝐴)
2 fin2i2 9332 . . . . 5 (((𝐴 ∈ FinII𝑦 ⊆ 𝒫 𝐴) ∧ (𝑦 ≠ ∅ ∧ [] Or 𝑦)) → 𝑦𝑦)
32ex 449 . . . 4 ((𝐴 ∈ FinII𝑦 ⊆ 𝒫 𝐴) → ((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦))
41, 3sylan2 492 . . 3 ((𝐴 ∈ FinII𝑦 ∈ 𝒫 𝒫 𝐴) → ((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦))
54ralrimiva 3104 . 2 (𝐴 ∈ FinII → ∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦))
6 elpwi 4312 . . . . 5 (𝑏 ∈ 𝒫 𝒫 𝐴𝑏 ⊆ 𝒫 𝐴)
7 simp1r 1241 . . . . . . . 8 (((𝐴𝑉𝑏 ⊆ 𝒫 𝐴) ∧ ∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦) ∧ (𝑏 ≠ ∅ ∧ [] Or 𝑏)) → 𝑏 ⊆ 𝒫 𝐴)
8 ssrab2 3828 . . . . . . . . . . 11 {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} ⊆ 𝒫 𝐴
9 simp1l 1240 . . . . . . . . . . . 12 (((𝐴𝑉𝑏 ⊆ 𝒫 𝐴) ∧ ∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦) ∧ (𝑏 ≠ ∅ ∧ [] Or 𝑏)) → 𝐴𝑉)
10 pwexg 4999 . . . . . . . . . . . 12 (𝐴𝑉 → 𝒫 𝐴 ∈ V)
11 elpw2g 4976 . . . . . . . . . . . 12 (𝒫 𝐴 ∈ V → ({𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} ∈ 𝒫 𝒫 𝐴 ↔ {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} ⊆ 𝒫 𝐴))
129, 10, 113syl 18 . . . . . . . . . . 11 (((𝐴𝑉𝑏 ⊆ 𝒫 𝐴) ∧ ∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦) ∧ (𝑏 ≠ ∅ ∧ [] Or 𝑏)) → ({𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} ∈ 𝒫 𝒫 𝐴 ↔ {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} ⊆ 𝒫 𝐴))
138, 12mpbiri 248 . . . . . . . . . 10 (((𝐴𝑉𝑏 ⊆ 𝒫 𝐴) ∧ ∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦) ∧ (𝑏 ≠ ∅ ∧ [] Or 𝑏)) → {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} ∈ 𝒫 𝒫 𝐴)
14 simp2 1132 . . . . . . . . . 10 (((𝐴𝑉𝑏 ⊆ 𝒫 𝐴) ∧ ∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦) ∧ (𝑏 ≠ ∅ ∧ [] Or 𝑏)) → ∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦))
15 simp3l 1244 . . . . . . . . . . . 12 (((𝐴𝑉𝑏 ⊆ 𝒫 𝐴) ∧ ∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦) ∧ (𝑏 ≠ ∅ ∧ [] Or 𝑏)) → 𝑏 ≠ ∅)
16 fin23lem7 9330 . . . . . . . . . . . 12 ((𝐴𝑉𝑏 ⊆ 𝒫 𝐴𝑏 ≠ ∅) → {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} ≠ ∅)
179, 7, 15, 16syl3anc 1477 . . . . . . . . . . 11 (((𝐴𝑉𝑏 ⊆ 𝒫 𝐴) ∧ ∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦) ∧ (𝑏 ≠ ∅ ∧ [] Or 𝑏)) → {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} ≠ ∅)
18 sorpsscmpl 7113 . . . . . . . . . . . . 13 ( [] Or 𝑏 → [] Or {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏})
1918adantl 473 . . . . . . . . . . . 12 ((𝑏 ≠ ∅ ∧ [] Or 𝑏) → [] Or {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏})
20193ad2ant3 1130 . . . . . . . . . . 11 (((𝐴𝑉𝑏 ⊆ 𝒫 𝐴) ∧ ∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦) ∧ (𝑏 ≠ ∅ ∧ [] Or 𝑏)) → [] Or {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏})
2117, 20jca 555 . . . . . . . . . 10 (((𝐴𝑉𝑏 ⊆ 𝒫 𝐴) ∧ ∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦) ∧ (𝑏 ≠ ∅ ∧ [] Or 𝑏)) → ({𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} ≠ ∅ ∧ [] Or {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏}))
22 neeq1 2994 . . . . . . . . . . . . 13 (𝑦 = {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} → (𝑦 ≠ ∅ ↔ {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} ≠ ∅))
23 soeq2 5207 . . . . . . . . . . . . 13 (𝑦 = {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} → ( [] Or 𝑦 ↔ [] Or {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏}))
2422, 23anbi12d 749 . . . . . . . . . . . 12 (𝑦 = {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} → ((𝑦 ≠ ∅ ∧ [] Or 𝑦) ↔ ({𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} ≠ ∅ ∧ [] Or {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏})))
25 inteq 4630 . . . . . . . . . . . . 13 (𝑦 = {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} → 𝑦 = {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏})
26 id 22 . . . . . . . . . . . . 13 (𝑦 = {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} → 𝑦 = {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏})
2725, 26eleq12d 2833 . . . . . . . . . . . 12 (𝑦 = {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} → ( 𝑦𝑦 {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} ∈ {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏}))
2824, 27imbi12d 333 . . . . . . . . . . 11 (𝑦 = {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} → (((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦) ↔ (({𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} ≠ ∅ ∧ [] Or {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏}) → {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} ∈ {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏})))
2928rspcv 3445 . . . . . . . . . 10 ({𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} ∈ 𝒫 𝒫 𝐴 → (∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦) → (({𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} ≠ ∅ ∧ [] Or {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏}) → {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} ∈ {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏})))
3013, 14, 21, 29syl3c 66 . . . . . . . . 9 (((𝐴𝑉𝑏 ⊆ 𝒫 𝐴) ∧ ∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦) ∧ (𝑏 ≠ ∅ ∧ [] Or 𝑏)) → {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} ∈ {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏})
31 sorpssint 7112 . . . . . . . . . 10 ( [] Or {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} → (∃𝑧 ∈ {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏}∀𝑤 ∈ {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} ¬ 𝑤𝑧 {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} ∈ {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏}))
3220, 31syl 17 . . . . . . . . 9 (((𝐴𝑉𝑏 ⊆ 𝒫 𝐴) ∧ ∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦) ∧ (𝑏 ≠ ∅ ∧ [] Or 𝑏)) → (∃𝑧 ∈ {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏}∀𝑤 ∈ {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} ¬ 𝑤𝑧 {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} ∈ {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏}))
3330, 32mpbird 247 . . . . . . . 8 (((𝐴𝑉𝑏 ⊆ 𝒫 𝐴) ∧ ∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦) ∧ (𝑏 ≠ ∅ ∧ [] Or 𝑏)) → ∃𝑧 ∈ {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏}∀𝑤 ∈ {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} ¬ 𝑤𝑧)
34 psseq1 3836 . . . . . . . . 9 (𝑚 = (𝐴𝑧) → (𝑚𝑛 ↔ (𝐴𝑧) ⊊ 𝑛))
35 psseq1 3836 . . . . . . . . 9 (𝑤 = (𝐴𝑛) → (𝑤𝑧 ↔ (𝐴𝑛) ⊊ 𝑧))
36 pssdifcom1 4198 . . . . . . . . 9 ((𝑧𝐴𝑛𝐴) → ((𝐴𝑧) ⊊ 𝑛 ↔ (𝐴𝑛) ⊊ 𝑧))
3734, 35, 36fin23lem11 9331 . . . . . . . 8 (𝑏 ⊆ 𝒫 𝐴 → (∃𝑧 ∈ {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏}∀𝑤 ∈ {𝑐 ∈ 𝒫 𝐴 ∣ (𝐴𝑐) ∈ 𝑏} ¬ 𝑤𝑧 → ∃𝑚𝑏𝑛𝑏 ¬ 𝑚𝑛))
387, 33, 37sylc 65 . . . . . . 7 (((𝐴𝑉𝑏 ⊆ 𝒫 𝐴) ∧ ∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦) ∧ (𝑏 ≠ ∅ ∧ [] Or 𝑏)) → ∃𝑚𝑏𝑛𝑏 ¬ 𝑚𝑛)
39 simp3r 1245 . . . . . . . 8 (((𝐴𝑉𝑏 ⊆ 𝒫 𝐴) ∧ ∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦) ∧ (𝑏 ≠ ∅ ∧ [] Or 𝑏)) → [] Or 𝑏)
40 sorpssuni 7111 . . . . . . . 8 ( [] Or 𝑏 → (∃𝑚𝑏𝑛𝑏 ¬ 𝑚𝑛 𝑏𝑏))
4139, 40syl 17 . . . . . . 7 (((𝐴𝑉𝑏 ⊆ 𝒫 𝐴) ∧ ∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦) ∧ (𝑏 ≠ ∅ ∧ [] Or 𝑏)) → (∃𝑚𝑏𝑛𝑏 ¬ 𝑚𝑛 𝑏𝑏))
4238, 41mpbid 222 . . . . . 6 (((𝐴𝑉𝑏 ⊆ 𝒫 𝐴) ∧ ∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦) ∧ (𝑏 ≠ ∅ ∧ [] Or 𝑏)) → 𝑏𝑏)
43423exp 1113 . . . . 5 ((𝐴𝑉𝑏 ⊆ 𝒫 𝐴) → (∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦) → ((𝑏 ≠ ∅ ∧ [] Or 𝑏) → 𝑏𝑏)))
446, 43sylan2 492 . . . 4 ((𝐴𝑉𝑏 ∈ 𝒫 𝒫 𝐴) → (∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦) → ((𝑏 ≠ ∅ ∧ [] Or 𝑏) → 𝑏𝑏)))
4544ralrimdva 3107 . . 3 (𝐴𝑉 → (∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦) → ∀𝑏 ∈ 𝒫 𝒫 𝐴((𝑏 ≠ ∅ ∧ [] Or 𝑏) → 𝑏𝑏)))
46 isfin2 9308 . . 3 (𝐴𝑉 → (𝐴 ∈ FinII ↔ ∀𝑏 ∈ 𝒫 𝒫 𝐴((𝑏 ≠ ∅ ∧ [] Or 𝑏) → 𝑏𝑏)))
4745, 46sylibrd 249 . 2 (𝐴𝑉 → (∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦) → 𝐴 ∈ FinII))
485, 47impbid2 216 1 (𝐴𝑉 → (𝐴 ∈ FinII ↔ ∀𝑦 ∈ 𝒫 𝒫 𝐴((𝑦 ≠ ∅ ∧ [] Or 𝑦) → 𝑦𝑦)))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 196  wa 383  w3a 1072   = wceq 1632  wcel 2139  wne 2932  wral 3050  wrex 3051  {crab 3054  Vcvv 3340  cdif 3712  wss 3715  wpss 3716  c0 4058  𝒫 cpw 4302   cuni 4588   cint 4627   Or wor 5186   [] crpss 7101  FinIIcfin2 9293
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1871  ax-4 1886  ax-5 1988  ax-6 2054  ax-7 2090  ax-8 2141  ax-9 2148  ax-10 2168  ax-11 2183  ax-12 2196  ax-13 2391  ax-ext 2740  ax-sep 4933  ax-nul 4941  ax-pow 4992  ax-pr 5055  ax-un 7114
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3or 1073  df-3an 1074  df-tru 1635  df-ex 1854  df-nf 1859  df-sb 2047  df-eu 2611  df-mo 2612  df-clab 2747  df-cleq 2753  df-clel 2756  df-nfc 2891  df-ne 2933  df-ral 3055  df-rex 3056  df-rab 3059  df-v 3342  df-dif 3718  df-un 3720  df-in 3722  df-ss 3729  df-pss 3731  df-nul 4059  df-if 4231  df-pw 4304  df-sn 4322  df-pr 4324  df-op 4328  df-uni 4589  df-int 4628  df-br 4805  df-opab 4865  df-po 5187  df-so 5188  df-xp 5272  df-rel 5273  df-rpss 7102  df-fin2 9300
This theorem is referenced by: (None)
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