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Theorem fin1a2lem7 9481
Description: Lemma for fin1a2 9490. Split a III-infinite set in two pieces. (Contributed by Stefan O'Rear, 7-Nov-2014.)
Hypotheses
Ref Expression
fin1a2lem.b 𝐸 = (𝑥 ∈ ω ↦ (2𝑜 ·𝑜 𝑥))
fin1a2lem.aa 𝑆 = (𝑥 ∈ On ↦ suc 𝑥)
Assertion
Ref Expression
fin1a2lem7 ((𝐴𝑉 ∧ ∀𝑦 ∈ 𝒫 𝐴(𝑦 ∈ FinIII ∨ (𝐴𝑦) ∈ FinIII)) → 𝐴 ∈ FinIII)
Distinct variable groups:   𝑦,𝐴   𝑦,𝐸
Allowed substitution hints:   𝐴(𝑥)   𝑆(𝑥,𝑦)   𝐸(𝑥)   𝑉(𝑥,𝑦)

Proof of Theorem fin1a2lem7
Dummy variable 𝑓 is distinct from all other variables.
StepHypRef Expression
1 peano1 7283 . . . . . 6 ∅ ∈ ω
2 ne0i 4085 . . . . . 6 (∅ ∈ ω → ω ≠ ∅)
3 brwdomn0 8681 . . . . . 6 (ω ≠ ∅ → (ω ≼* 𝐴 ↔ ∃𝑓 𝑓:𝐴onto→ω))
41, 2, 3mp2b 10 . . . . 5 (ω ≼* 𝐴 ↔ ∃𝑓 𝑓:𝐴onto→ω)
5 vex 3353 . . . . . . . . . 10 𝑓 ∈ V
6 fof 6298 . . . . . . . . . 10 (𝑓:𝐴onto→ω → 𝑓:𝐴⟶ω)
7 dmfex 7322 . . . . . . . . . 10 ((𝑓 ∈ V ∧ 𝑓:𝐴⟶ω) → 𝐴 ∈ V)
85, 6, 7sylancr 581 . . . . . . . . 9 (𝑓:𝐴onto→ω → 𝐴 ∈ V)
9 cnvimass 5667 . . . . . . . . . 10 (𝑓 “ ran 𝐸) ⊆ dom 𝑓
109, 6fssdm 6239 . . . . . . . . 9 (𝑓:𝐴onto→ω → (𝑓 “ ran 𝐸) ⊆ 𝐴)
118, 10sselpwd 4968 . . . . . . . 8 (𝑓:𝐴onto→ω → (𝑓 “ ran 𝐸) ∈ 𝒫 𝐴)
12 fin1a2lem.b . . . . . . . . . . . . . 14 𝐸 = (𝑥 ∈ ω ↦ (2𝑜 ·𝑜 𝑥))
1312fin1a2lem4 9478 . . . . . . . . . . . . 13 𝐸:ω–1-1→ω
14 f1cnv 6343 . . . . . . . . . . . . 13 (𝐸:ω–1-1→ω → 𝐸:ran 𝐸1-1-onto→ω)
15 f1ofo 6327 . . . . . . . . . . . . 13 (𝐸:ran 𝐸1-1-onto→ω → 𝐸:ran 𝐸onto→ω)
1613, 14, 15mp2b 10 . . . . . . . . . . . 12 𝐸:ran 𝐸onto→ω
17 fofun 6299 . . . . . . . . . . . 12 (𝐸:ran 𝐸onto→ω → Fun 𝐸)
1816, 17ax-mp 5 . . . . . . . . . . 11 Fun 𝐸
195resex 5620 . . . . . . . . . . 11 (𝑓 ↾ (𝑓 “ ran 𝐸)) ∈ V
20 cofunexg 7328 . . . . . . . . . . 11 ((Fun 𝐸 ∧ (𝑓 ↾ (𝑓 “ ran 𝐸)) ∈ V) → (𝐸 ∘ (𝑓 ↾ (𝑓 “ ran 𝐸))) ∈ V)
2118, 19, 20mp2an 683 . . . . . . . . . 10 (𝐸 ∘ (𝑓 ↾ (𝑓 “ ran 𝐸))) ∈ V
22 fofun 6299 . . . . . . . . . . . . 13 (𝑓:𝐴onto→ω → Fun 𝑓)
23 fores 6307 . . . . . . . . . . . . 13 ((Fun 𝑓 ∧ (𝑓 “ ran 𝐸) ⊆ dom 𝑓) → (𝑓 ↾ (𝑓 “ ran 𝐸)):(𝑓 “ ran 𝐸)–onto→(𝑓 “ (𝑓 “ ran 𝐸)))
2422, 9, 23sylancl 580 . . . . . . . . . . . 12 (𝑓:𝐴onto→ω → (𝑓 ↾ (𝑓 “ ran 𝐸)):(𝑓 “ ran 𝐸)–onto→(𝑓 “ (𝑓 “ ran 𝐸)))
25 f1f 6283 . . . . . . . . . . . . . . 15 (𝐸:ω–1-1→ω → 𝐸:ω⟶ω)
26 frn 6229 . . . . . . . . . . . . . . 15 (𝐸:ω⟶ω → ran 𝐸 ⊆ ω)
2713, 25, 26mp2b 10 . . . . . . . . . . . . . 14 ran 𝐸 ⊆ ω
28 foimacnv 6337 . . . . . . . . . . . . . 14 ((𝑓:𝐴onto→ω ∧ ran 𝐸 ⊆ ω) → (𝑓 “ (𝑓 “ ran 𝐸)) = ran 𝐸)
2927, 28mpan2 682 . . . . . . . . . . . . 13 (𝑓:𝐴onto→ω → (𝑓 “ (𝑓 “ ran 𝐸)) = ran 𝐸)
30 foeq3 6296 . . . . . . . . . . . . 13 ((𝑓 “ (𝑓 “ ran 𝐸)) = ran 𝐸 → ((𝑓 ↾ (𝑓 “ ran 𝐸)):(𝑓 “ ran 𝐸)–onto→(𝑓 “ (𝑓 “ ran 𝐸)) ↔ (𝑓 ↾ (𝑓 “ ran 𝐸)):(𝑓 “ ran 𝐸)–onto→ran 𝐸))
3129, 30syl 17 . . . . . . . . . . . 12 (𝑓:𝐴onto→ω → ((𝑓 ↾ (𝑓 “ ran 𝐸)):(𝑓 “ ran 𝐸)–onto→(𝑓 “ (𝑓 “ ran 𝐸)) ↔ (𝑓 ↾ (𝑓 “ ran 𝐸)):(𝑓 “ ran 𝐸)–onto→ran 𝐸))
3224, 31mpbid 223 . . . . . . . . . . 11 (𝑓:𝐴onto→ω → (𝑓 ↾ (𝑓 “ ran 𝐸)):(𝑓 “ ran 𝐸)–onto→ran 𝐸)
33 foco 6308 . . . . . . . . . . 11 ((𝐸:ran 𝐸onto→ω ∧ (𝑓 ↾ (𝑓 “ ran 𝐸)):(𝑓 “ ran 𝐸)–onto→ran 𝐸) → (𝐸 ∘ (𝑓 ↾ (𝑓 “ ran 𝐸))):(𝑓 “ ran 𝐸)–onto→ω)
3416, 32, 33sylancr 581 . . . . . . . . . 10 (𝑓:𝐴onto→ω → (𝐸 ∘ (𝑓 ↾ (𝑓 “ ran 𝐸))):(𝑓 “ ran 𝐸)–onto→ω)
35 fowdom 8683 . . . . . . . . . 10 (((𝐸 ∘ (𝑓 ↾ (𝑓 “ ran 𝐸))) ∈ V ∧ (𝐸 ∘ (𝑓 ↾ (𝑓 “ ran 𝐸))):(𝑓 “ ran 𝐸)–onto→ω) → ω ≼* (𝑓 “ ran 𝐸))
3621, 34, 35sylancr 581 . . . . . . . . 9 (𝑓:𝐴onto→ω → ω ≼* (𝑓 “ ran 𝐸))
375cnvex 7311 . . . . . . . . . . . 12 𝑓 ∈ V
3837imaex 7302 . . . . . . . . . . 11 (𝑓 “ ran 𝐸) ∈ V
39 isfin3-2 9442 . . . . . . . . . . 11 ((𝑓 “ ran 𝐸) ∈ V → ((𝑓 “ ran 𝐸) ∈ FinIII ↔ ¬ ω ≼* (𝑓 “ ran 𝐸)))
4038, 39ax-mp 5 . . . . . . . . . 10 ((𝑓 “ ran 𝐸) ∈ FinIII ↔ ¬ ω ≼* (𝑓 “ ran 𝐸))
4140con2bii 348 . . . . . . . . 9 (ω ≼* (𝑓 “ ran 𝐸) ↔ ¬ (𝑓 “ ran 𝐸) ∈ FinIII)
4236, 41sylib 209 . . . . . . . 8 (𝑓:𝐴onto→ω → ¬ (𝑓 “ ran 𝐸) ∈ FinIII)
43 fin1a2lem.aa . . . . . . . . . . . . . . 15 𝑆 = (𝑥 ∈ On ↦ suc 𝑥)
4412, 43fin1a2lem6 9480 . . . . . . . . . . . . . 14 (𝑆 ↾ ran 𝐸):ran 𝐸1-1-onto→(ω ∖ ran 𝐸)
45 f1ocnv 6332 . . . . . . . . . . . . . 14 ((𝑆 ↾ ran 𝐸):ran 𝐸1-1-onto→(ω ∖ ran 𝐸) → (𝑆 ↾ ran 𝐸):(ω ∖ ran 𝐸)–1-1-onto→ran 𝐸)
46 f1ofo 6327 . . . . . . . . . . . . . 14 ((𝑆 ↾ ran 𝐸):(ω ∖ ran 𝐸)–1-1-onto→ran 𝐸(𝑆 ↾ ran 𝐸):(ω ∖ ran 𝐸)–onto→ran 𝐸)
4744, 45, 46mp2b 10 . . . . . . . . . . . . 13 (𝑆 ↾ ran 𝐸):(ω ∖ ran 𝐸)–onto→ran 𝐸
48 foco 6308 . . . . . . . . . . . . 13 ((𝐸:ran 𝐸onto→ω ∧ (𝑆 ↾ ran 𝐸):(ω ∖ ran 𝐸)–onto→ran 𝐸) → (𝐸(𝑆 ↾ ran 𝐸)):(ω ∖ ran 𝐸)–onto→ω)
4916, 47, 48mp2an 683 . . . . . . . . . . . 12 (𝐸(𝑆 ↾ ran 𝐸)):(ω ∖ ran 𝐸)–onto→ω
50 fofun 6299 . . . . . . . . . . . 12 ((𝐸(𝑆 ↾ ran 𝐸)):(ω ∖ ran 𝐸)–onto→ω → Fun (𝐸(𝑆 ↾ ran 𝐸)))
5149, 50ax-mp 5 . . . . . . . . . . 11 Fun (𝐸(𝑆 ↾ ran 𝐸))
525resex 5620 . . . . . . . . . . 11 (𝑓 ↾ (𝐴 ∖ (𝑓 “ ran 𝐸))) ∈ V
53 cofunexg 7328 . . . . . . . . . . 11 ((Fun (𝐸(𝑆 ↾ ran 𝐸)) ∧ (𝑓 ↾ (𝐴 ∖ (𝑓 “ ran 𝐸))) ∈ V) → ((𝐸(𝑆 ↾ ran 𝐸)) ∘ (𝑓 ↾ (𝐴 ∖ (𝑓 “ ran 𝐸)))) ∈ V)
5451, 52, 53mp2an 683 . . . . . . . . . 10 ((𝐸(𝑆 ↾ ran 𝐸)) ∘ (𝑓 ↾ (𝐴 ∖ (𝑓 “ ran 𝐸)))) ∈ V
55 difss 3899 . . . . . . . . . . . . . 14 (𝐴 ∖ (𝑓 “ ran 𝐸)) ⊆ 𝐴
566fdmd 6232 . . . . . . . . . . . . . 14 (𝑓:𝐴onto→ω → dom 𝑓 = 𝐴)
5755, 56syl5sseqr 3814 . . . . . . . . . . . . 13 (𝑓:𝐴onto→ω → (𝐴 ∖ (𝑓 “ ran 𝐸)) ⊆ dom 𝑓)
58 fores 6307 . . . . . . . . . . . . 13 ((Fun 𝑓 ∧ (𝐴 ∖ (𝑓 “ ran 𝐸)) ⊆ dom 𝑓) → (𝑓 ↾ (𝐴 ∖ (𝑓 “ ran 𝐸))):(𝐴 ∖ (𝑓 “ ran 𝐸))–onto→(𝑓 “ (𝐴 ∖ (𝑓 “ ran 𝐸))))
5922, 57, 58syl2anc 579 . . . . . . . . . . . 12 (𝑓:𝐴onto→ω → (𝑓 ↾ (𝐴 ∖ (𝑓 “ ran 𝐸))):(𝐴 ∖ (𝑓 “ ran 𝐸))–onto→(𝑓 “ (𝐴 ∖ (𝑓 “ ran 𝐸))))
60 funcnvcnv 6134 . . . . . . . . . . . . . . . 16 (Fun 𝑓 → Fun 𝑓)
61 imadif 6151 . . . . . . . . . . . . . . . 16 (Fun 𝑓 → (𝑓 “ (ω ∖ ran 𝐸)) = ((𝑓 “ ω) ∖ (𝑓 “ ran 𝐸)))
6222, 60, 613syl 18 . . . . . . . . . . . . . . 15 (𝑓:𝐴onto→ω → (𝑓 “ (ω ∖ ran 𝐸)) = ((𝑓 “ ω) ∖ (𝑓 “ ran 𝐸)))
6362imaeq2d 5648 . . . . . . . . . . . . . 14 (𝑓:𝐴onto→ω → (𝑓 “ (𝑓 “ (ω ∖ ran 𝐸))) = (𝑓 “ ((𝑓 “ ω) ∖ (𝑓 “ ran 𝐸))))
64 difss 3899 . . . . . . . . . . . . . . 15 (ω ∖ ran 𝐸) ⊆ ω
65 foimacnv 6337 . . . . . . . . . . . . . . 15 ((𝑓:𝐴onto→ω ∧ (ω ∖ ran 𝐸) ⊆ ω) → (𝑓 “ (𝑓 “ (ω ∖ ran 𝐸))) = (ω ∖ ran 𝐸))
6664, 65mpan2 682 . . . . . . . . . . . . . 14 (𝑓:𝐴onto→ω → (𝑓 “ (𝑓 “ (ω ∖ ran 𝐸))) = (ω ∖ ran 𝐸))
67 fimacnv 6537 . . . . . . . . . . . . . . . . 17 (𝑓:𝐴⟶ω → (𝑓 “ ω) = 𝐴)
686, 67syl 17 . . . . . . . . . . . . . . . 16 (𝑓:𝐴onto→ω → (𝑓 “ ω) = 𝐴)
6968difeq1d 3889 . . . . . . . . . . . . . . 15 (𝑓:𝐴onto→ω → ((𝑓 “ ω) ∖ (𝑓 “ ran 𝐸)) = (𝐴 ∖ (𝑓 “ ran 𝐸)))
7069imaeq2d 5648 . . . . . . . . . . . . . 14 (𝑓:𝐴onto→ω → (𝑓 “ ((𝑓 “ ω) ∖ (𝑓 “ ran 𝐸))) = (𝑓 “ (𝐴 ∖ (𝑓 “ ran 𝐸))))
7163, 66, 703eqtr3rd 2808 . . . . . . . . . . . . 13 (𝑓:𝐴onto→ω → (𝑓 “ (𝐴 ∖ (𝑓 “ ran 𝐸))) = (ω ∖ ran 𝐸))
72 foeq3 6296 . . . . . . . . . . . . 13 ((𝑓 “ (𝐴 ∖ (𝑓 “ ran 𝐸))) = (ω ∖ ran 𝐸) → ((𝑓 ↾ (𝐴 ∖ (𝑓 “ ran 𝐸))):(𝐴 ∖ (𝑓 “ ran 𝐸))–onto→(𝑓 “ (𝐴 ∖ (𝑓 “ ran 𝐸))) ↔ (𝑓 ↾ (𝐴 ∖ (𝑓 “ ran 𝐸))):(𝐴 ∖ (𝑓 “ ran 𝐸))–onto→(ω ∖ ran 𝐸)))
7371, 72syl 17 . . . . . . . . . . . 12 (𝑓:𝐴onto→ω → ((𝑓 ↾ (𝐴 ∖ (𝑓 “ ran 𝐸))):(𝐴 ∖ (𝑓 “ ran 𝐸))–onto→(𝑓 “ (𝐴 ∖ (𝑓 “ ran 𝐸))) ↔ (𝑓 ↾ (𝐴 ∖ (𝑓 “ ran 𝐸))):(𝐴 ∖ (𝑓 “ ran 𝐸))–onto→(ω ∖ ran 𝐸)))
7459, 73mpbid 223 . . . . . . . . . . 11 (𝑓:𝐴onto→ω → (𝑓 ↾ (𝐴 ∖ (𝑓 “ ran 𝐸))):(𝐴 ∖ (𝑓 “ ran 𝐸))–onto→(ω ∖ ran 𝐸))
75 foco 6308 . . . . . . . . . . 11 (((𝐸(𝑆 ↾ ran 𝐸)):(ω ∖ ran 𝐸)–onto→ω ∧ (𝑓 ↾ (𝐴 ∖ (𝑓 “ ran 𝐸))):(𝐴 ∖ (𝑓 “ ran 𝐸))–onto→(ω ∖ ran 𝐸)) → ((𝐸(𝑆 ↾ ran 𝐸)) ∘ (𝑓 ↾ (𝐴 ∖ (𝑓 “ ran 𝐸)))):(𝐴 ∖ (𝑓 “ ran 𝐸))–onto→ω)
7649, 74, 75sylancr 581 . . . . . . . . . 10 (𝑓:𝐴onto→ω → ((𝐸(𝑆 ↾ ran 𝐸)) ∘ (𝑓 ↾ (𝐴 ∖ (𝑓 “ ran 𝐸)))):(𝐴 ∖ (𝑓 “ ran 𝐸))–onto→ω)
77 fowdom 8683 . . . . . . . . . 10 ((((𝐸(𝑆 ↾ ran 𝐸)) ∘ (𝑓 ↾ (𝐴 ∖ (𝑓 “ ran 𝐸)))) ∈ V ∧ ((𝐸(𝑆 ↾ ran 𝐸)) ∘ (𝑓 ↾ (𝐴 ∖ (𝑓 “ ran 𝐸)))):(𝐴 ∖ (𝑓 “ ran 𝐸))–onto→ω) → ω ≼* (𝐴 ∖ (𝑓 “ ran 𝐸)))
7854, 76, 77sylancr 581 . . . . . . . . 9 (𝑓:𝐴onto→ω → ω ≼* (𝐴 ∖ (𝑓 “ ran 𝐸)))
79 difexg 4969 . . . . . . . . . . 11 (𝐴 ∈ V → (𝐴 ∖ (𝑓 “ ran 𝐸)) ∈ V)
80 isfin3-2 9442 . . . . . . . . . . 11 ((𝐴 ∖ (𝑓 “ ran 𝐸)) ∈ V → ((𝐴 ∖ (𝑓 “ ran 𝐸)) ∈ FinIII ↔ ¬ ω ≼* (𝐴 ∖ (𝑓 “ ran 𝐸))))
818, 79, 803syl 18 . . . . . . . . . 10 (𝑓:𝐴onto→ω → ((𝐴 ∖ (𝑓 “ ran 𝐸)) ∈ FinIII ↔ ¬ ω ≼* (𝐴 ∖ (𝑓 “ ran 𝐸))))
8281con2bid 345 . . . . . . . . 9 (𝑓:𝐴onto→ω → (ω ≼* (𝐴 ∖ (𝑓 “ ran 𝐸)) ↔ ¬ (𝐴 ∖ (𝑓 “ ran 𝐸)) ∈ FinIII))
8378, 82mpbid 223 . . . . . . . 8 (𝑓:𝐴onto→ω → ¬ (𝐴 ∖ (𝑓 “ ran 𝐸)) ∈ FinIII)
84 eleq1 2832 . . . . . . . . . . . 12 (𝑦 = (𝑓 “ ran 𝐸) → (𝑦 ∈ FinIII ↔ (𝑓 “ ran 𝐸) ∈ FinIII))
85 difeq2 3884 . . . . . . . . . . . . 13 (𝑦 = (𝑓 “ ran 𝐸) → (𝐴𝑦) = (𝐴 ∖ (𝑓 “ ran 𝐸)))
8685eleq1d 2829 . . . . . . . . . . . 12 (𝑦 = (𝑓 “ ran 𝐸) → ((𝐴𝑦) ∈ FinIII ↔ (𝐴 ∖ (𝑓 “ ran 𝐸)) ∈ FinIII))
8784, 86orbi12d 942 . . . . . . . . . . 11 (𝑦 = (𝑓 “ ran 𝐸) → ((𝑦 ∈ FinIII ∨ (𝐴𝑦) ∈ FinIII) ↔ ((𝑓 “ ran 𝐸) ∈ FinIII ∨ (𝐴 ∖ (𝑓 “ ran 𝐸)) ∈ FinIII)))
8887notbid 309 . . . . . . . . . 10 (𝑦 = (𝑓 “ ran 𝐸) → (¬ (𝑦 ∈ FinIII ∨ (𝐴𝑦) ∈ FinIII) ↔ ¬ ((𝑓 “ ran 𝐸) ∈ FinIII ∨ (𝐴 ∖ (𝑓 “ ran 𝐸)) ∈ FinIII)))
89 ioran 1006 . . . . . . . . . 10 (¬ ((𝑓 “ ran 𝐸) ∈ FinIII ∨ (𝐴 ∖ (𝑓 “ ran 𝐸)) ∈ FinIII) ↔ (¬ (𝑓 “ ran 𝐸) ∈ FinIII ∧ ¬ (𝐴 ∖ (𝑓 “ ran 𝐸)) ∈ FinIII))
9088, 89syl6bb 278 . . . . . . . . 9 (𝑦 = (𝑓 “ ran 𝐸) → (¬ (𝑦 ∈ FinIII ∨ (𝐴𝑦) ∈ FinIII) ↔ (¬ (𝑓 “ ran 𝐸) ∈ FinIII ∧ ¬ (𝐴 ∖ (𝑓 “ ran 𝐸)) ∈ FinIII)))
9190rspcev 3461 . . . . . . . 8 (((𝑓 “ ran 𝐸) ∈ 𝒫 𝐴 ∧ (¬ (𝑓 “ ran 𝐸) ∈ FinIII ∧ ¬ (𝐴 ∖ (𝑓 “ ran 𝐸)) ∈ FinIII)) → ∃𝑦 ∈ 𝒫 𝐴 ¬ (𝑦 ∈ FinIII ∨ (𝐴𝑦) ∈ FinIII))
9211, 42, 83, 91syl12anc 865 . . . . . . 7 (𝑓:𝐴onto→ω → ∃𝑦 ∈ 𝒫 𝐴 ¬ (𝑦 ∈ FinIII ∨ (𝐴𝑦) ∈ FinIII))
93 rexnal 3141 . . . . . . 7 (∃𝑦 ∈ 𝒫 𝐴 ¬ (𝑦 ∈ FinIII ∨ (𝐴𝑦) ∈ FinIII) ↔ ¬ ∀𝑦 ∈ 𝒫 𝐴(𝑦 ∈ FinIII ∨ (𝐴𝑦) ∈ FinIII))
9492, 93sylib 209 . . . . . 6 (𝑓:𝐴onto→ω → ¬ ∀𝑦 ∈ 𝒫 𝐴(𝑦 ∈ FinIII ∨ (𝐴𝑦) ∈ FinIII))
9594exlimiv 2025 . . . . 5 (∃𝑓 𝑓:𝐴onto→ω → ¬ ∀𝑦 ∈ 𝒫 𝐴(𝑦 ∈ FinIII ∨ (𝐴𝑦) ∈ FinIII))
964, 95sylbi 208 . . . 4 (ω ≼* 𝐴 → ¬ ∀𝑦 ∈ 𝒫 𝐴(𝑦 ∈ FinIII ∨ (𝐴𝑦) ∈ FinIII))
9796con2i 136 . . 3 (∀𝑦 ∈ 𝒫 𝐴(𝑦 ∈ FinIII ∨ (𝐴𝑦) ∈ FinIII) → ¬ ω ≼* 𝐴)
98 isfin3-2 9442 . . 3 (𝐴𝑉 → (𝐴 ∈ FinIII ↔ ¬ ω ≼* 𝐴))
9997, 98syl5ibr 237 . 2 (𝐴𝑉 → (∀𝑦 ∈ 𝒫 𝐴(𝑦 ∈ FinIII ∨ (𝐴𝑦) ∈ FinIII) → 𝐴 ∈ FinIII))
10099imp 395 1 ((𝐴𝑉 ∧ ∀𝑦 ∈ 𝒫 𝐴(𝑦 ∈ FinIII ∨ (𝐴𝑦) ∈ FinIII)) → 𝐴 ∈ FinIII)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 197  wa 384  wo 873   = wceq 1652  wex 1874  wcel 2155  wne 2937  wral 3055  wrex 3056  Vcvv 3350  cdif 3729  wss 3732  c0 4079  𝒫 cpw 4315   class class class wbr 4809  cmpt 4888  ccnv 5276  dom cdm 5277  ran crn 5278  cres 5279  cima 5280  ccom 5281  Oncon0 5908  suc csuc 5910  Fun wfun 6062  wf 6064  1-1wf1 6065  ontowfo 6066  1-1-ontowf1o 6067  (class class class)co 6842  ωcom 7263  2𝑜c2o 7758   ·𝑜 comu 7762  * cwdom 8669  FinIIIcfin3 9356
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1890  ax-4 1904  ax-5 2005  ax-6 2070  ax-7 2105  ax-8 2157  ax-9 2164  ax-10 2183  ax-11 2198  ax-12 2211  ax-13 2352  ax-ext 2743  ax-rep 4930  ax-sep 4941  ax-nul 4949  ax-pow 5001  ax-pr 5062  ax-un 7147
This theorem depends on definitions:  df-bi 198  df-an 385  df-or 874  df-3or 1108  df-3an 1109  df-tru 1656  df-ex 1875  df-nf 1879  df-sb 2063  df-mo 2565  df-eu 2582  df-clab 2752  df-cleq 2758  df-clel 2761  df-nfc 2896  df-ne 2938  df-ral 3060  df-rex 3061  df-reu 3062  df-rmo 3063  df-rab 3064  df-v 3352  df-sbc 3597  df-csb 3692  df-dif 3735  df-un 3737  df-in 3739  df-ss 3746  df-pss 3748  df-nul 4080  df-if 4244  df-pw 4317  df-sn 4335  df-pr 4337  df-tp 4339  df-op 4341  df-uni 4595  df-int 4634  df-iun 4678  df-br 4810  df-opab 4872  df-mpt 4889  df-tr 4912  df-id 5185  df-eprel 5190  df-po 5198  df-so 5199  df-fr 5236  df-se 5237  df-we 5238  df-xp 5283  df-rel 5284  df-cnv 5285  df-co 5286  df-dm 5287  df-rn 5288  df-res 5289  df-ima 5290  df-pred 5865  df-ord 5911  df-on 5912  df-lim 5913  df-suc 5914  df-iota 6031  df-fun 6070  df-fn 6071  df-f 6072  df-f1 6073  df-fo 6074  df-f1o 6075  df-fv 6076  df-isom 6077  df-riota 6803  df-ov 6845  df-oprab 6846  df-mpt2 6847  df-om 7264  df-1st 7366  df-2nd 7367  df-wrecs 7610  df-recs 7672  df-rdg 7710  df-seqom 7747  df-1o 7764  df-2o 7765  df-oadd 7768  df-omul 7769  df-er 7947  df-map 8062  df-en 8161  df-dom 8162  df-sdom 8163  df-fin 8164  df-wdom 8671  df-card 9016  df-fin4 9362  df-fin3 9363
This theorem is referenced by:  fin1a2lem8  9482
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