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Theorem fin67 9809
Description: Every VI-finite set is VII-finite. (Contributed by Stefan O'Rear, 29-Oct-2014.) (Revised by Mario Carneiro, 17-May-2015.)
Assertion
Ref Expression
fin67 (𝐴 ∈ FinVI𝐴 ∈ FinVII)

Proof of Theorem fin67
Dummy variable 𝑏 is distinct from all other variables.
StepHypRef Expression
1 isfin6 9714 . 2 (𝐴 ∈ FinVI ↔ (𝐴 ≺ 2o𝐴 ≺ (𝐴 × 𝐴)))
2 2onn 8259 . . . . . 6 2o ∈ ω
3 ssid 3992 . . . . . 6 2o ⊆ 2o
4 ssnnfi 8729 . . . . . 6 ((2o ∈ ω ∧ 2o ⊆ 2o) → 2o ∈ Fin)
52, 3, 4mp2an 688 . . . . 5 2o ∈ Fin
6 sdomdom 8529 . . . . 5 (𝐴 ≺ 2o𝐴 ≼ 2o)
7 domfi 8731 . . . . 5 ((2o ∈ Fin ∧ 𝐴 ≼ 2o) → 𝐴 ∈ Fin)
85, 6, 7sylancr 587 . . . 4 (𝐴 ≺ 2o𝐴 ∈ Fin)
9 fin17 9808 . . . 4 (𝐴 ∈ Fin → 𝐴 ∈ FinVII)
108, 9syl 17 . . 3 (𝐴 ≺ 2o𝐴 ∈ FinVII)
11 sdomnen 8530 . . . . 5 (𝐴 ≺ (𝐴 × 𝐴) → ¬ 𝐴 ≈ (𝐴 × 𝐴))
12 eldifi 4106 . . . . . . . . 9 (𝑏 ∈ (On ∖ ω) → 𝑏 ∈ On)
13 ensym 8550 . . . . . . . . 9 (𝐴𝑏𝑏𝐴)
14 isnumi 9367 . . . . . . . . 9 ((𝑏 ∈ On ∧ 𝑏𝐴) → 𝐴 ∈ dom card)
1512, 13, 14syl2an 595 . . . . . . . 8 ((𝑏 ∈ (On ∖ ω) ∧ 𝐴𝑏) → 𝐴 ∈ dom card)
16 vex 3502 . . . . . . . . . . 11 𝑏 ∈ V
17 eldif 3949 . . . . . . . . . . . 12 (𝑏 ∈ (On ∖ ω) ↔ (𝑏 ∈ On ∧ ¬ 𝑏 ∈ ω))
18 ordom 7580 . . . . . . . . . . . . . 14 Ord ω
19 eloni 6198 . . . . . . . . . . . . . 14 (𝑏 ∈ On → Ord 𝑏)
20 ordtri1 6221 . . . . . . . . . . . . . 14 ((Ord ω ∧ Ord 𝑏) → (ω ⊆ 𝑏 ↔ ¬ 𝑏 ∈ ω))
2118, 19, 20sylancr 587 . . . . . . . . . . . . 13 (𝑏 ∈ On → (ω ⊆ 𝑏 ↔ ¬ 𝑏 ∈ ω))
2221biimpar 478 . . . . . . . . . . . 12 ((𝑏 ∈ On ∧ ¬ 𝑏 ∈ ω) → ω ⊆ 𝑏)
2317, 22sylbi 218 . . . . . . . . . . 11 (𝑏 ∈ (On ∖ ω) → ω ⊆ 𝑏)
24 ssdomg 8547 . . . . . . . . . . 11 (𝑏 ∈ V → (ω ⊆ 𝑏 → ω ≼ 𝑏))
2516, 23, 24mpsyl 68 . . . . . . . . . 10 (𝑏 ∈ (On ∖ ω) → ω ≼ 𝑏)
26 domen2 8652 . . . . . . . . . 10 (𝐴𝑏 → (ω ≼ 𝐴 ↔ ω ≼ 𝑏))
2725, 26syl5ibr 247 . . . . . . . . 9 (𝐴𝑏 → (𝑏 ∈ (On ∖ ω) → ω ≼ 𝐴))
2827impcom 408 . . . . . . . 8 ((𝑏 ∈ (On ∖ ω) ∧ 𝐴𝑏) → ω ≼ 𝐴)
29 infxpidm2 9435 . . . . . . . 8 ((𝐴 ∈ dom card ∧ ω ≼ 𝐴) → (𝐴 × 𝐴) ≈ 𝐴)
3015, 28, 29syl2anc 584 . . . . . . 7 ((𝑏 ∈ (On ∖ ω) ∧ 𝐴𝑏) → (𝐴 × 𝐴) ≈ 𝐴)
31 ensym 8550 . . . . . . 7 ((𝐴 × 𝐴) ≈ 𝐴𝐴 ≈ (𝐴 × 𝐴))
3230, 31syl 17 . . . . . 6 ((𝑏 ∈ (On ∖ ω) ∧ 𝐴𝑏) → 𝐴 ≈ (𝐴 × 𝐴))
3332rexlimiva 3285 . . . . 5 (∃𝑏 ∈ (On ∖ ω)𝐴𝑏𝐴 ≈ (𝐴 × 𝐴))
3411, 33nsyl 142 . . . 4 (𝐴 ≺ (𝐴 × 𝐴) → ¬ ∃𝑏 ∈ (On ∖ ω)𝐴𝑏)
35 relsdom 8508 . . . . . 6 Rel ≺
3635brrelex1i 5606 . . . . 5 (𝐴 ≺ (𝐴 × 𝐴) → 𝐴 ∈ V)
37 isfin7 9715 . . . . 5 (𝐴 ∈ V → (𝐴 ∈ FinVII ↔ ¬ ∃𝑏 ∈ (On ∖ ω)𝐴𝑏))
3836, 37syl 17 . . . 4 (𝐴 ≺ (𝐴 × 𝐴) → (𝐴 ∈ FinVII ↔ ¬ ∃𝑏 ∈ (On ∖ ω)𝐴𝑏))
3934, 38mpbird 258 . . 3 (𝐴 ≺ (𝐴 × 𝐴) → 𝐴 ∈ FinVII)
4010, 39jaoi 853 . 2 ((𝐴 ≺ 2o𝐴 ≺ (𝐴 × 𝐴)) → 𝐴 ∈ FinVII)
411, 40sylbi 218 1 (𝐴 ∈ FinVI𝐴 ∈ FinVII)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 207  wa 396  wo 843  wcel 2106  wrex 3143  Vcvv 3499  cdif 3936  wss 3939   class class class wbr 5062   × cxp 5551  dom cdm 5553  Ord word 6187  Oncon0 6188  ωcom 7571  2oc2o 8090  cen 8498  cdom 8499  csdm 8500  Fincfn 8501  cardccrd 9356  FinVIcfin6 9697  FinVIIcfin7 9698
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1904  ax-6 1963  ax-7 2008  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2152  ax-12 2167  ax-ext 2796  ax-rep 5186  ax-sep 5199  ax-nul 5206  ax-pow 5262  ax-pr 5325  ax-un 7454  ax-inf2 9096
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 844  df-3or 1082  df-3an 1083  df-tru 1533  df-ex 1774  df-nf 1778  df-sb 2063  df-mo 2615  df-eu 2649  df-clab 2803  df-cleq 2817  df-clel 2897  df-nfc 2967  df-ne 3021  df-ral 3147  df-rex 3148  df-reu 3149  df-rmo 3150  df-rab 3151  df-v 3501  df-sbc 3776  df-csb 3887  df-dif 3942  df-un 3944  df-in 3946  df-ss 3955  df-pss 3957  df-nul 4295  df-if 4470  df-pw 4543  df-sn 4564  df-pr 4566  df-tp 4568  df-op 4570  df-uni 4837  df-int 4874  df-iun 4918  df-br 5063  df-opab 5125  df-mpt 5143  df-tr 5169  df-id 5458  df-eprel 5463  df-po 5472  df-so 5473  df-fr 5512  df-se 5513  df-we 5514  df-xp 5559  df-rel 5560  df-cnv 5561  df-co 5562  df-dm 5563  df-rn 5564  df-res 5565  df-ima 5566  df-pred 6145  df-ord 6191  df-on 6192  df-lim 6193  df-suc 6194  df-iota 6311  df-fun 6353  df-fn 6354  df-f 6355  df-f1 6356  df-fo 6357  df-f1o 6358  df-fv 6359  df-isom 6360  df-riota 7109  df-ov 7154  df-oprab 7155  df-mpo 7156  df-om 7572  df-1st 7683  df-2nd 7684  df-wrecs 7941  df-recs 8002  df-rdg 8040  df-1o 8096  df-2o 8097  df-oadd 8100  df-er 8282  df-en 8502  df-dom 8503  df-sdom 8504  df-fin 8505  df-oi 8966  df-card 9360  df-fin6 9704  df-fin7 9705
This theorem is referenced by:  fin2so  34747
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