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Theorem fin23lem40 9056
 Description: Lemma for fin23 9094. FinII sets satisfy the descending chain condition. (Contributed by Stefan O'Rear, 3-Nov-2014.)
Hypothesis
Ref Expression
fin23lem40.f 𝐹 = {𝑔 ∣ ∀𝑎 ∈ (𝒫 𝑔𝑚 ω)(∀𝑥 ∈ ω (𝑎‘suc 𝑥) ⊆ (𝑎𝑥) → ran 𝑎 ∈ ran 𝑎)}
Assertion
Ref Expression
fin23lem40 (𝐴 ∈ FinII𝐴𝐹)
Distinct variable groups:   𝑔,𝑎,𝑥,𝐴   𝐹,𝑎
Allowed substitution hints:   𝐹(𝑥,𝑔)

Proof of Theorem fin23lem40
Dummy variables 𝑏 𝑓 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 elmapi 7765 . . . 4 (𝑓 ∈ (𝒫 𝐴𝑚 ω) → 𝑓:ω⟶𝒫 𝐴)
2 simpl 472 . . . . . 6 ((𝐴 ∈ FinII ∧ (𝑓:ω⟶𝒫 𝐴 ∧ ∀𝑏 ∈ ω (𝑓‘suc 𝑏) ⊆ (𝑓𝑏))) → 𝐴 ∈ FinII)
3 frn 5966 . . . . . . 7 (𝑓:ω⟶𝒫 𝐴 → ran 𝑓 ⊆ 𝒫 𝐴)
43ad2antrl 760 . . . . . 6 ((𝐴 ∈ FinII ∧ (𝑓:ω⟶𝒫 𝐴 ∧ ∀𝑏 ∈ ω (𝑓‘suc 𝑏) ⊆ (𝑓𝑏))) → ran 𝑓 ⊆ 𝒫 𝐴)
5 fdm 5964 . . . . . . . . 9 (𝑓:ω⟶𝒫 𝐴 → dom 𝑓 = ω)
6 peano1 6977 . . . . . . . . . 10 ∅ ∈ ω
7 ne0i 3880 . . . . . . . . . 10 (∅ ∈ ω → ω ≠ ∅)
86, 7mp1i 13 . . . . . . . . 9 (𝑓:ω⟶𝒫 𝐴 → ω ≠ ∅)
95, 8eqnetrd 2849 . . . . . . . 8 (𝑓:ω⟶𝒫 𝐴 → dom 𝑓 ≠ ∅)
10 dm0rn0 5263 . . . . . . . . 9 (dom 𝑓 = ∅ ↔ ran 𝑓 = ∅)
1110necon3bii 2834 . . . . . . . 8 (dom 𝑓 ≠ ∅ ↔ ran 𝑓 ≠ ∅)
129, 11sylib 207 . . . . . . 7 (𝑓:ω⟶𝒫 𝐴 → ran 𝑓 ≠ ∅)
1312ad2antrl 760 . . . . . 6 ((𝐴 ∈ FinII ∧ (𝑓:ω⟶𝒫 𝐴 ∧ ∀𝑏 ∈ ω (𝑓‘suc 𝑏) ⊆ (𝑓𝑏))) → ran 𝑓 ≠ ∅)
14 ffn 5958 . . . . . . . . 9 (𝑓:ω⟶𝒫 𝐴𝑓 Fn ω)
1514ad2antrl 760 . . . . . . . 8 ((𝐴 ∈ FinII ∧ (𝑓:ω⟶𝒫 𝐴 ∧ ∀𝑏 ∈ ω (𝑓‘suc 𝑏) ⊆ (𝑓𝑏))) → 𝑓 Fn ω)
16 sspss 3668 . . . . . . . . . . 11 ((𝑓‘suc 𝑏) ⊆ (𝑓𝑏) ↔ ((𝑓‘suc 𝑏) ⊊ (𝑓𝑏) ∨ (𝑓‘suc 𝑏) = (𝑓𝑏)))
17 fvex 6113 . . . . . . . . . . . . . 14 (𝑓𝑏) ∈ V
18 fvex 6113 . . . . . . . . . . . . . 14 (𝑓‘suc 𝑏) ∈ V
1917, 18brcnv 5227 . . . . . . . . . . . . 13 ((𝑓𝑏) [] (𝑓‘suc 𝑏) ↔ (𝑓‘suc 𝑏) [] (𝑓𝑏))
2017brrpss 6838 . . . . . . . . . . . . 13 ((𝑓‘suc 𝑏) [] (𝑓𝑏) ↔ (𝑓‘suc 𝑏) ⊊ (𝑓𝑏))
2119, 20bitri 263 . . . . . . . . . . . 12 ((𝑓𝑏) [] (𝑓‘suc 𝑏) ↔ (𝑓‘suc 𝑏) ⊊ (𝑓𝑏))
22 eqcom 2617 . . . . . . . . . . . 12 ((𝑓𝑏) = (𝑓‘suc 𝑏) ↔ (𝑓‘suc 𝑏) = (𝑓𝑏))
2321, 22orbi12i 542 . . . . . . . . . . 11 (((𝑓𝑏) [] (𝑓‘suc 𝑏) ∨ (𝑓𝑏) = (𝑓‘suc 𝑏)) ↔ ((𝑓‘suc 𝑏) ⊊ (𝑓𝑏) ∨ (𝑓‘suc 𝑏) = (𝑓𝑏)))
2416, 23sylbb2 227 . . . . . . . . . 10 ((𝑓‘suc 𝑏) ⊆ (𝑓𝑏) → ((𝑓𝑏) [] (𝑓‘suc 𝑏) ∨ (𝑓𝑏) = (𝑓‘suc 𝑏)))
2524ralimi 2936 . . . . . . . . 9 (∀𝑏 ∈ ω (𝑓‘suc 𝑏) ⊆ (𝑓𝑏) → ∀𝑏 ∈ ω ((𝑓𝑏) [] (𝑓‘suc 𝑏) ∨ (𝑓𝑏) = (𝑓‘suc 𝑏)))
2625ad2antll 761 . . . . . . . 8 ((𝐴 ∈ FinII ∧ (𝑓:ω⟶𝒫 𝐴 ∧ ∀𝑏 ∈ ω (𝑓‘suc 𝑏) ⊆ (𝑓𝑏))) → ∀𝑏 ∈ ω ((𝑓𝑏) [] (𝑓‘suc 𝑏) ∨ (𝑓𝑏) = (𝑓‘suc 𝑏)))
27 porpss 6839 . . . . . . . . . 10 [] Po ran 𝑓
28 cnvpo 5590 . . . . . . . . . 10 ( [] Po ran 𝑓 [] Po ran 𝑓)
2927, 28mpbi 219 . . . . . . . . 9 [] Po ran 𝑓
3029a1i 11 . . . . . . . 8 ((𝐴 ∈ FinII ∧ (𝑓:ω⟶𝒫 𝐴 ∧ ∀𝑏 ∈ ω (𝑓‘suc 𝑏) ⊆ (𝑓𝑏))) → [] Po ran 𝑓)
31 sornom 8982 . . . . . . . 8 ((𝑓 Fn ω ∧ ∀𝑏 ∈ ω ((𝑓𝑏) [] (𝑓‘suc 𝑏) ∨ (𝑓𝑏) = (𝑓‘suc 𝑏)) ∧ [] Po ran 𝑓) → [] Or ran 𝑓)
3215, 26, 30, 31syl3anc 1318 . . . . . . 7 ((𝐴 ∈ FinII ∧ (𝑓:ω⟶𝒫 𝐴 ∧ ∀𝑏 ∈ ω (𝑓‘suc 𝑏) ⊆ (𝑓𝑏))) → [] Or ran 𝑓)
33 cnvso 5591 . . . . . . 7 ( [] Or ran 𝑓 [] Or ran 𝑓)
3432, 33sylibr 223 . . . . . 6 ((𝐴 ∈ FinII ∧ (𝑓:ω⟶𝒫 𝐴 ∧ ∀𝑏 ∈ ω (𝑓‘suc 𝑏) ⊆ (𝑓𝑏))) → [] Or ran 𝑓)
35 fin2i2 9023 . . . . . 6 (((𝐴 ∈ FinII ∧ ran 𝑓 ⊆ 𝒫 𝐴) ∧ (ran 𝑓 ≠ ∅ ∧ [] Or ran 𝑓)) → ran 𝑓 ∈ ran 𝑓)
362, 4, 13, 34, 35syl22anc 1319 . . . . 5 ((𝐴 ∈ FinII ∧ (𝑓:ω⟶𝒫 𝐴 ∧ ∀𝑏 ∈ ω (𝑓‘suc 𝑏) ⊆ (𝑓𝑏))) → ran 𝑓 ∈ ran 𝑓)
3736expr 641 . . . 4 ((𝐴 ∈ FinII𝑓:ω⟶𝒫 𝐴) → (∀𝑏 ∈ ω (𝑓‘suc 𝑏) ⊆ (𝑓𝑏) → ran 𝑓 ∈ ran 𝑓))
381, 37sylan2 490 . . 3 ((𝐴 ∈ FinII𝑓 ∈ (𝒫 𝐴𝑚 ω)) → (∀𝑏 ∈ ω (𝑓‘suc 𝑏) ⊆ (𝑓𝑏) → ran 𝑓 ∈ ran 𝑓))
3938ralrimiva 2949 . 2 (𝐴 ∈ FinII → ∀𝑓 ∈ (𝒫 𝐴𝑚 ω)(∀𝑏 ∈ ω (𝑓‘suc 𝑏) ⊆ (𝑓𝑏) → ran 𝑓 ∈ ran 𝑓))
40 fin23lem40.f . . 3 𝐹 = {𝑔 ∣ ∀𝑎 ∈ (𝒫 𝑔𝑚 ω)(∀𝑥 ∈ ω (𝑎‘suc 𝑥) ⊆ (𝑎𝑥) → ran 𝑎 ∈ ran 𝑎)}
4140isfin3ds 9034 . 2 (𝐴 ∈ FinII → (𝐴𝐹 ↔ ∀𝑓 ∈ (𝒫 𝐴𝑚 ω)(∀𝑏 ∈ ω (𝑓‘suc 𝑏) ⊆ (𝑓𝑏) → ran 𝑓 ∈ ran 𝑓)))
4239, 41mpbird 246 1 (𝐴 ∈ FinII𝐴𝐹)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∨ wo 382   ∧ wa 383   = wceq 1475   ∈ wcel 1977  {cab 2596   ≠ wne 2780  ∀wral 2896   ⊆ wss 3540   ⊊ wpss 3541  ∅c0 3874  𝒫 cpw 4108  ∩ cint 4410   class class class wbr 4583   Po wpo 4957   Or wor 4958  ◡ccnv 5037  dom cdm 5038  ran crn 5039  suc csuc 5642   Fn wfn 5799  ⟶wf 5800  ‘cfv 5804  (class class class)co 6549   [⊊] crpss 6834  ωcom 6957   ↑𝑚 cmap 7744  FinIIcfin2 8984 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847 This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-int 4411  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-fv 5812  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-rpss 6835  df-om 6958  df-1st 7059  df-2nd 7060  df-map 7746  df-fin2 8991 This theorem is referenced by:  fin23  9094
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