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Theorem cfslb 9673
Description: Any cofinal subset of 𝐴 is at least as large as (cf‘𝐴). (Contributed by Mario Carneiro, 24-Jun-2013.)
Hypothesis
Ref Expression
cfslb.1 𝐴 ∈ V
Assertion
Ref Expression
cfslb ((Lim 𝐴𝐵𝐴 𝐵 = 𝐴) → (cf‘𝐴) ≼ 𝐵)

Proof of Theorem cfslb
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 fvex 6664 . . 3 (card‘𝐵) ∈ V
2 ssid 3973 . . . . . . 7 (card‘𝐵) ⊆ (card‘𝐵)
3 cfslb.1 . . . . . . . . . . 11 𝐴 ∈ V
43ssex 5206 . . . . . . . . . 10 (𝐵𝐴𝐵 ∈ V)
54ad2antrr 725 . . . . . . . . 9 (((𝐵𝐴 𝐵 = 𝐴) ∧ (card‘𝐵) ⊆ (card‘𝐵)) → 𝐵 ∈ V)
6 velpw 4525 . . . . . . . . . . . . 13 (𝑥 ∈ 𝒫 𝐴𝑥𝐴)
7 sseq1 3976 . . . . . . . . . . . . 13 (𝑥 = 𝐵 → (𝑥𝐴𝐵𝐴))
86, 7syl5bb 286 . . . . . . . . . . . 12 (𝑥 = 𝐵 → (𝑥 ∈ 𝒫 𝐴𝐵𝐴))
9 unieq 4830 . . . . . . . . . . . . 13 (𝑥 = 𝐵 𝑥 = 𝐵)
109eqeq1d 2826 . . . . . . . . . . . 12 (𝑥 = 𝐵 → ( 𝑥 = 𝐴 𝐵 = 𝐴))
118, 10anbi12d 633 . . . . . . . . . . 11 (𝑥 = 𝐵 → ((𝑥 ∈ 𝒫 𝐴 𝑥 = 𝐴) ↔ (𝐵𝐴 𝐵 = 𝐴)))
12 fveq2 6651 . . . . . . . . . . . 12 (𝑥 = 𝐵 → (card‘𝑥) = (card‘𝐵))
1312sseq1d 3982 . . . . . . . . . . 11 (𝑥 = 𝐵 → ((card‘𝑥) ⊆ (card‘𝐵) ↔ (card‘𝐵) ⊆ (card‘𝐵)))
1411, 13anbi12d 633 . . . . . . . . . 10 (𝑥 = 𝐵 → (((𝑥 ∈ 𝒫 𝐴 𝑥 = 𝐴) ∧ (card‘𝑥) ⊆ (card‘𝐵)) ↔ ((𝐵𝐴 𝐵 = 𝐴) ∧ (card‘𝐵) ⊆ (card‘𝐵))))
1514spcegv 3582 . . . . . . . . 9 (𝐵 ∈ V → (((𝐵𝐴 𝐵 = 𝐴) ∧ (card‘𝐵) ⊆ (card‘𝐵)) → ∃𝑥((𝑥 ∈ 𝒫 𝐴 𝑥 = 𝐴) ∧ (card‘𝑥) ⊆ (card‘𝐵))))
165, 15mpcom 38 . . . . . . . 8 (((𝐵𝐴 𝐵 = 𝐴) ∧ (card‘𝐵) ⊆ (card‘𝐵)) → ∃𝑥((𝑥 ∈ 𝒫 𝐴 𝑥 = 𝐴) ∧ (card‘𝑥) ⊆ (card‘𝐵)))
17 df-rex 3138 . . . . . . . . 9 (∃𝑥 ∈ {𝑥 ∈ 𝒫 𝐴 𝑥 = 𝐴} (card‘𝑥) ⊆ (card‘𝐵) ↔ ∃𝑥(𝑥 ∈ {𝑥 ∈ 𝒫 𝐴 𝑥 = 𝐴} ∧ (card‘𝑥) ⊆ (card‘𝐵)))
18 rabid 3369 . . . . . . . . . . 11 (𝑥 ∈ {𝑥 ∈ 𝒫 𝐴 𝑥 = 𝐴} ↔ (𝑥 ∈ 𝒫 𝐴 𝑥 = 𝐴))
1918anbi1i 626 . . . . . . . . . 10 ((𝑥 ∈ {𝑥 ∈ 𝒫 𝐴 𝑥 = 𝐴} ∧ (card‘𝑥) ⊆ (card‘𝐵)) ↔ ((𝑥 ∈ 𝒫 𝐴 𝑥 = 𝐴) ∧ (card‘𝑥) ⊆ (card‘𝐵)))
2019exbii 1849 . . . . . . . . 9 (∃𝑥(𝑥 ∈ {𝑥 ∈ 𝒫 𝐴 𝑥 = 𝐴} ∧ (card‘𝑥) ⊆ (card‘𝐵)) ↔ ∃𝑥((𝑥 ∈ 𝒫 𝐴 𝑥 = 𝐴) ∧ (card‘𝑥) ⊆ (card‘𝐵)))
2117, 20bitri 278 . . . . . . . 8 (∃𝑥 ∈ {𝑥 ∈ 𝒫 𝐴 𝑥 = 𝐴} (card‘𝑥) ⊆ (card‘𝐵) ↔ ∃𝑥((𝑥 ∈ 𝒫 𝐴 𝑥 = 𝐴) ∧ (card‘𝑥) ⊆ (card‘𝐵)))
2216, 21sylibr 237 . . . . . . 7 (((𝐵𝐴 𝐵 = 𝐴) ∧ (card‘𝐵) ⊆ (card‘𝐵)) → ∃𝑥 ∈ {𝑥 ∈ 𝒫 𝐴 𝑥 = 𝐴} (card‘𝑥) ⊆ (card‘𝐵))
232, 22mpan2 690 . . . . . 6 ((𝐵𝐴 𝐵 = 𝐴) → ∃𝑥 ∈ {𝑥 ∈ 𝒫 𝐴 𝑥 = 𝐴} (card‘𝑥) ⊆ (card‘𝐵))
24 iinss 4961 . . . . . 6 (∃𝑥 ∈ {𝑥 ∈ 𝒫 𝐴 𝑥 = 𝐴} (card‘𝑥) ⊆ (card‘𝐵) → 𝑥 ∈ {𝑥 ∈ 𝒫 𝐴 𝑥 = 𝐴} (card‘𝑥) ⊆ (card‘𝐵))
2523, 24syl 17 . . . . 5 ((𝐵𝐴 𝐵 = 𝐴) → 𝑥 ∈ {𝑥 ∈ 𝒫 𝐴 𝑥 = 𝐴} (card‘𝑥) ⊆ (card‘𝐵))
263cflim3 9669 . . . . . 6 (Lim 𝐴 → (cf‘𝐴) = 𝑥 ∈ {𝑥 ∈ 𝒫 𝐴 𝑥 = 𝐴} (card‘𝑥))
2726sseq1d 3982 . . . . 5 (Lim 𝐴 → ((cf‘𝐴) ⊆ (card‘𝐵) ↔ 𝑥 ∈ {𝑥 ∈ 𝒫 𝐴 𝑥 = 𝐴} (card‘𝑥) ⊆ (card‘𝐵)))
2825, 27syl5ibr 249 . . . 4 (Lim 𝐴 → ((𝐵𝐴 𝐵 = 𝐴) → (cf‘𝐴) ⊆ (card‘𝐵)))
29283impib 1113 . . 3 ((Lim 𝐴𝐵𝐴 𝐵 = 𝐴) → (cf‘𝐴) ⊆ (card‘𝐵))
30 ssdomg 8538 . . 3 ((card‘𝐵) ∈ V → ((cf‘𝐴) ⊆ (card‘𝐵) → (cf‘𝐴) ≼ (card‘𝐵)))
311, 29, 30mpsyl 68 . 2 ((Lim 𝐴𝐵𝐴 𝐵 = 𝐴) → (cf‘𝐴) ≼ (card‘𝐵))
32 limord 6231 . . . . . . 7 (Lim 𝐴 → Ord 𝐴)
33 ordsson 7487 . . . . . . 7 (Ord 𝐴𝐴 ⊆ On)
3432, 33syl 17 . . . . . 6 (Lim 𝐴𝐴 ⊆ On)
35 sstr2 3958 . . . . . 6 (𝐵𝐴 → (𝐴 ⊆ On → 𝐵 ⊆ On))
3634, 35mpan9 510 . . . . 5 ((Lim 𝐴𝐵𝐴) → 𝐵 ⊆ On)
37 onssnum 9451 . . . . 5 ((𝐵 ∈ V ∧ 𝐵 ⊆ On) → 𝐵 ∈ dom card)
384, 36, 37syl2an2 685 . . . 4 ((Lim 𝐴𝐵𝐴) → 𝐵 ∈ dom card)
39 cardid2 9366 . . . 4 (𝐵 ∈ dom card → (card‘𝐵) ≈ 𝐵)
4038, 39syl 17 . . 3 ((Lim 𝐴𝐵𝐴) → (card‘𝐵) ≈ 𝐵)
41403adant3 1129 . 2 ((Lim 𝐴𝐵𝐴 𝐵 = 𝐴) → (card‘𝐵) ≈ 𝐵)
42 domentr 8551 . 2 (((cf‘𝐴) ≼ (card‘𝐵) ∧ (card‘𝐵) ≈ 𝐵) → (cf‘𝐴) ≼ 𝐵)
4331, 41, 42syl2anc 587 1 ((Lim 𝐴𝐵𝐴 𝐵 = 𝐴) → (cf‘𝐴) ≼ 𝐵)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 399  w3a 1084   = wceq 1538  wex 1781  wcel 2115  wrex 3133  {crab 3136  Vcvv 3479  wss 3918  𝒫 cpw 4520   cuni 4819   ciin 4901   class class class wbr 5047  dom cdm 5536  Ord word 6171  Oncon0 6172  Lim wlim 6173  cfv 6336  cen 8489  cdom 8490  cardccrd 9348  cfccf 9350
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1971  ax-7 2016  ax-8 2117  ax-9 2125  ax-10 2146  ax-11 2162  ax-12 2179  ax-ext 2796  ax-rep 5171  ax-sep 5184  ax-nul 5191  ax-pow 5247  ax-pr 5311  ax-un 7444
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2071  df-mo 2624  df-eu 2655  df-clab 2803  df-cleq 2817  df-clel 2896  df-nfc 2964  df-ne 3014  df-ral 3137  df-rex 3138  df-reu 3139  df-rmo 3140  df-rab 3141  df-v 3481  df-sbc 3758  df-csb 3866  df-dif 3921  df-un 3923  df-in 3925  df-ss 3935  df-pss 3937  df-nul 4275  df-if 4449  df-pw 4522  df-sn 4549  df-pr 4551  df-tp 4553  df-op 4555  df-uni 4820  df-int 4858  df-iun 4902  df-iin 4903  df-br 5048  df-opab 5110  df-mpt 5128  df-tr 5154  df-id 5441  df-eprel 5446  df-po 5455  df-so 5456  df-fr 5495  df-se 5496  df-we 5497  df-xp 5542  df-rel 5543  df-cnv 5544  df-co 5545  df-dm 5546  df-rn 5547  df-res 5548  df-ima 5549  df-pred 6129  df-ord 6175  df-on 6176  df-lim 6177  df-suc 6178  df-iota 6295  df-fun 6338  df-fn 6339  df-f 6340  df-f1 6341  df-fo 6342  df-f1o 6343  df-fv 6344  df-isom 6345  df-riota 7096  df-wrecs 7930  df-recs 7991  df-er 8272  df-en 8493  df-dom 8494  df-card 9352  df-cf 9354
This theorem is referenced by:  cfslbn  9674  cfslb2n  9675  rankcf  10184
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