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Theorem gchaleph2 10083
 Description: If (ℵ‘𝐴) and (ℵ‘suc 𝐴) are GCH-sets, then the successor aleph (ℵ‘suc 𝐴) is equinumerous to the powerset of (ℵ‘𝐴). (Contributed by Mario Carneiro, 31-May-2015.)
Assertion
Ref Expression
gchaleph2 ((𝐴 ∈ On ∧ (ℵ‘𝐴) ∈ GCH ∧ (ℵ‘suc 𝐴) ∈ GCH) → (ℵ‘suc 𝐴) ≈ 𝒫 (ℵ‘𝐴))

Proof of Theorem gchaleph2
StepHypRef Expression
1 harcl 9011 . . 3 (har‘(ℵ‘𝐴)) ∈ On
2 alephon 9484 . . . . 5 (ℵ‘𝐴) ∈ On
3 onenon 9366 . . . . 5 ((ℵ‘𝐴) ∈ On → (ℵ‘𝐴) ∈ dom card)
4 harsdom 9412 . . . . 5 ((ℵ‘𝐴) ∈ dom card → (ℵ‘𝐴) ≺ (har‘(ℵ‘𝐴)))
52, 3, 4mp2b 10 . . . 4 (ℵ‘𝐴) ≺ (har‘(ℵ‘𝐴))
6 simp1 1133 . . . . . . 7 ((𝐴 ∈ On ∧ (ℵ‘𝐴) ∈ GCH ∧ (ℵ‘suc 𝐴) ∈ GCH) → 𝐴 ∈ On)
7 alephgeom 9497 . . . . . . 7 (𝐴 ∈ On ↔ ω ⊆ (ℵ‘𝐴))
86, 7sylib 221 . . . . . 6 ((𝐴 ∈ On ∧ (ℵ‘𝐴) ∈ GCH ∧ (ℵ‘suc 𝐴) ∈ GCH) → ω ⊆ (ℵ‘𝐴))
9 ssdomg 8542 . . . . . 6 ((ℵ‘𝐴) ∈ On → (ω ⊆ (ℵ‘𝐴) → ω ≼ (ℵ‘𝐴)))
102, 8, 9mpsyl 68 . . . . 5 ((𝐴 ∈ On ∧ (ℵ‘𝐴) ∈ GCH ∧ (ℵ‘suc 𝐴) ∈ GCH) → ω ≼ (ℵ‘𝐴))
11 simp2 1134 . . . . 5 ((𝐴 ∈ On ∧ (ℵ‘𝐴) ∈ GCH ∧ (ℵ‘suc 𝐴) ∈ GCH) → (ℵ‘𝐴) ∈ GCH)
12 alephsuc 9483 . . . . . . 7 (𝐴 ∈ On → (ℵ‘suc 𝐴) = (har‘(ℵ‘𝐴)))
136, 12syl 17 . . . . . 6 ((𝐴 ∈ On ∧ (ℵ‘𝐴) ∈ GCH ∧ (ℵ‘suc 𝐴) ∈ GCH) → (ℵ‘suc 𝐴) = (har‘(ℵ‘𝐴)))
14 simp3 1135 . . . . . 6 ((𝐴 ∈ On ∧ (ℵ‘𝐴) ∈ GCH ∧ (ℵ‘suc 𝐴) ∈ GCH) → (ℵ‘suc 𝐴) ∈ GCH)
1513, 14eqeltrrd 2915 . . . . 5 ((𝐴 ∈ On ∧ (ℵ‘𝐴) ∈ GCH ∧ (ℵ‘suc 𝐴) ∈ GCH) → (har‘(ℵ‘𝐴)) ∈ GCH)
16 gchpwdom 10081 . . . . 5 ((ω ≼ (ℵ‘𝐴) ∧ (ℵ‘𝐴) ∈ GCH ∧ (har‘(ℵ‘𝐴)) ∈ GCH) → ((ℵ‘𝐴) ≺ (har‘(ℵ‘𝐴)) ↔ 𝒫 (ℵ‘𝐴) ≼ (har‘(ℵ‘𝐴))))
1710, 11, 15, 16syl3anc 1368 . . . 4 ((𝐴 ∈ On ∧ (ℵ‘𝐴) ∈ GCH ∧ (ℵ‘suc 𝐴) ∈ GCH) → ((ℵ‘𝐴) ≺ (har‘(ℵ‘𝐴)) ↔ 𝒫 (ℵ‘𝐴) ≼ (har‘(ℵ‘𝐴))))
185, 17mpbii 236 . . 3 ((𝐴 ∈ On ∧ (ℵ‘𝐴) ∈ GCH ∧ (ℵ‘suc 𝐴) ∈ GCH) → 𝒫 (ℵ‘𝐴) ≼ (har‘(ℵ‘𝐴)))
19 ondomen 9452 . . 3 (((har‘(ℵ‘𝐴)) ∈ On ∧ 𝒫 (ℵ‘𝐴) ≼ (har‘(ℵ‘𝐴))) → 𝒫 (ℵ‘𝐴) ∈ dom card)
201, 18, 19sylancr 590 . 2 ((𝐴 ∈ On ∧ (ℵ‘𝐴) ∈ GCH ∧ (ℵ‘suc 𝐴) ∈ GCH) → 𝒫 (ℵ‘𝐴) ∈ dom card)
21 gchaleph 10082 . 2 ((𝐴 ∈ On ∧ (ℵ‘𝐴) ∈ GCH ∧ 𝒫 (ℵ‘𝐴) ∈ dom card) → (ℵ‘suc 𝐴) ≈ 𝒫 (ℵ‘𝐴))
2220, 21syld3an3 1406 1 ((𝐴 ∈ On ∧ (ℵ‘𝐴) ∈ GCH ∧ (ℵ‘suc 𝐴) ∈ GCH) → (ℵ‘suc 𝐴) ≈ 𝒫 (ℵ‘𝐴))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 209   ∧ w3a 1084   = wceq 1538   ∈ wcel 2114   ⊆ wss 3908  𝒫 cpw 4511   class class class wbr 5042  dom cdm 5532  Oncon0 6169  suc csuc 6171  ‘cfv 6334  ωcom 7565   ≈ cen 8493   ≼ cdom 8494   ≺ csdm 8495  harchar 9008  cardccrd 9352  ℵcale 9353  GCHcgch 10031 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 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2178  ax-ext 2794  ax-rep 5166  ax-sep 5179  ax-nul 5186  ax-pow 5243  ax-pr 5307  ax-un 7446  ax-inf2 9092 This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-fal 1551  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2622  df-eu 2653  df-clab 2801  df-cleq 2815  df-clel 2894  df-nfc 2962  df-ne 3012  df-ral 3135  df-rex 3136  df-reu 3137  df-rmo 3138  df-rab 3139  df-v 3471  df-sbc 3748  df-csb 3856  df-dif 3911  df-un 3913  df-in 3915  df-ss 3925  df-pss 3927  df-nul 4266  df-if 4440  df-pw 4513  df-sn 4540  df-pr 4542  df-tp 4544  df-op 4546  df-uni 4814  df-int 4852  df-iun 4896  df-br 5043  df-opab 5105  df-mpt 5123  df-tr 5149  df-id 5437  df-eprel 5442  df-po 5451  df-so 5452  df-fr 5491  df-se 5492  df-we 5493  df-xp 5538  df-rel 5539  df-cnv 5540  df-co 5541  df-dm 5542  df-rn 5543  df-res 5544  df-ima 5545  df-pred 6126  df-ord 6172  df-on 6173  df-lim 6174  df-suc 6175  df-iota 6293  df-fun 6336  df-fn 6337  df-f 6338  df-f1 6339  df-fo 6340  df-f1o 6341  df-fv 6342  df-isom 6343  df-riota 7098  df-ov 7143  df-oprab 7144  df-mpo 7145  df-om 7566  df-1st 7675  df-2nd 7676  df-supp 7818  df-wrecs 7934  df-recs 7995  df-rdg 8033  df-seqom 8071  df-1o 8089  df-2o 8090  df-oadd 8093  df-omul 8094  df-oexp 8095  df-er 8276  df-map 8395  df-en 8497  df-dom 8498  df-sdom 8499  df-fin 8500  df-fsupp 8822  df-oi 8962  df-har 9009  df-wdom 9017  df-cnf 9113  df-dju 9318  df-card 9356  df-aleph 9357  df-fin4 9698  df-gch 10032 This theorem is referenced by:  gch2  10086  gch3  10087
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