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Mirrors > Home > MPE Home > Th. List > gch3 | Structured version Visualization version GIF version |
Description: An equivalent formulation of the generalized continuum hypothesis. (Contributed by Mario Carneiro, 15-May-2015.) |
Ref | Expression |
---|---|
gch3 | ⊢ (GCH = V ↔ ∀𝑥 ∈ On (ℵ‘suc 𝑥) ≈ 𝒫 (ℵ‘𝑥)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpr 488 | . . . 4 ⊢ ((GCH = V ∧ 𝑥 ∈ On) → 𝑥 ∈ On) | |
2 | fvex 6658 | . . . . 5 ⊢ (ℵ‘𝑥) ∈ V | |
3 | simpl 486 | . . . . 5 ⊢ ((GCH = V ∧ 𝑥 ∈ On) → GCH = V) | |
4 | 2, 3 | eleqtrrid 2897 | . . . 4 ⊢ ((GCH = V ∧ 𝑥 ∈ On) → (ℵ‘𝑥) ∈ GCH) |
5 | fvex 6658 | . . . . 5 ⊢ (ℵ‘suc 𝑥) ∈ V | |
6 | 5, 3 | eleqtrrid 2897 | . . . 4 ⊢ ((GCH = V ∧ 𝑥 ∈ On) → (ℵ‘suc 𝑥) ∈ GCH) |
7 | gchaleph2 10083 | . . . 4 ⊢ ((𝑥 ∈ On ∧ (ℵ‘𝑥) ∈ GCH ∧ (ℵ‘suc 𝑥) ∈ GCH) → (ℵ‘suc 𝑥) ≈ 𝒫 (ℵ‘𝑥)) | |
8 | 1, 4, 6, 7 | syl3anc 1368 | . . 3 ⊢ ((GCH = V ∧ 𝑥 ∈ On) → (ℵ‘suc 𝑥) ≈ 𝒫 (ℵ‘𝑥)) |
9 | 8 | ralrimiva 3149 | . 2 ⊢ (GCH = V → ∀𝑥 ∈ On (ℵ‘suc 𝑥) ≈ 𝒫 (ℵ‘𝑥)) |
10 | alephgch 10085 | . . . . . 6 ⊢ ((ℵ‘suc 𝑥) ≈ 𝒫 (ℵ‘𝑥) → (ℵ‘𝑥) ∈ GCH) | |
11 | 10 | ralimi 3128 | . . . . 5 ⊢ (∀𝑥 ∈ On (ℵ‘suc 𝑥) ≈ 𝒫 (ℵ‘𝑥) → ∀𝑥 ∈ On (ℵ‘𝑥) ∈ GCH) |
12 | alephfnon 9476 | . . . . . 6 ⊢ ℵ Fn On | |
13 | ffnfv 6859 | . . . . . 6 ⊢ (ℵ:On⟶GCH ↔ (ℵ Fn On ∧ ∀𝑥 ∈ On (ℵ‘𝑥) ∈ GCH)) | |
14 | 12, 13 | mpbiran 708 | . . . . 5 ⊢ (ℵ:On⟶GCH ↔ ∀𝑥 ∈ On (ℵ‘𝑥) ∈ GCH) |
15 | 11, 14 | sylibr 237 | . . . 4 ⊢ (∀𝑥 ∈ On (ℵ‘suc 𝑥) ≈ 𝒫 (ℵ‘𝑥) → ℵ:On⟶GCH) |
16 | 15 | frnd 6494 | . . 3 ⊢ (∀𝑥 ∈ On (ℵ‘suc 𝑥) ≈ 𝒫 (ℵ‘𝑥) → ran ℵ ⊆ GCH) |
17 | gch2 10086 | . . 3 ⊢ (GCH = V ↔ ran ℵ ⊆ GCH) | |
18 | 16, 17 | sylibr 237 | . 2 ⊢ (∀𝑥 ∈ On (ℵ‘suc 𝑥) ≈ 𝒫 (ℵ‘𝑥) → GCH = V) |
19 | 9, 18 | impbii 212 | 1 ⊢ (GCH = V ↔ ∀𝑥 ∈ On (ℵ‘suc 𝑥) ≈ 𝒫 (ℵ‘𝑥)) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 209 ∧ wa 399 = wceq 1538 ∈ wcel 2111 ∀wral 3106 Vcvv 3441 ⊆ wss 3881 𝒫 cpw 4497 class class class wbr 5030 ran crn 5520 Oncon0 6159 suc csuc 6161 Fn wfn 6319 ⟶wf 6320 ‘cfv 6324 ≈ cen 8489 ℵcale 9349 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 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-rep 5154 ax-sep 5167 ax-nul 5174 ax-pow 5231 ax-pr 5295 ax-un 7441 ax-reg 9040 ax-inf2 9088 |
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 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ne 2988 df-ral 3111 df-rex 3112 df-reu 3113 df-rmo 3114 df-rab 3115 df-v 3443 df-sbc 3721 df-csb 3829 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-pss 3900 df-nul 4244 df-if 4426 df-pw 4499 df-sn 4526 df-pr 4528 df-tp 4530 df-op 4532 df-uni 4801 df-int 4839 df-iun 4883 df-br 5031 df-opab 5093 df-mpt 5111 df-tr 5137 df-id 5425 df-eprel 5430 df-po 5438 df-so 5439 df-fr 5478 df-se 5479 df-we 5480 df-xp 5525 df-rel 5526 df-cnv 5527 df-co 5528 df-dm 5529 df-rn 5530 df-res 5531 df-ima 5532 df-pred 6116 df-ord 6162 df-on 6163 df-lim 6164 df-suc 6165 df-iota 6283 df-fun 6326 df-fn 6327 df-f 6328 df-f1 6329 df-fo 6330 df-f1o 6331 df-fv 6332 df-isom 6333 df-riota 7093 df-ov 7138 df-oprab 7139 df-mpo 7140 df-om 7561 df-1st 7671 df-2nd 7672 df-supp 7814 df-wrecs 7930 df-recs 7991 df-rdg 8029 df-seqom 8067 df-1o 8085 df-2o 8086 df-oadd 8089 df-omul 8090 df-oexp 8091 df-er 8272 df-map 8391 df-en 8493 df-dom 8494 df-sdom 8495 df-fin 8496 df-fsupp 8818 df-oi 8958 df-har 9005 df-wdom 9013 df-cnf 9109 df-r1 9177 df-rank 9178 df-dju 9314 df-card 9352 df-aleph 9353 df-ac 9527 df-fin4 9698 df-gch 10032 |
This theorem is referenced by: (None) |
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