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Mirrors > Home > MPE Home > Th. List > Mathboxes > inaex | Structured version Visualization version GIF version |
Description: Assuming the Tarski-Grothendieck axiom, every ordinal is contained in an inaccessible ordinal. (Contributed by Rohan Ridenour, 13-Aug-2023.) |
Ref | Expression |
---|---|
inaex | ⊢ (𝐴 ∈ On → ∃𝑥 ∈ Inacc 𝐴 ∈ 𝑥) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | inawina 10109 | . . . . . . 7 ⊢ (𝑥 ∈ Inacc → 𝑥 ∈ Inaccw) | |
2 | winaon 10107 | . . . . . . 7 ⊢ (𝑥 ∈ Inaccw → 𝑥 ∈ On) | |
3 | 1, 2 | syl 17 | . . . . . 6 ⊢ (𝑥 ∈ Inacc → 𝑥 ∈ On) |
4 | 3 | ssriv 3968 | . . . . 5 ⊢ Inacc ⊆ On |
5 | onmindif 6277 | . . . . 5 ⊢ ((Inacc ⊆ On ∧ 𝐴 ∈ On) → 𝐴 ∈ ∩ (Inacc ∖ suc 𝐴)) | |
6 | 4, 5 | mpan 688 | . . . 4 ⊢ (𝐴 ∈ On → 𝐴 ∈ ∩ (Inacc ∖ suc 𝐴)) |
7 | 6 | adantr 483 | . . 3 ⊢ ((𝐴 ∈ On ∧ 𝑥 = ∩ (Inacc ∖ suc 𝐴)) → 𝐴 ∈ ∩ (Inacc ∖ suc 𝐴)) |
8 | simpr 487 | . . 3 ⊢ ((𝐴 ∈ On ∧ 𝑥 = ∩ (Inacc ∖ suc 𝐴)) → 𝑥 = ∩ (Inacc ∖ suc 𝐴)) | |
9 | 7, 8 | eleqtrrd 2915 | . 2 ⊢ ((𝐴 ∈ On ∧ 𝑥 = ∩ (Inacc ∖ suc 𝐴)) → 𝐴 ∈ 𝑥) |
10 | difss 4105 | . . . . 5 ⊢ (Inacc ∖ suc 𝐴) ⊆ Inacc | |
11 | 10, 4 | sstri 3973 | . . . 4 ⊢ (Inacc ∖ suc 𝐴) ⊆ On |
12 | inaprc 10255 | . . . . . . 7 ⊢ Inacc ∉ V | |
13 | 12 | neli 3124 | . . . . . 6 ⊢ ¬ Inacc ∈ V |
14 | ssdif0 4320 | . . . . . . 7 ⊢ (Inacc ⊆ suc 𝐴 ↔ (Inacc ∖ suc 𝐴) = ∅) | |
15 | sucexg 7522 | . . . . . . . 8 ⊢ (𝐴 ∈ On → suc 𝐴 ∈ V) | |
16 | ssexg 5224 | . . . . . . . . 9 ⊢ ((Inacc ⊆ suc 𝐴 ∧ suc 𝐴 ∈ V) → Inacc ∈ V) | |
17 | 16 | expcom 416 | . . . . . . . 8 ⊢ (suc 𝐴 ∈ V → (Inacc ⊆ suc 𝐴 → Inacc ∈ V)) |
18 | 15, 17 | syl 17 | . . . . . . 7 ⊢ (𝐴 ∈ On → (Inacc ⊆ suc 𝐴 → Inacc ∈ V)) |
19 | 14, 18 | syl5bir 245 | . . . . . 6 ⊢ (𝐴 ∈ On → ((Inacc ∖ suc 𝐴) = ∅ → Inacc ∈ V)) |
20 | 13, 19 | mtoi 201 | . . . . 5 ⊢ (𝐴 ∈ On → ¬ (Inacc ∖ suc 𝐴) = ∅) |
21 | 20 | neqned 3022 | . . . 4 ⊢ (𝐴 ∈ On → (Inacc ∖ suc 𝐴) ≠ ∅) |
22 | onint 7507 | . . . 4 ⊢ (((Inacc ∖ suc 𝐴) ⊆ On ∧ (Inacc ∖ suc 𝐴) ≠ ∅) → ∩ (Inacc ∖ suc 𝐴) ∈ (Inacc ∖ suc 𝐴)) | |
23 | 11, 21, 22 | sylancr 589 | . . 3 ⊢ (𝐴 ∈ On → ∩ (Inacc ∖ suc 𝐴) ∈ (Inacc ∖ suc 𝐴)) |
24 | 23 | eldifad 3945 | . 2 ⊢ (𝐴 ∈ On → ∩ (Inacc ∖ suc 𝐴) ∈ Inacc) |
25 | 9, 24 | rspcime 3626 | 1 ⊢ (𝐴 ∈ On → ∃𝑥 ∈ Inacc 𝐴 ∈ 𝑥) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 = wceq 1536 ∈ wcel 2113 ≠ wne 3015 ∃wrex 3138 Vcvv 3493 ∖ cdif 3930 ⊆ wss 3933 ∅c0 4288 ∩ cint 4873 Oncon0 6188 suc csuc 6190 Inaccwcwina 10101 Inacccina 10102 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1969 ax-7 2014 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2160 ax-12 2176 ax-ext 2792 ax-rep 5187 ax-sep 5200 ax-nul 5207 ax-pow 5263 ax-pr 5327 ax-un 7458 ax-inf2 9101 ax-ac2 9882 ax-groth 10242 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1083 df-3an 1084 df-tru 1539 df-ex 1780 df-nf 1784 df-sb 2069 df-mo 2621 df-eu 2653 df-clab 2799 df-cleq 2813 df-clel 2892 df-nfc 2962 df-ne 3016 df-nel 3123 df-ral 3142 df-rex 3143 df-reu 3144 df-rmo 3145 df-rab 3146 df-v 3495 df-sbc 3771 df-csb 3881 df-dif 3936 df-un 3938 df-in 3940 df-ss 3949 df-pss 3951 df-nul 4289 df-if 4465 df-pw 4538 df-sn 4565 df-pr 4567 df-tp 4569 df-op 4571 df-uni 4836 df-int 4874 df-iun 4918 df-iin 4919 df-br 5064 df-opab 5126 df-mpt 5144 df-tr 5170 df-id 5457 df-eprel 5462 df-po 5471 df-so 5472 df-fr 5511 df-se 5512 df-we 5513 df-xp 5558 df-rel 5559 df-cnv 5560 df-co 5561 df-dm 5562 df-rn 5563 df-res 5564 df-ima 5565 df-pred 6145 df-ord 6191 df-on 6192 df-lim 6193 df-suc 6194 df-iota 6311 df-fun 6354 df-fn 6355 df-f 6356 df-f1 6357 df-fo 6358 df-f1o 6359 df-fv 6360 df-isom 6361 df-riota 7111 df-ov 7156 df-oprab 7157 df-mpo 7158 df-om 7578 df-1st 7686 df-2nd 7687 df-wrecs 7944 df-smo 7980 df-recs 8005 df-rdg 8043 df-1o 8099 df-2o 8100 df-oadd 8103 df-er 8286 df-map 8405 df-ixp 8459 df-en 8507 df-dom 8508 df-sdom 8509 df-fin 8510 df-oi 8971 df-har 9019 df-r1 9190 df-card 9365 df-aleph 9366 df-cf 9367 df-acn 9368 df-ac 9539 df-wina 10103 df-ina 10104 df-tsk 10168 |
This theorem is referenced by: gruex 40708 |
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