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| Mirrors > Home > MPE Home > Th. List > inawina | Structured version Visualization version GIF version | ||
| Description: Every strongly inaccessible cardinal is weakly inaccessible. (Contributed by Mario Carneiro, 29-May-2014.) |
| Ref | Expression |
|---|---|
| inawina | ⊢ (𝐴 ∈ Inacc → 𝐴 ∈ Inaccw) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cfon 10215 | . . . . 5 ⊢ (cf‘𝐴) ∈ On | |
| 2 | eleq1 2817 | . . . . 5 ⊢ ((cf‘𝐴) = 𝐴 → ((cf‘𝐴) ∈ On ↔ 𝐴 ∈ On)) | |
| 3 | 1, 2 | mpbii 233 | . . . 4 ⊢ ((cf‘𝐴) = 𝐴 → 𝐴 ∈ On) |
| 4 | 3 | 3ad2ant2 1134 | . . 3 ⊢ ((𝐴 ≠ ∅ ∧ (cf‘𝐴) = 𝐴 ∧ ∀𝑥 ∈ 𝐴 𝒫 𝑥 ≺ 𝐴) → 𝐴 ∈ On) |
| 5 | idd 24 | . . . 4 ⊢ (𝐴 ∈ On → (𝐴 ≠ ∅ → 𝐴 ≠ ∅)) | |
| 6 | idd 24 | . . . 4 ⊢ (𝐴 ∈ On → ((cf‘𝐴) = 𝐴 → (cf‘𝐴) = 𝐴)) | |
| 7 | inawinalem 10649 | . . . 4 ⊢ (𝐴 ∈ On → (∀𝑥 ∈ 𝐴 𝒫 𝑥 ≺ 𝐴 → ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐴 𝑥 ≺ 𝑦)) | |
| 8 | 5, 6, 7 | 3anim123d 1445 | . . 3 ⊢ (𝐴 ∈ On → ((𝐴 ≠ ∅ ∧ (cf‘𝐴) = 𝐴 ∧ ∀𝑥 ∈ 𝐴 𝒫 𝑥 ≺ 𝐴) → (𝐴 ≠ ∅ ∧ (cf‘𝐴) = 𝐴 ∧ ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐴 𝑥 ≺ 𝑦))) |
| 9 | 4, 8 | mpcom 38 | . 2 ⊢ ((𝐴 ≠ ∅ ∧ (cf‘𝐴) = 𝐴 ∧ ∀𝑥 ∈ 𝐴 𝒫 𝑥 ≺ 𝐴) → (𝐴 ≠ ∅ ∧ (cf‘𝐴) = 𝐴 ∧ ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐴 𝑥 ≺ 𝑦)) |
| 10 | elina 10647 | . 2 ⊢ (𝐴 ∈ Inacc ↔ (𝐴 ≠ ∅ ∧ (cf‘𝐴) = 𝐴 ∧ ∀𝑥 ∈ 𝐴 𝒫 𝑥 ≺ 𝐴)) | |
| 11 | elwina 10646 | . 2 ⊢ (𝐴 ∈ Inaccw ↔ (𝐴 ≠ ∅ ∧ (cf‘𝐴) = 𝐴 ∧ ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐴 𝑥 ≺ 𝑦)) | |
| 12 | 9, 10, 11 | 3imtr4i 292 | 1 ⊢ (𝐴 ∈ Inacc → 𝐴 ∈ Inaccw) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ w3a 1086 = wceq 1540 ∈ wcel 2109 ≠ wne 2926 ∀wral 3045 ∃wrex 3054 ∅c0 4299 𝒫 cpw 4566 class class class wbr 5110 Oncon0 6335 ‘cfv 6514 ≺ csdm 8920 cfccf 9897 Inaccwcwina 10642 Inacccina 10643 |
| 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 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2702 ax-rep 5237 ax-sep 5254 ax-nul 5264 ax-pow 5323 ax-pr 5390 ax-un 7714 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2534 df-eu 2563 df-clab 2709 df-cleq 2722 df-clel 2804 df-nfc 2879 df-ne 2927 df-ral 3046 df-rex 3055 df-rmo 3356 df-reu 3357 df-rab 3409 df-v 3452 df-sbc 3757 df-csb 3866 df-dif 3920 df-un 3922 df-in 3924 df-ss 3934 df-pss 3937 df-nul 4300 df-if 4492 df-pw 4568 df-sn 4593 df-pr 4595 df-op 4599 df-uni 4875 df-int 4914 df-iun 4960 df-br 5111 df-opab 5173 df-mpt 5192 df-tr 5218 df-id 5536 df-eprel 5541 df-po 5549 df-so 5550 df-fr 5594 df-se 5595 df-we 5596 df-xp 5647 df-rel 5648 df-cnv 5649 df-co 5650 df-dm 5651 df-rn 5652 df-res 5653 df-ima 5654 df-pred 6277 df-ord 6338 df-on 6339 df-suc 6341 df-iota 6467 df-fun 6516 df-fn 6517 df-f 6518 df-f1 6519 df-fo 6520 df-f1o 6521 df-fv 6522 df-isom 6523 df-riota 7347 df-ov 7393 df-2nd 7972 df-frecs 8263 df-wrecs 8294 df-recs 8343 df-er 8674 df-en 8922 df-dom 8923 df-sdom 8924 df-card 9899 df-cf 9901 df-wina 10644 df-ina 10645 |
| This theorem is referenced by: gchina 10659 inar1 10735 inatsk 10738 tskuni 10743 grur1a 10779 grur1 10780 inaprc 10796 inaex 44293 gruex 44294 |
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