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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 10177 | . . . . 5 ⊢ (cf‘𝐴) ∈ On | |
| 2 | eleq1 2824 | . . . . 5 ⊢ ((cf‘𝐴) = 𝐴 → ((cf‘𝐴) ∈ On ↔ 𝐴 ∈ On)) | |
| 3 | 1, 2 | mpbii 233 | . . . 4 ⊢ ((cf‘𝐴) = 𝐴 → 𝐴 ∈ On) |
| 4 | 3 | 3ad2ant2 1135 | . . 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 10612 | . . . 4 ⊢ (𝐴 ∈ On → (∀𝑥 ∈ 𝐴 𝒫 𝑥 ≺ 𝐴 → ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐴 𝑥 ≺ 𝑦)) | |
| 8 | 5, 6, 7 | 3anim123d 1446 | . . 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 10610 | . 2 ⊢ (𝐴 ∈ Inacc ↔ (𝐴 ≠ ∅ ∧ (cf‘𝐴) = 𝐴 ∧ ∀𝑥 ∈ 𝐴 𝒫 𝑥 ≺ 𝐴)) | |
| 11 | elwina 10609 | . 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 1087 = wceq 1542 ∈ wcel 2114 ≠ wne 2932 ∀wral 3051 ∃wrex 3061 ∅c0 4273 𝒫 cpw 4541 class class class wbr 5085 Oncon0 6323 ‘cfv 6498 ≺ csdm 8892 cfccf 9861 Inaccwcwina 10605 Inacccina 10606 |
| 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 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2708 ax-rep 5212 ax-sep 5231 ax-nul 5241 ax-pow 5307 ax-pr 5375 ax-un 7689 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-ral 3052 df-rex 3062 df-rmo 3342 df-reu 3343 df-rab 3390 df-v 3431 df-sbc 3729 df-csb 3838 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-pss 3909 df-nul 4274 df-if 4467 df-pw 4543 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-int 4890 df-iun 4935 df-br 5086 df-opab 5148 df-mpt 5167 df-tr 5193 df-id 5526 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-se 5585 df-we 5586 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-pred 6265 df-ord 6326 df-on 6327 df-suc 6329 df-iota 6454 df-fun 6500 df-fn 6501 df-f 6502 df-f1 6503 df-fo 6504 df-f1o 6505 df-fv 6506 df-isom 6507 df-riota 7324 df-ov 7370 df-2nd 7943 df-frecs 8231 df-wrecs 8262 df-recs 8311 df-er 8643 df-en 8894 df-dom 8895 df-sdom 8896 df-card 9863 df-cf 9865 df-wina 10607 df-ina 10608 |
| This theorem is referenced by: gchina 10622 inar1 10698 inatsk 10701 tskuni 10706 grur1a 10742 grur1 10743 inaprc 10759 inaex 44724 gruex 44725 |
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