| Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
| 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 10259 | . . . . 5 ⊢ (cf‘𝐴) ∈ On | |
| 2 | eleq1 2848 | . . . . 5 ⊢ ((cf‘𝐴) = 𝐴 → ((cf‘𝐴) ∈ On ↔ 𝐴 ∈ On)) | |
| 3 | 1, 2 | mpbii 236 | . . . 4 ⊢ ((cf‘𝐴) = 𝐴 → 𝐴 ∈ On) |
| 4 | 3 | 3ad2ant2 1152 | . . 3 ⊢ ((𝐴 ≠ ∅ ∧ (cf‘𝐴) = 𝐴 ∧ ∀𝑥 ∈ 𝐴 𝒫 𝑥 ≺ 𝐴) → 𝐴 ∈ On) |
| 5 | idd 25 | . . . 4 ⊢ (𝐴 ∈ On → (𝐴 ≠ ∅ → 𝐴 ≠ ∅)) | |
| 6 | idd 25 | . . . 4 ⊢ (𝐴 ∈ On → ((cf‘𝐴) = 𝐴 → (cf‘𝐴) = 𝐴)) | |
| 7 | inawinalem 10701 | . . . 4 ⊢ (𝐴 ∈ On → (∀𝑥 ∈ 𝐴 𝒫 𝑥 ≺ 𝐴 → ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐴 𝑥 ≺ 𝑦)) | |
| 8 | 5, 6, 7 | 3anim123d 1471 | . . 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 39 | . 2 ⊢ ((𝐴 ≠ ∅ ∧ (cf‘𝐴) = 𝐴 ∧ ∀𝑥 ∈ 𝐴 𝒫 𝑥 ≺ 𝐴) → (𝐴 ≠ ∅ ∧ (cf‘𝐴) = 𝐴 ∧ ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐴 𝑥 ≺ 𝑦)) |
| 10 | elina 10699 | . 2 ⊢ (𝐴 ∈ Inacc ↔ (𝐴 ≠ ∅ ∧ (cf‘𝐴) = 𝐴 ∧ ∀𝑥 ∈ 𝐴 𝒫 𝑥 ≺ 𝐴)) | |
| 11 | elwina 10698 | . 2 ⊢ (𝐴 ∈ Inaccw ↔ (𝐴 ≠ ∅ ∧ (cf‘𝐴) = 𝐴 ∧ ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐴 𝑥 ≺ 𝑦)) | |
| 12 | 9, 10, 11 | 3imtr4i 295 | 1 ⊢ (𝐴 ∈ Inacc → 𝐴 ∈ Inaccw) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ w3a 1103 = wceq 1570 ∈ wcel 2145 ≠ wne 2955 ∀wral 3076 ∃wrex 3086 ∅c0 4279 𝒫 cpw 4557 class class class wbr 5103 Oncon0 6357 ‘cfv 6533 ≺ csdm 8954 cfccf 9945 Inaccwcwina 10694 Inacccina 10695 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-rep 5232 ax-sep 5251 ax-nul 5263 ax-pow 5330 ax-pr 5398 ax-un 7737 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-int 4908 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5550 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-se 5609 df-we 5610 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-pred 6299 df-ord 6360 df-on 6361 df-suc 6363 df-iota 6489 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-isom 6542 df-riota 7371 df-ov 7417 df-2nd 7988 df-frecs 8281 df-wrecs 8312 df-recs 8361 df-er 8699 df-en 8956 df-dom 8957 df-sdom 8958 df-card 9947 df-cf 9949 df-wina 10696 df-ina 10697 |
| This theorem is used by: gchina 10711 inar1 10787 inatsk 10790 tskuni 10795 grur1a 10831 grur1 10832 inaprc 10848 inaex 45124 gruex 45125 |
| Copyright terms: Public domain | W3C validator |