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| Mirrors > Home > MPE Home > Th. List > Mathboxes > finorwe | Structured version Visualization version GIF version | ||
| Description: If the Axiom of Infinity is denied, every total order is a well-order. The notion of a well-order cannot be usefully expressed without the Axiom of Infinity due to the inability to quantify over proper classes. (Contributed by ML, 5-Oct-2023.) |
| Ref | Expression |
|---|---|
| finorwe | ⊢ (¬ ω ∈ V → ( < Or 𝐴 → < We 𝐴)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | simpl 488 | . . . . . . . 8 ⊢ ((¬ ω ∈ V ∧ < Or 𝐴) → ¬ ω ∈ V) | |
| 2 | soss 5579 | . . . . . . . . . 10 ⊢ (𝑥 ⊆ 𝐴 → ( < Or 𝐴 → < Or 𝑥)) | |
| 3 | 2 | com12 33 | . . . . . . . . 9 ⊢ ( < Or 𝐴 → (𝑥 ⊆ 𝐴 → < Or 𝑥)) |
| 4 | 3 | adantl 487 | . . . . . . . 8 ⊢ ((¬ ω ∈ V ∧ < Or 𝐴) → (𝑥 ⊆ 𝐴 → < Or 𝑥)) |
| 5 | vex 3454 | . . . . . . . . . 10 ⊢ 𝑥 ∈ V | |
| 6 | fineqv 9266 | . . . . . . . . . . 11 ⊢ (¬ ω ∈ V ↔ Fin = V) | |
| 7 | 6 | biimpi 219 | . . . . . . . . . 10 ⊢ (¬ ω ∈ V → Fin = V) |
| 8 | 5, 7 | eleqtrrid 2867 | . . . . . . . . 9 ⊢ (¬ ω ∈ V → 𝑥 ∈ Fin) |
| 9 | wofi 9288 | . . . . . . . . . 10 ⊢ (( < Or 𝑥 ∧ 𝑥 ∈ Fin) → < We 𝑥) | |
| 10 | 9 | ancoms 464 | . . . . . . . . 9 ⊢ ((𝑥 ∈ Fin ∧ < Or 𝑥) → < We 𝑥) |
| 11 | 8, 10 | sylan 592 | . . . . . . . 8 ⊢ ((¬ ω ∈ V ∧ < Or 𝑥) → < We 𝑥) |
| 12 | 1, 4, 11 | syl6an 697 | . . . . . . 7 ⊢ ((¬ ω ∈ V ∧ < Or 𝐴) → (𝑥 ⊆ 𝐴 → < We 𝑥)) |
| 13 | ssid 3931 | . . . . . . . . 9 ⊢ 𝑥 ⊆ 𝑥 | |
| 14 | wereu 5647 | . . . . . . . . . . 11 ⊢ (( < We 𝑥 ∧ (𝑥 ∈ V ∧ 𝑥 ⊆ 𝑥 ∧ 𝑥 ≠ ∅)) → ∃!𝑦 ∈ 𝑥 ∀𝑧 ∈ 𝑥 ¬ 𝑧 < 𝑦) | |
| 15 | reurex 3369 | . . . . . . . . . . 11 ⊢ (∃!𝑦 ∈ 𝑥 ∀𝑧 ∈ 𝑥 ¬ 𝑧 < 𝑦 → ∃𝑦 ∈ 𝑥 ∀𝑧 ∈ 𝑥 ¬ 𝑧 < 𝑦) | |
| 16 | 14, 15 | syl 18 | . . . . . . . . . 10 ⊢ (( < We 𝑥 ∧ (𝑥 ∈ V ∧ 𝑥 ⊆ 𝑥 ∧ 𝑥 ≠ ∅)) → ∃𝑦 ∈ 𝑥 ∀𝑧 ∈ 𝑥 ¬ 𝑧 < 𝑦) |
| 17 | 5, 16 | mp3anr1 1487 | . . . . . . . . 9 ⊢ (( < We 𝑥 ∧ (𝑥 ⊆ 𝑥 ∧ 𝑥 ≠ ∅)) → ∃𝑦 ∈ 𝑥 ∀𝑧 ∈ 𝑥 ¬ 𝑧 < 𝑦) |
| 18 | 13, 17 | mpanr1 716 | . . . . . . . 8 ⊢ (( < We 𝑥 ∧ 𝑥 ≠ ∅) → ∃𝑦 ∈ 𝑥 ∀𝑧 ∈ 𝑥 ¬ 𝑧 < 𝑦) |
| 19 | 18 | ex 418 | . . . . . . 7 ⊢ ( < We 𝑥 → (𝑥 ≠ ∅ → ∃𝑦 ∈ 𝑥 ∀𝑧 ∈ 𝑥 ¬ 𝑧 < 𝑦)) |
| 20 | 12, 19 | syl6 36 | . . . . . 6 ⊢ ((¬ ω ∈ V ∧ < Or 𝐴) → (𝑥 ⊆ 𝐴 → (𝑥 ≠ ∅ → ∃𝑦 ∈ 𝑥 ∀𝑧 ∈ 𝑥 ¬ 𝑧 < 𝑦))) |
| 21 | 20 | impd 416 | . . . . 5 ⊢ ((¬ ω ∈ V ∧ < Or 𝐴) → ((𝑥 ⊆ 𝐴 ∧ 𝑥 ≠ ∅) → ∃𝑦 ∈ 𝑥 ∀𝑧 ∈ 𝑥 ¬ 𝑧 < 𝑦)) |
| 22 | 21 | alrimiv 1959 | . . . 4 ⊢ ((¬ ω ∈ V ∧ < Or 𝐴) → ∀𝑥((𝑥 ⊆ 𝐴 ∧ 𝑥 ≠ ∅) → ∃𝑦 ∈ 𝑥 ∀𝑧 ∈ 𝑥 ¬ 𝑧 < 𝑦)) |
| 23 | df-fr 5604 | . . . 4 ⊢ ( < Fr 𝐴 ↔ ∀𝑥((𝑥 ⊆ 𝐴 ∧ 𝑥 ≠ ∅) → ∃𝑦 ∈ 𝑥 ∀𝑧 ∈ 𝑥 ¬ 𝑧 < 𝑦)) | |
| 24 | 22, 23 | sylibr 237 | . . 3 ⊢ ((¬ ω ∈ V ∧ < Or 𝐴) → < Fr 𝐴) |
| 25 | simpr 490 | . . 3 ⊢ ((¬ ω ∈ V ∧ < Or 𝐴) → < Or 𝐴) | |
| 26 | df-we 5606 | . . 3 ⊢ ( < We 𝐴 ↔ ( < Fr 𝐴 ∧ < Or 𝐴)) | |
| 27 | 24, 25, 26 | sylanbrc 595 | . 2 ⊢ ((¬ ω ∈ V ∧ < Or 𝐴) → < We 𝐴) |
| 28 | 27 | ex 418 | 1 ⊢ (¬ ω ∈ V → ( < Or 𝐴 → < We 𝐴)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ∧ wa 401 ∧ w3a 1103 ∀wal 1567 = wceq 1569 ∈ wcel 2144 ≠ wne 2955 ∀wral 3076 ∃wrex 3086 ∃!wreu 3363 Vcvv 3450 ⊆ wss 3896 ∅c0 4277 class class class wbr 5102 Or wor 5558 Fr wfr 5601 We wwe 5603 ωcom 7881 Fincfn 8981 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-rep 5231 ax-sep 5248 ax-nul 5259 ax-pow 5327 ax-pr 5391 ax-un 7755 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 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 3739 df-csb 3848 df-ss 3897 df-pss 4013 df-dif 4046 df-in 4090 df-un 4150 df-nul 4278 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6497 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-om 7882 df-1o 8484 df-er 8725 df-en 8982 df-dom 8983 df-sdom 8984 df-fin 8985 |
| This theorem is used by: (None) |
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