Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > MPE Home > Th. List > fin56 | Structured version Visualization version GIF version |
Description: Every V-finite set is VI-finite because multiplication dominates addition for cardinals. (Contributed by Stefan O'Rear, 29-Oct-2014.) (Revised by Mario Carneiro, 17-May-2015.) |
Ref | Expression |
---|---|
fin56 | ⊢ (𝐴 ∈ FinV → 𝐴 ∈ FinVI) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | orc 399 | . . . . 5 ⊢ (𝐴 = ∅ → (𝐴 = ∅ ∨ 𝐴 ≈ 1𝑜)) | |
2 | sdom2en01 9007 | . . . . 5 ⊢ (𝐴 ≺ 2𝑜 ↔ (𝐴 = ∅ ∨ 𝐴 ≈ 1𝑜)) | |
3 | 1, 2 | sylibr 223 | . . . 4 ⊢ (𝐴 = ∅ → 𝐴 ≺ 2𝑜) |
4 | 3 | orcd 406 | . . 3 ⊢ (𝐴 = ∅ → (𝐴 ≺ 2𝑜 ∨ 𝐴 ≺ (𝐴 × 𝐴))) |
5 | onfin2 8037 | . . . . . . . 8 ⊢ ω = (On ∩ Fin) | |
6 | inss2 3796 | . . . . . . . 8 ⊢ (On ∩ Fin) ⊆ Fin | |
7 | 5, 6 | eqsstri 3598 | . . . . . . 7 ⊢ ω ⊆ Fin |
8 | 2onn 7607 | . . . . . . 7 ⊢ 2𝑜 ∈ ω | |
9 | 7, 8 | sselii 3565 | . . . . . 6 ⊢ 2𝑜 ∈ Fin |
10 | relsdom 7848 | . . . . . . 7 ⊢ Rel ≺ | |
11 | 10 | brrelexi 5082 | . . . . . 6 ⊢ (𝐴 ≺ (𝐴 +𝑐 𝐴) → 𝐴 ∈ V) |
12 | fidomtri 8702 | . . . . . 6 ⊢ ((2𝑜 ∈ Fin ∧ 𝐴 ∈ V) → (2𝑜 ≼ 𝐴 ↔ ¬ 𝐴 ≺ 2𝑜)) | |
13 | 9, 11, 12 | sylancr 694 | . . . . 5 ⊢ (𝐴 ≺ (𝐴 +𝑐 𝐴) → (2𝑜 ≼ 𝐴 ↔ ¬ 𝐴 ≺ 2𝑜)) |
14 | xp2cda 8885 | . . . . . . . . . 10 ⊢ (𝐴 ∈ V → (𝐴 × 2𝑜) = (𝐴 +𝑐 𝐴)) | |
15 | 11, 14 | syl 17 | . . . . . . . . 9 ⊢ (𝐴 ≺ (𝐴 +𝑐 𝐴) → (𝐴 × 2𝑜) = (𝐴 +𝑐 𝐴)) |
16 | 15 | adantr 480 | . . . . . . . 8 ⊢ ((𝐴 ≺ (𝐴 +𝑐 𝐴) ∧ 2𝑜 ≼ 𝐴) → (𝐴 × 2𝑜) = (𝐴 +𝑐 𝐴)) |
17 | xpdom2g 7941 | . . . . . . . . 9 ⊢ ((𝐴 ∈ V ∧ 2𝑜 ≼ 𝐴) → (𝐴 × 2𝑜) ≼ (𝐴 × 𝐴)) | |
18 | 11, 17 | sylan 487 | . . . . . . . 8 ⊢ ((𝐴 ≺ (𝐴 +𝑐 𝐴) ∧ 2𝑜 ≼ 𝐴) → (𝐴 × 2𝑜) ≼ (𝐴 × 𝐴)) |
19 | 16, 18 | eqbrtrrd 4607 | . . . . . . 7 ⊢ ((𝐴 ≺ (𝐴 +𝑐 𝐴) ∧ 2𝑜 ≼ 𝐴) → (𝐴 +𝑐 𝐴) ≼ (𝐴 × 𝐴)) |
20 | sdomdomtr 7978 | . . . . . . 7 ⊢ ((𝐴 ≺ (𝐴 +𝑐 𝐴) ∧ (𝐴 +𝑐 𝐴) ≼ (𝐴 × 𝐴)) → 𝐴 ≺ (𝐴 × 𝐴)) | |
21 | 19, 20 | syldan 486 | . . . . . 6 ⊢ ((𝐴 ≺ (𝐴 +𝑐 𝐴) ∧ 2𝑜 ≼ 𝐴) → 𝐴 ≺ (𝐴 × 𝐴)) |
22 | 21 | ex 449 | . . . . 5 ⊢ (𝐴 ≺ (𝐴 +𝑐 𝐴) → (2𝑜 ≼ 𝐴 → 𝐴 ≺ (𝐴 × 𝐴))) |
23 | 13, 22 | sylbird 249 | . . . 4 ⊢ (𝐴 ≺ (𝐴 +𝑐 𝐴) → (¬ 𝐴 ≺ 2𝑜 → 𝐴 ≺ (𝐴 × 𝐴))) |
24 | 23 | orrd 392 | . . 3 ⊢ (𝐴 ≺ (𝐴 +𝑐 𝐴) → (𝐴 ≺ 2𝑜 ∨ 𝐴 ≺ (𝐴 × 𝐴))) |
25 | 4, 24 | jaoi 393 | . 2 ⊢ ((𝐴 = ∅ ∨ 𝐴 ≺ (𝐴 +𝑐 𝐴)) → (𝐴 ≺ 2𝑜 ∨ 𝐴 ≺ (𝐴 × 𝐴))) |
26 | isfin5 9004 | . 2 ⊢ (𝐴 ∈ FinV ↔ (𝐴 = ∅ ∨ 𝐴 ≺ (𝐴 +𝑐 𝐴))) | |
27 | isfin6 9005 | . 2 ⊢ (𝐴 ∈ FinVI ↔ (𝐴 ≺ 2𝑜 ∨ 𝐴 ≺ (𝐴 × 𝐴))) | |
28 | 25, 26, 27 | 3imtr4i 280 | 1 ⊢ (𝐴 ∈ FinV → 𝐴 ∈ FinVI) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 195 ∨ wo 382 ∧ wa 383 = wceq 1475 ∈ wcel 1977 Vcvv 3173 ∩ cin 3539 ∅c0 3874 class class class wbr 4583 × cxp 5036 Oncon0 5640 (class class class)co 6549 ωcom 6957 1𝑜c1o 7440 2𝑜c2o 7441 ≈ cen 7838 ≼ cdom 7839 ≺ csdm 7840 Fincfn 7841 +𝑐 ccda 8872 FinVcfin5 8987 FinVIcfin6 8988 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-sep 4709 ax-nul 4717 ax-pow 4769 ax-pr 4833 ax-un 6847 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3or 1032 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-ral 2901 df-rex 2902 df-rab 2905 df-v 3175 df-sbc 3403 df-csb 3500 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-pss 3556 df-nul 3875 df-if 4037 df-pw 4110 df-sn 4126 df-pr 4128 df-tp 4130 df-op 4132 df-uni 4373 df-int 4411 df-br 4584 df-opab 4644 df-mpt 4645 df-tr 4681 df-eprel 4949 df-id 4953 df-po 4959 df-so 4960 df-fr 4997 df-we 4999 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-rn 5049 df-res 5050 df-ima 5051 df-ord 5643 df-on 5644 df-lim 5645 df-suc 5646 df-iota 5768 df-fun 5806 df-fn 5807 df-f 5808 df-f1 5809 df-fo 5810 df-f1o 5811 df-fv 5812 df-ov 6552 df-oprab 6553 df-mpt2 6554 df-om 6958 df-1o 7447 df-2o 7448 df-er 7629 df-en 7842 df-dom 7843 df-sdom 7844 df-fin 7845 df-card 8648 df-cda 8873 df-fin5 8994 df-fin6 8995 |
This theorem is referenced by: fin2so 32566 |
Copyright terms: Public domain | W3C validator |