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Mirrors > Home > MPE Home > Th. List > infdju1 | Structured version Visualization version GIF version |
Description: An infinite set is equinumerous to itself added with one. (Contributed by Mario Carneiro, 15-May-2015.) |
Ref | Expression |
---|---|
infdju1 | ⊢ (ω ≼ 𝐴 → (𝐴 ⊔ 1o) ≈ 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | difun2 4380 | . . . . 5 ⊢ ((({∅} × 𝐴) ∪ ({1o} × 1o)) ∖ ({1o} × 1o)) = (({∅} × 𝐴) ∖ ({1o} × 1o)) | |
2 | df-dju 9376 | . . . . . 6 ⊢ (𝐴 ⊔ 1o) = (({∅} × 𝐴) ∪ ({1o} × 1o)) | |
3 | df1o2 8132 | . . . . . . . 8 ⊢ 1o = {∅} | |
4 | 3 | xpeq2i 5555 | . . . . . . 7 ⊢ ({1o} × 1o) = ({1o} × {∅}) |
5 | 1oex 8126 | . . . . . . . 8 ⊢ 1o ∈ V | |
6 | 0ex 5181 | . . . . . . . 8 ⊢ ∅ ∈ V | |
7 | 5, 6 | xpsn 6900 | . . . . . . 7 ⊢ ({1o} × {∅}) = {〈1o, ∅〉} |
8 | 4, 7 | eqtr2i 2782 | . . . . . 6 ⊢ {〈1o, ∅〉} = ({1o} × 1o) |
9 | 2, 8 | difeq12i 4028 | . . . . 5 ⊢ ((𝐴 ⊔ 1o) ∖ {〈1o, ∅〉}) = ((({∅} × 𝐴) ∪ ({1o} × 1o)) ∖ ({1o} × 1o)) |
10 | xp01disjl 8137 | . . . . . 6 ⊢ (({∅} × 𝐴) ∩ ({1o} × 1o)) = ∅ | |
11 | disj3 4353 | . . . . . 6 ⊢ ((({∅} × 𝐴) ∩ ({1o} × 1o)) = ∅ ↔ ({∅} × 𝐴) = (({∅} × 𝐴) ∖ ({1o} × 1o))) | |
12 | 10, 11 | mpbi 233 | . . . . 5 ⊢ ({∅} × 𝐴) = (({∅} × 𝐴) ∖ ({1o} × 1o)) |
13 | 1, 9, 12 | 3eqtr4i 2791 | . . . 4 ⊢ ((𝐴 ⊔ 1o) ∖ {〈1o, ∅〉}) = ({∅} × 𝐴) |
14 | reldom 8546 | . . . . . . . 8 ⊢ Rel ≼ | |
15 | 14 | brrelex2i 5583 | . . . . . . 7 ⊢ (ω ≼ 𝐴 → 𝐴 ∈ V) |
16 | 1on 8125 | . . . . . . 7 ⊢ 1o ∈ On | |
17 | djudoml 9657 | . . . . . . 7 ⊢ ((𝐴 ∈ V ∧ 1o ∈ On) → 𝐴 ≼ (𝐴 ⊔ 1o)) | |
18 | 15, 16, 17 | sylancl 589 | . . . . . 6 ⊢ (ω ≼ 𝐴 → 𝐴 ≼ (𝐴 ⊔ 1o)) |
19 | domtr 8593 | . . . . . 6 ⊢ ((ω ≼ 𝐴 ∧ 𝐴 ≼ (𝐴 ⊔ 1o)) → ω ≼ (𝐴 ⊔ 1o)) | |
20 | 18, 19 | mpdan 686 | . . . . 5 ⊢ (ω ≼ 𝐴 → ω ≼ (𝐴 ⊔ 1o)) |
21 | infdifsn 9166 | . . . . 5 ⊢ (ω ≼ (𝐴 ⊔ 1o) → ((𝐴 ⊔ 1o) ∖ {〈1o, ∅〉}) ≈ (𝐴 ⊔ 1o)) | |
22 | 20, 21 | syl 17 | . . . 4 ⊢ (ω ≼ 𝐴 → ((𝐴 ⊔ 1o) ∖ {〈1o, ∅〉}) ≈ (𝐴 ⊔ 1o)) |
23 | 13, 22 | eqbrtrrid 5072 | . . 3 ⊢ (ω ≼ 𝐴 → ({∅} × 𝐴) ≈ (𝐴 ⊔ 1o)) |
24 | 23 | ensymd 8591 | . 2 ⊢ (ω ≼ 𝐴 → (𝐴 ⊔ 1o) ≈ ({∅} × 𝐴)) |
25 | xpsnen2g 8644 | . . 3 ⊢ ((∅ ∈ V ∧ 𝐴 ∈ V) → ({∅} × 𝐴) ≈ 𝐴) | |
26 | 6, 15, 25 | sylancr 590 | . 2 ⊢ (ω ≼ 𝐴 → ({∅} × 𝐴) ≈ 𝐴) |
27 | entr 8592 | . 2 ⊢ (((𝐴 ⊔ 1o) ≈ ({∅} × 𝐴) ∧ ({∅} × 𝐴) ≈ 𝐴) → (𝐴 ⊔ 1o) ≈ 𝐴) | |
28 | 24, 26, 27 | syl2anc 587 | 1 ⊢ (ω ≼ 𝐴 → (𝐴 ⊔ 1o) ≈ 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1538 ∈ wcel 2111 Vcvv 3409 ∖ cdif 3857 ∪ cun 3858 ∩ cin 3859 ∅c0 4227 {csn 4525 〈cop 4531 class class class wbr 5036 × cxp 5526 Oncon0 6174 ωcom 7585 1oc1o 8111 ≈ cen 8537 ≼ cdom 8538 ⊔ cdju 9373 |
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 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2729 ax-sep 5173 ax-nul 5180 ax-pow 5238 ax-pr 5302 ax-un 7465 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3or 1085 df-3an 1086 df-tru 1541 df-fal 1551 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2557 df-eu 2588 df-clab 2736 df-cleq 2750 df-clel 2830 df-nfc 2901 df-ne 2952 df-ral 3075 df-rex 3076 df-reu 3077 df-rab 3079 df-v 3411 df-sbc 3699 df-csb 3808 df-dif 3863 df-un 3865 df-in 3867 df-ss 3877 df-pss 3879 df-nul 4228 df-if 4424 df-pw 4499 df-sn 4526 df-pr 4528 df-tp 4530 df-op 4532 df-uni 4802 df-int 4842 df-br 5037 df-opab 5099 df-mpt 5117 df-tr 5143 df-id 5434 df-eprel 5439 df-po 5447 df-so 5448 df-fr 5487 df-we 5489 df-xp 5534 df-rel 5535 df-cnv 5536 df-co 5537 df-dm 5538 df-rn 5539 df-res 5540 df-ima 5541 df-ord 6177 df-on 6178 df-lim 6179 df-suc 6180 df-iota 6299 df-fun 6342 df-fn 6343 df-f 6344 df-f1 6345 df-fo 6346 df-f1o 6347 df-fv 6348 df-om 7586 df-1st 7699 df-2nd 7700 df-1o 8118 df-er 8305 df-en 8541 df-dom 8542 df-dju 9376 |
This theorem is referenced by: pwdjuidm 9664 isfin4p1 9788 canthp1lem2 10126 |
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