Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
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 4429 | . . . . 5 ⊢ ((({∅} × 𝐴) ∪ ({1o} × 1o)) ∖ ({1o} × 1o)) = (({∅} × 𝐴) ∖ ({1o} × 1o)) | |
2 | df-dju 9330 | . . . . . 6 ⊢ (𝐴 ⊔ 1o) = (({∅} × 𝐴) ∪ ({1o} × 1o)) | |
3 | df1o2 8116 | . . . . . . . 8 ⊢ 1o = {∅} | |
4 | 3 | xpeq2i 5582 | . . . . . . 7 ⊢ ({1o} × 1o) = ({1o} × {∅}) |
5 | 1oex 8110 | . . . . . . . 8 ⊢ 1o ∈ V | |
6 | 0ex 5211 | . . . . . . . 8 ⊢ ∅ ∈ V | |
7 | 5, 6 | xpsn 6903 | . . . . . . 7 ⊢ ({1o} × {∅}) = {〈1o, ∅〉} |
8 | 4, 7 | eqtr2i 2845 | . . . . . 6 ⊢ {〈1o, ∅〉} = ({1o} × 1o) |
9 | 2, 8 | difeq12i 4097 | . . . . 5 ⊢ ((𝐴 ⊔ 1o) ∖ {〈1o, ∅〉}) = ((({∅} × 𝐴) ∪ ({1o} × 1o)) ∖ ({1o} × 1o)) |
10 | xp01disjl 8121 | . . . . . 6 ⊢ (({∅} × 𝐴) ∩ ({1o} × 1o)) = ∅ | |
11 | disj3 4403 | . . . . . 6 ⊢ ((({∅} × 𝐴) ∩ ({1o} × 1o)) = ∅ ↔ ({∅} × 𝐴) = (({∅} × 𝐴) ∖ ({1o} × 1o))) | |
12 | 10, 11 | mpbi 232 | . . . . 5 ⊢ ({∅} × 𝐴) = (({∅} × 𝐴) ∖ ({1o} × 1o)) |
13 | 1, 9, 12 | 3eqtr4i 2854 | . . . 4 ⊢ ((𝐴 ⊔ 1o) ∖ {〈1o, ∅〉}) = ({∅} × 𝐴) |
14 | reldom 8515 | . . . . . . . 8 ⊢ Rel ≼ | |
15 | 14 | brrelex2i 5609 | . . . . . . 7 ⊢ (ω ≼ 𝐴 → 𝐴 ∈ V) |
16 | 1on 8109 | . . . . . . 7 ⊢ 1o ∈ On | |
17 | djudoml 9610 | . . . . . . 7 ⊢ ((𝐴 ∈ V ∧ 1o ∈ On) → 𝐴 ≼ (𝐴 ⊔ 1o)) | |
18 | 15, 16, 17 | sylancl 588 | . . . . . 6 ⊢ (ω ≼ 𝐴 → 𝐴 ≼ (𝐴 ⊔ 1o)) |
19 | domtr 8562 | . . . . . 6 ⊢ ((ω ≼ 𝐴 ∧ 𝐴 ≼ (𝐴 ⊔ 1o)) → ω ≼ (𝐴 ⊔ 1o)) | |
20 | 18, 19 | mpdan 685 | . . . . 5 ⊢ (ω ≼ 𝐴 → ω ≼ (𝐴 ⊔ 1o)) |
21 | infdifsn 9120 | . . . . 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 5102 | . . 3 ⊢ (ω ≼ 𝐴 → ({∅} × 𝐴) ≈ (𝐴 ⊔ 1o)) |
24 | 23 | ensymd 8560 | . 2 ⊢ (ω ≼ 𝐴 → (𝐴 ⊔ 1o) ≈ ({∅} × 𝐴)) |
25 | xpsnen2g 8610 | . . 3 ⊢ ((∅ ∈ V ∧ 𝐴 ∈ V) → ({∅} × 𝐴) ≈ 𝐴) | |
26 | 6, 15, 25 | sylancr 589 | . 2 ⊢ (ω ≼ 𝐴 → ({∅} × 𝐴) ≈ 𝐴) |
27 | entr 8561 | . 2 ⊢ (((𝐴 ⊔ 1o) ≈ ({∅} × 𝐴) ∧ ({∅} × 𝐴) ≈ 𝐴) → (𝐴 ⊔ 1o) ≈ 𝐴) | |
28 | 24, 26, 27 | syl2anc 586 | 1 ⊢ (ω ≼ 𝐴 → (𝐴 ⊔ 1o) ≈ 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1537 ∈ wcel 2114 Vcvv 3494 ∖ cdif 3933 ∪ cun 3934 ∩ cin 3935 ∅c0 4291 {csn 4567 〈cop 4573 class class class wbr 5066 × cxp 5553 Oncon0 6191 ωcom 7580 1oc1o 8095 ≈ cen 8506 ≼ cdom 8507 ⊔ cdju 9327 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-sep 5203 ax-nul 5210 ax-pow 5266 ax-pr 5330 ax-un 7461 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-ral 3143 df-rex 3144 df-reu 3145 df-rab 3147 df-v 3496 df-sbc 3773 df-csb 3884 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-pss 3954 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4568 df-pr 4570 df-tp 4572 df-op 4574 df-uni 4839 df-int 4877 df-br 5067 df-opab 5129 df-mpt 5147 df-tr 5173 df-id 5460 df-eprel 5465 df-po 5474 df-so 5475 df-fr 5514 df-we 5516 df-xp 5561 df-rel 5562 df-cnv 5563 df-co 5564 df-dm 5565 df-rn 5566 df-res 5567 df-ima 5568 df-ord 6194 df-on 6195 df-lim 6196 df-suc 6197 df-iota 6314 df-fun 6357 df-fn 6358 df-f 6359 df-f1 6360 df-fo 6361 df-f1o 6362 df-fv 6363 df-om 7581 df-1st 7689 df-2nd 7690 df-1o 8102 df-er 8289 df-en 8510 df-dom 8511 df-dju 9330 |
This theorem is referenced by: pwdjuidm 9617 isfin4p1 9737 canthp1lem2 10075 |
Copyright terms: Public domain | W3C validator |