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Mirrors > Home > ILE Home > Th. List > dju1p1e2 | GIF version |
Description: Disjoint union version of one plus one equals two. (Contributed by Jim Kingdon, 1-Jul-2022.) |
Ref | Expression |
---|---|
dju1p1e2 | ⊢ (1o ⊔ 1o) ≈ 2o |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | djuun 7023 | . 2 ⊢ ((inl “ 1o) ∪ (inr “ 1o)) = (1o ⊔ 1o) | |
2 | djuin 7020 | . . 3 ⊢ ((inl “ 1o) ∩ (inr “ 1o)) = ∅ | |
3 | djulf1o 7014 | . . . . . . . 8 ⊢ inl:V–1-1-onto→({∅} × V) | |
4 | f1of1 5425 | . . . . . . . 8 ⊢ (inl:V–1-1-onto→({∅} × V) → inl:V–1-1→({∅} × V)) | |
5 | 3, 4 | ax-mp 5 | . . . . . . 7 ⊢ inl:V–1-1→({∅} × V) |
6 | ssv 3159 | . . . . . . 7 ⊢ 1o ⊆ V | |
7 | f1ores 5441 | . . . . . . 7 ⊢ ((inl:V–1-1→({∅} × V) ∧ 1o ⊆ V) → (inl ↾ 1o):1o–1-1-onto→(inl “ 1o)) | |
8 | 5, 6, 7 | mp2an 423 | . . . . . 6 ⊢ (inl ↾ 1o):1o–1-1-onto→(inl “ 1o) |
9 | 1oex 6383 | . . . . . . 7 ⊢ 1o ∈ V | |
10 | 9 | f1oen 6716 | . . . . . 6 ⊢ ((inl ↾ 1o):1o–1-1-onto→(inl “ 1o) → 1o ≈ (inl “ 1o)) |
11 | 8, 10 | ax-mp 5 | . . . . 5 ⊢ 1o ≈ (inl “ 1o) |
12 | 11 | ensymi 6739 | . . . 4 ⊢ (inl “ 1o) ≈ 1o |
13 | djurf1o 7015 | . . . . . . . 8 ⊢ inr:V–1-1-onto→({1o} × V) | |
14 | f1of1 5425 | . . . . . . . 8 ⊢ (inr:V–1-1-onto→({1o} × V) → inr:V–1-1→({1o} × V)) | |
15 | 13, 14 | ax-mp 5 | . . . . . . 7 ⊢ inr:V–1-1→({1o} × V) |
16 | f1ores 5441 | . . . . . . 7 ⊢ ((inr:V–1-1→({1o} × V) ∧ 1o ⊆ V) → (inr ↾ 1o):1o–1-1-onto→(inr “ 1o)) | |
17 | 15, 6, 16 | mp2an 423 | . . . . . 6 ⊢ (inr ↾ 1o):1o–1-1-onto→(inr “ 1o) |
18 | 9 | f1oen 6716 | . . . . . 6 ⊢ ((inr ↾ 1o):1o–1-1-onto→(inr “ 1o) → 1o ≈ (inr “ 1o)) |
19 | 17, 18 | ax-mp 5 | . . . . 5 ⊢ 1o ≈ (inr “ 1o) |
20 | 19 | ensymi 6739 | . . . 4 ⊢ (inr “ 1o) ≈ 1o |
21 | pm54.43 7137 | . . . 4 ⊢ (((inl “ 1o) ≈ 1o ∧ (inr “ 1o) ≈ 1o) → (((inl “ 1o) ∩ (inr “ 1o)) = ∅ ↔ ((inl “ 1o) ∪ (inr “ 1o)) ≈ 2o)) | |
22 | 12, 20, 21 | mp2an 423 | . . 3 ⊢ (((inl “ 1o) ∩ (inr “ 1o)) = ∅ ↔ ((inl “ 1o) ∪ (inr “ 1o)) ≈ 2o) |
23 | 2, 22 | mpbi 144 | . 2 ⊢ ((inl “ 1o) ∪ (inr “ 1o)) ≈ 2o |
24 | 1, 23 | eqbrtrri 3999 | 1 ⊢ (1o ⊔ 1o) ≈ 2o |
Colors of variables: wff set class |
Syntax hints: ↔ wb 104 = wceq 1342 Vcvv 2721 ∪ cun 3109 ∩ cin 3110 ⊆ wss 3111 ∅c0 3404 {csn 3570 class class class wbr 3976 × cxp 4596 ↾ cres 4600 “ cima 4601 –1-1→wf1 5179 –1-1-onto→wf1o 5181 1oc1o 6368 2oc2o 6369 ≈ cen 6695 ⊔ cdju 6993 inlcinl 7001 inrcinr 7002 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-10 1492 ax-11 1493 ax-i12 1494 ax-bndl 1496 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-13 2137 ax-14 2138 ax-ext 2146 ax-coll 4091 ax-sep 4094 ax-nul 4102 ax-pow 4147 ax-pr 4181 ax-un 4405 ax-setind 4508 ax-iinf 4559 |
This theorem depends on definitions: df-bi 116 df-dc 825 df-3or 968 df-3an 969 df-tru 1345 df-fal 1348 df-nf 1448 df-sb 1750 df-eu 2016 df-mo 2017 df-clab 2151 df-cleq 2157 df-clel 2160 df-nfc 2295 df-ne 2335 df-ral 2447 df-rex 2448 df-reu 2449 df-rab 2451 df-v 2723 df-sbc 2947 df-csb 3041 df-dif 3113 df-un 3115 df-in 3117 df-ss 3124 df-nul 3405 df-pw 3555 df-sn 3576 df-pr 3577 df-op 3579 df-uni 3784 df-int 3819 df-iun 3862 df-br 3977 df-opab 4038 df-mpt 4039 df-tr 4075 df-id 4265 df-iord 4338 df-on 4340 df-suc 4343 df-iom 4562 df-xp 4604 df-rel 4605 df-cnv 4606 df-co 4607 df-dm 4608 df-rn 4609 df-res 4610 df-ima 4611 df-iota 5147 df-fun 5184 df-fn 5185 df-f 5186 df-f1 5187 df-fo 5188 df-f1o 5189 df-fv 5190 df-1st 6100 df-2nd 6101 df-1o 6375 df-2o 6376 df-er 6492 df-en 6698 df-dju 6994 df-inl 7003 df-inr 7004 |
This theorem is referenced by: exmidfodomrlemr 7149 exmidfodomrlemrALT 7150 |
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