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| Mirrors > Home > MPE Home > Th. List > endjudisj | Structured version Visualization version GIF version | ||
| Description: Equinumerosity of a disjoint union and a union of two disjoint sets. (Contributed by NM, 5-Apr-2007.) |
| Ref | Expression |
|---|---|
| endjudisj | ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (𝐴 ⊔ 𝐵) ≈ (𝐴 ∪ 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-dju 9886 | . 2 ⊢ (𝐴 ⊔ 𝐵) = (({∅} × 𝐴) ∪ ({1o} × 𝐵)) | |
| 2 | 0ex 5272 | . . . . . 6 ⊢ ∅ ∈ V | |
| 3 | xpsnen2g 9057 | . . . . . 6 ⊢ ((∅ ∈ V ∧ 𝐴 ∈ 𝑉) → ({∅} × 𝐴) ≈ 𝐴) | |
| 4 | 2, 3 | mpan 702 | . . . . 5 ⊢ (𝐴 ∈ 𝑉 → ({∅} × 𝐴) ≈ 𝐴) |
| 5 | 1on 8465 | . . . . . 6 ⊢ 1o ∈ On | |
| 6 | xpsnen2g 9057 | . . . . . 6 ⊢ ((1o ∈ On ∧ 𝐵 ∈ 𝑊) → ({1o} × 𝐵) ≈ 𝐵) | |
| 7 | 5, 6 | mpan 702 | . . . . 5 ⊢ (𝐵 ∈ 𝑊 → ({1o} × 𝐵) ≈ 𝐵) |
| 8 | 4, 7 | anim12i 624 | . . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (({∅} × 𝐴) ≈ 𝐴 ∧ ({1o} × 𝐵) ≈ 𝐵)) |
| 9 | xp01disjl 8476 | . . . . 5 ⊢ (({∅} × 𝐴) ∩ ({1o} × 𝐵)) = ∅ | |
| 10 | 9 | jctl 532 | . . . 4 ⊢ ((𝐴 ∩ 𝐵) = ∅ → ((({∅} × 𝐴) ∩ ({1o} × 𝐵)) = ∅ ∧ (𝐴 ∩ 𝐵) = ∅)) |
| 11 | unen 9041 | . . . 4 ⊢ (((({∅} × 𝐴) ≈ 𝐴 ∧ ({1o} × 𝐵) ≈ 𝐵) ∧ ((({∅} × 𝐴) ∩ ({1o} × 𝐵)) = ∅ ∧ (𝐴 ∩ 𝐵) = ∅)) → (({∅} × 𝐴) ∪ ({1o} × 𝐵)) ≈ (𝐴 ∪ 𝐵)) | |
| 12 | 8, 10, 11 | syl2an 607 | . . 3 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) ∧ (𝐴 ∩ 𝐵) = ∅) → (({∅} × 𝐴) ∪ ({1o} × 𝐵)) ≈ (𝐴 ∪ 𝐵)) |
| 13 | 12 | 3impa 1125 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (({∅} × 𝐴) ∪ ({1o} × 𝐵)) ≈ (𝐴 ∪ 𝐵)) |
| 14 | 1, 13 | eqbrtrid 5150 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (𝐴 ⊔ 𝐵) ≈ (𝐴 ∪ 𝐵)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 400 ∧ w3a 1101 = wceq 1567 ∈ wcel 2149 Vcvv 3463 ∪ cun 3911 ∩ cin 3912 ∅c0 4294 {csn 4594 class class class wbr 5113 × cxp 5660 Oncon0 6361 1oc1o 8445 ≈ cen 8939 ⊔ cdju 9883 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-10 2182 ax-11 2198 ax-12 2219 ax-ext 2741 ax-sep 5261 ax-nul 5271 ax-pow 5337 ax-pr 5405 ax-un 7733 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-nf 1811 df-sb 2098 df-mo 2573 df-eu 2603 df-clab 2748 df-cleq 2761 df-clel 2844 df-nfc 2918 df-ne 2965 df-ral 3086 df-rex 3096 df-rab 3424 df-v 3465 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-pss 3933 df-nul 4295 df-if 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4877 df-int 4917 df-br 5114 df-opab 5178 df-mpt 5197 df-tr 5223 df-id 5557 df-eprel 5562 df-po 5570 df-so 5571 df-fr 5615 df-we 5617 df-xp 5668 df-rel 5669 df-cnv 5670 df-co 5671 df-dm 5672 df-rn 5673 df-res 5674 df-ima 5675 df-ord 6364 df-on 6365 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-1st 7985 df-2nd 7986 df-1o 8452 df-er 8693 df-en 8943 df-dju 9886 |
| This theorem is referenced by: djuenun 10153 dju0en 10158 ficardun 10183 ackbij1lem9 10209 canthp1lem1 10636 |
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