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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 9992 | . 2 ⊢ (𝐴 ⊔ 𝐵) = (({∅} × 𝐴) ∪ ({1o} × 𝐵)) | |
| 2 | 0ex 5263 | . . . . . 6 ⊢ ∅ ∈ V | |
| 3 | xpsnen2g 9100 | . . . . . 6 ⊢ ((∅ ∈ V ∧ 𝐴 ∈ 𝑉) → ({∅} × 𝐴) ≈ 𝐴) | |
| 4 | 2, 3 | mpan 703 | . . . . 5 ⊢ (𝐴 ∈ 𝑉 → ({∅} × 𝐴) ≈ 𝐴) |
| 5 | 1on 8500 | . . . . . 6 ⊢ 1o ∈ On | |
| 6 | xpsnen2g 9100 | . . . . . 6 ⊢ ((1o ∈ On ∧ 𝐵 ∈ 𝑊) → ({1o} × 𝐵) ≈ 𝐵) | |
| 7 | 5, 6 | mpan 703 | . . . . 5 ⊢ (𝐵 ∈ 𝑊 → ({1o} × 𝐵) ≈ 𝐵) |
| 8 | 4, 7 | anim12i 625 | . . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (({∅} × 𝐴) ≈ 𝐴 ∧ ({1o} × 𝐵) ≈ 𝐵)) |
| 9 | xp01disjl 8511 | . . . . 5 ⊢ (({∅} × 𝐴) ∩ ({1o} × 𝐵)) = ∅ | |
| 10 | 9 | jctl 533 | . . . 4 ⊢ ((𝐴 ∩ 𝐵) = ∅ → ((({∅} × 𝐴) ∩ ({1o} × 𝐵)) = ∅ ∧ (𝐴 ∩ 𝐵) = ∅)) |
| 11 | unen 9084 | . . . 4 ⊢ (((({∅} × 𝐴) ≈ 𝐴 ∧ ({1o} × 𝐵) ≈ 𝐵) ∧ ((({∅} × 𝐴) ∩ ({1o} × 𝐵)) = ∅ ∧ (𝐴 ∩ 𝐵) = ∅)) → (({∅} × 𝐴) ∪ ({1o} × 𝐵)) ≈ (𝐴 ∪ 𝐵)) | |
| 12 | 8, 10, 11 | syl2an 608 | . . 3 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) ∧ (𝐴 ∩ 𝐵) = ∅) → (({∅} × 𝐴) ∪ ({1o} × 𝐵)) ≈ (𝐴 ∪ 𝐵)) |
| 13 | 12 | 3impa 1127 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (({∅} × 𝐴) ∪ ({1o} × 𝐵)) ≈ (𝐴 ∪ 𝐵)) |
| 14 | 1, 13 | eqbrtrid 5142 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (𝐴 ⊔ 𝐵) ≈ (𝐴 ∪ 𝐵)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∧ w3a 1103 = wceq 1569 ∈ wcel 2146 Vcvv 3453 ∩ cin 4091 ∪ cun 4151 ∅c0 4280 {csn 4587 class class class wbr 5105 × cxp 5652 Oncon0 6368 1oc1o 8480 ≈ cen 8981 ⊔ cdju 9989 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1944 ax-6 2001 ax-7 2042 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2196 ax-12 2215 ax-ext 2735 ax-sep 5251 ax-nul 5262 ax-pow 5330 ax-pr 5394 ax-un 7758 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2101 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-ral 3080 df-rex 3090 df-rab 3416 df-v 3455 df-ss 3900 df-pss 4016 df-dif 4049 df-in 4093 df-un 4153 df-nul 4281 df-if 4485 df-pw 4561 df-sn 4588 df-pr 4590 df-op 4838 df-uni 4870 df-int 4910 df-br 5106 df-opab 5170 df-mpt 5189 df-tr 5215 df-id 5549 df-eprel 5554 df-po 5562 df-so 5563 df-fr 5607 df-we 5609 df-xp 5660 df-rel 5661 df-cnv 5662 df-co 5663 df-dm 5664 df-rn 5665 df-res 5666 df-ima 5667 df-ord 6371 df-on 6372 df-suc 6374 df-iota 6500 df-fun 6548 df-fn 6549 df-f 6550 df-f1 6551 df-fo 6552 df-f1o 6553 df-fv 6554 df-1st 8008 df-2nd 8009 df-1o 8487 df-er 8728 df-en 8985 df-dju 9992 |
| This theorem is used by: djuenun 10259 dju0en 10264 ficardun 10289 ackbij1lem9 10315 canthp1lem1 10747 |
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