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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 9982 | . 2 ⊢ (𝐴 ⊔ 𝐵) = (({∅} × 𝐴) ∪ ({1o} × 𝐵)) | |
| 2 | 0ex 5261 | . . . . . 6 ⊢ ∅ ∈ V | |
| 3 | xpsnen2g 9089 | . . . . . 6 ⊢ ((∅ ∈ V ∧ 𝐴 ∈ 𝑉) → ({∅} × 𝐴) ≈ 𝐴) | |
| 4 | 2, 3 | mpan 703 | . . . . 5 ⊢ (𝐴 ∈ 𝑉 → ({∅} × 𝐴) ≈ 𝐴) |
| 5 | 1on 8489 | . . . . . 6 ⊢ 1o ∈ On | |
| 6 | xpsnen2g 9089 | . . . . . 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 8500 | . . . . 5 ⊢ (({∅} × 𝐴) ∩ ({1o} × 𝐵)) = ∅ | |
| 10 | 9 | jctl 533 | . . . 4 ⊢ ((𝐴 ∩ 𝐵) = ∅ → ((({∅} × 𝐴) ∩ ({1o} × 𝐵)) = ∅ ∧ (𝐴 ∩ 𝐵) = ∅)) |
| 11 | unen 9073 | . . . 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 5140 | 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 1570 ∈ wcel 2145 Vcvv 3451 ∪ cun 3897 ∩ cin 3898 ∅c0 4279 {csn 4584 class class class wbr 5103 × cxp 5649 Oncon0 6362 1oc1o 8469 ≈ cen 8970 ⊔ cdju 9979 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2733 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7751 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-ral 3078 df-rex 3088 df-rab 3414 df-v 3453 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-int 4908 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-ord 6365 df-on 6366 df-suc 6368 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-1st 8001 df-2nd 8002 df-1o 8476 df-er 8717 df-en 8974 df-dju 9982 |
| This theorem is used by: djuenun 10249 dju0en 10254 ficardun 10279 ackbij1lem9 10305 canthp1lem1 10737 |
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