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Theorem djuassen 7194
Description: Associative law for cardinal addition. Exercise 4.56(c) of [Mendelson] p. 258. (Contributed by NM, 26-Sep-2004.) (Revised by Mario Carneiro, 29-Apr-2015.)
Assertion
Ref Expression
djuassen ((𝐴𝑉𝐵𝑊𝐶𝑋) → ((𝐴𝐵) ⊔ 𝐶) ≈ (𝐴 ⊔ (𝐵𝐶)))

Proof of Theorem djuassen
StepHypRef Expression
1 0ex 4116 . . . . . 6 ∅ ∈ V
2 simp1 992 . . . . . 6 ((𝐴𝑉𝐵𝑊𝐶𝑋) → 𝐴𝑉)
3 xpsnen2g 6807 . . . . . 6 ((∅ ∈ V ∧ 𝐴𝑉) → ({∅} × 𝐴) ≈ 𝐴)
41, 2, 3sylancr 412 . . . . 5 ((𝐴𝑉𝐵𝑊𝐶𝑋) → ({∅} × 𝐴) ≈ 𝐴)
54ensymd 6761 . . . 4 ((𝐴𝑉𝐵𝑊𝐶𝑋) → 𝐴 ≈ ({∅} × 𝐴))
6 1oex 6403 . . . . . . 7 1o ∈ V
71snex 4171 . . . . . . . 8 {∅} ∈ V
8 simp2 993 . . . . . . . 8 ((𝐴𝑉𝐵𝑊𝐶𝑋) → 𝐵𝑊)
9 xpexg 4725 . . . . . . . 8 (({∅} ∈ V ∧ 𝐵𝑊) → ({∅} × 𝐵) ∈ V)
107, 8, 9sylancr 412 . . . . . . 7 ((𝐴𝑉𝐵𝑊𝐶𝑋) → ({∅} × 𝐵) ∈ V)
11 xpsnen2g 6807 . . . . . . 7 ((1o ∈ V ∧ ({∅} × 𝐵) ∈ V) → ({1o} × ({∅} × 𝐵)) ≈ ({∅} × 𝐵))
126, 10, 11sylancr 412 . . . . . 6 ((𝐴𝑉𝐵𝑊𝐶𝑋) → ({1o} × ({∅} × 𝐵)) ≈ ({∅} × 𝐵))
13 xpsnen2g 6807 . . . . . . 7 ((∅ ∈ V ∧ 𝐵𝑊) → ({∅} × 𝐵) ≈ 𝐵)
141, 8, 13sylancr 412 . . . . . 6 ((𝐴𝑉𝐵𝑊𝐶𝑋) → ({∅} × 𝐵) ≈ 𝐵)
15 entr 6762 . . . . . 6 ((({1o} × ({∅} × 𝐵)) ≈ ({∅} × 𝐵) ∧ ({∅} × 𝐵) ≈ 𝐵) → ({1o} × ({∅} × 𝐵)) ≈ 𝐵)
1612, 14, 15syl2anc 409 . . . . 5 ((𝐴𝑉𝐵𝑊𝐶𝑋) → ({1o} × ({∅} × 𝐵)) ≈ 𝐵)
1716ensymd 6761 . . . 4 ((𝐴𝑉𝐵𝑊𝐶𝑋) → 𝐵 ≈ ({1o} × ({∅} × 𝐵)))
18 xp01disjl 6413 . . . . 5 (({∅} × 𝐴) ∩ ({1o} × ({∅} × 𝐵))) = ∅
1918a1i 9 . . . 4 ((𝐴𝑉𝐵𝑊𝐶𝑋) → (({∅} × 𝐴) ∩ ({1o} × ({∅} × 𝐵))) = ∅)
20 djuenun 7189 . . . 4 ((𝐴 ≈ ({∅} × 𝐴) ∧ 𝐵 ≈ ({1o} × ({∅} × 𝐵)) ∧ (({∅} × 𝐴) ∩ ({1o} × ({∅} × 𝐵))) = ∅) → (𝐴𝐵) ≈ (({∅} × 𝐴) ∪ ({1o} × ({∅} × 𝐵))))
215, 17, 19, 20syl3anc 1233 . . 3 ((𝐴𝑉𝐵𝑊𝐶𝑋) → (𝐴𝐵) ≈ (({∅} × 𝐴) ∪ ({1o} × ({∅} × 𝐵))))
226snex 4171 . . . . . . 7 {1o} ∈ V
23 simp3 994 . . . . . . 7 ((𝐴𝑉𝐵𝑊𝐶𝑋) → 𝐶𝑋)
24 xpexg 4725 . . . . . . 7 (({1o} ∈ V ∧ 𝐶𝑋) → ({1o} × 𝐶) ∈ V)
2522, 23, 24sylancr 412 . . . . . 6 ((𝐴𝑉𝐵𝑊𝐶𝑋) → ({1o} × 𝐶) ∈ V)
26 xpsnen2g 6807 . . . . . 6 ((1o ∈ V ∧ ({1o} × 𝐶) ∈ V) → ({1o} × ({1o} × 𝐶)) ≈ ({1o} × 𝐶))
276, 25, 26sylancr 412 . . . . 5 ((𝐴𝑉𝐵𝑊𝐶𝑋) → ({1o} × ({1o} × 𝐶)) ≈ ({1o} × 𝐶))
28 xpsnen2g 6807 . . . . . 6 ((1o ∈ V ∧ 𝐶𝑋) → ({1o} × 𝐶) ≈ 𝐶)
296, 23, 28sylancr 412 . . . . 5 ((𝐴𝑉𝐵𝑊𝐶𝑋) → ({1o} × 𝐶) ≈ 𝐶)
30 entr 6762 . . . . 5 ((({1o} × ({1o} × 𝐶)) ≈ ({1o} × 𝐶) ∧ ({1o} × 𝐶) ≈ 𝐶) → ({1o} × ({1o} × 𝐶)) ≈ 𝐶)
3127, 29, 30syl2anc 409 . . . 4 ((𝐴𝑉𝐵𝑊𝐶𝑋) → ({1o} × ({1o} × 𝐶)) ≈ 𝐶)
3231ensymd 6761 . . 3 ((𝐴𝑉𝐵𝑊𝐶𝑋) → 𝐶 ≈ ({1o} × ({1o} × 𝐶)))
33 indir 3376 . . . . 5 ((({∅} × 𝐴) ∪ ({1o} × ({∅} × 𝐵))) ∩ ({1o} × ({1o} × 𝐶))) = ((({∅} × 𝐴) ∩ ({1o} × ({1o} × 𝐶))) ∪ (({1o} × ({∅} × 𝐵)) ∩ ({1o} × ({1o} × 𝐶))))
34 xp01disjl 6413 . . . . . . 7 (({∅} × 𝐴) ∩ ({1o} × ({1o} × 𝐶))) = ∅
35 xp01disjl 6413 . . . . . . . . 9 (({∅} × 𝐵) ∩ ({1o} × 𝐶)) = ∅
3635xpeq2i 4632 . . . . . . . 8 ({1o} × (({∅} × 𝐵) ∩ ({1o} × 𝐶))) = ({1o} × ∅)
37 xpindi 4746 . . . . . . . 8 ({1o} × (({∅} × 𝐵) ∩ ({1o} × 𝐶))) = (({1o} × ({∅} × 𝐵)) ∩ ({1o} × ({1o} × 𝐶)))
38 xp0 5030 . . . . . . . 8 ({1o} × ∅) = ∅
3936, 37, 383eqtr3i 2199 . . . . . . 7 (({1o} × ({∅} × 𝐵)) ∩ ({1o} × ({1o} × 𝐶))) = ∅
4034, 39uneq12i 3279 . . . . . 6 ((({∅} × 𝐴) ∩ ({1o} × ({1o} × 𝐶))) ∪ (({1o} × ({∅} × 𝐵)) ∩ ({1o} × ({1o} × 𝐶)))) = (∅ ∪ ∅)
41 un0 3448 . . . . . 6 (∅ ∪ ∅) = ∅
4240, 41eqtri 2191 . . . . 5 ((({∅} × 𝐴) ∩ ({1o} × ({1o} × 𝐶))) ∪ (({1o} × ({∅} × 𝐵)) ∩ ({1o} × ({1o} × 𝐶)))) = ∅
4333, 42eqtri 2191 . . . 4 ((({∅} × 𝐴) ∪ ({1o} × ({∅} × 𝐵))) ∩ ({1o} × ({1o} × 𝐶))) = ∅
4443a1i 9 . . 3 ((𝐴𝑉𝐵𝑊𝐶𝑋) → ((({∅} × 𝐴) ∪ ({1o} × ({∅} × 𝐵))) ∩ ({1o} × ({1o} × 𝐶))) = ∅)
45 djuenun 7189 . . 3 (((𝐴𝐵) ≈ (({∅} × 𝐴) ∪ ({1o} × ({∅} × 𝐵))) ∧ 𝐶 ≈ ({1o} × ({1o} × 𝐶)) ∧ ((({∅} × 𝐴) ∪ ({1o} × ({∅} × 𝐵))) ∩ ({1o} × ({1o} × 𝐶))) = ∅) → ((𝐴𝐵) ⊔ 𝐶) ≈ ((({∅} × 𝐴) ∪ ({1o} × ({∅} × 𝐵))) ∪ ({1o} × ({1o} × 𝐶))))
4621, 32, 44, 45syl3anc 1233 . 2 ((𝐴𝑉𝐵𝑊𝐶𝑋) → ((𝐴𝐵) ⊔ 𝐶) ≈ ((({∅} × 𝐴) ∪ ({1o} × ({∅} × 𝐵))) ∪ ({1o} × ({1o} × 𝐶))))
47 df-dju 7015 . . . . . 6 (𝐵𝐶) = (({∅} × 𝐵) ∪ ({1o} × 𝐶))
4847xpeq2i 4632 . . . . 5 ({1o} × (𝐵𝐶)) = ({1o} × (({∅} × 𝐵) ∪ ({1o} × 𝐶)))
49 xpundi 4667 . . . . 5 ({1o} × (({∅} × 𝐵) ∪ ({1o} × 𝐶))) = (({1o} × ({∅} × 𝐵)) ∪ ({1o} × ({1o} × 𝐶)))
5048, 49eqtri 2191 . . . 4 ({1o} × (𝐵𝐶)) = (({1o} × ({∅} × 𝐵)) ∪ ({1o} × ({1o} × 𝐶)))
5150uneq2i 3278 . . 3 (({∅} × 𝐴) ∪ ({1o} × (𝐵𝐶))) = (({∅} × 𝐴) ∪ (({1o} × ({∅} × 𝐵)) ∪ ({1o} × ({1o} × 𝐶))))
52 df-dju 7015 . . 3 (𝐴 ⊔ (𝐵𝐶)) = (({∅} × 𝐴) ∪ ({1o} × (𝐵𝐶)))
53 unass 3284 . . 3 ((({∅} × 𝐴) ∪ ({1o} × ({∅} × 𝐵))) ∪ ({1o} × ({1o} × 𝐶))) = (({∅} × 𝐴) ∪ (({1o} × ({∅} × 𝐵)) ∪ ({1o} × ({1o} × 𝐶))))
5451, 52, 533eqtr4i 2201 . 2 (𝐴 ⊔ (𝐵𝐶)) = ((({∅} × 𝐴) ∪ ({1o} × ({∅} × 𝐵))) ∪ ({1o} × ({1o} × 𝐶)))
5546, 54breqtrrdi 4031 1 ((𝐴𝑉𝐵𝑊𝐶𝑋) → ((𝐴𝐵) ⊔ 𝐶) ≈ (𝐴 ⊔ (𝐵𝐶)))
Colors of variables: wff set class
Syntax hints:  wi 4  w3a 973   = wceq 1348  wcel 2141  Vcvv 2730  cun 3119  cin 3120  c0 3414  {csn 3583   class class class wbr 3989   × cxp 4609  1oc1o 6388  cen 6716  cdju 7014
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 609  ax-in2 610  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-13 2143  ax-14 2144  ax-ext 2152  ax-coll 4104  ax-sep 4107  ax-nul 4115  ax-pow 4160  ax-pr 4194  ax-un 4418
This theorem depends on definitions:  df-bi 116  df-3an 975  df-tru 1351  df-fal 1354  df-nf 1454  df-sb 1756  df-eu 2022  df-mo 2023  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ne 2341  df-ral 2453  df-rex 2454  df-reu 2455  df-rab 2457  df-v 2732  df-sbc 2956  df-csb 3050  df-dif 3123  df-un 3125  df-in 3127  df-ss 3134  df-nul 3415  df-pw 3568  df-sn 3589  df-pr 3590  df-op 3592  df-uni 3797  df-int 3832  df-iun 3875  df-br 3990  df-opab 4051  df-mpt 4052  df-tr 4088  df-id 4278  df-iord 4351  df-on 4353  df-suc 4356  df-xp 4617  df-rel 4618  df-cnv 4619  df-co 4620  df-dm 4621  df-rn 4622  df-res 4623  df-ima 4624  df-iota 5160  df-fun 5200  df-fn 5201  df-f 5202  df-f1 5203  df-fo 5204  df-f1o 5205  df-fv 5206  df-1st 6119  df-2nd 6120  df-1o 6395  df-er 6513  df-en 6719  df-dju 7015  df-inl 7024  df-inr 7025
This theorem is referenced by: (None)
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