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Theorem djuassen 7037
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 4023 . . . . . 6 ∅ ∈ V
2 simp1 964 . . . . . 6 ((𝐴𝑉𝐵𝑊𝐶𝑋) → 𝐴𝑉)
3 xpsnen2g 6689 . . . . . 6 ((∅ ∈ V ∧ 𝐴𝑉) → ({∅} × 𝐴) ≈ 𝐴)
41, 2, 3sylancr 408 . . . . 5 ((𝐴𝑉𝐵𝑊𝐶𝑋) → ({∅} × 𝐴) ≈ 𝐴)
54ensymd 6643 . . . 4 ((𝐴𝑉𝐵𝑊𝐶𝑋) → 𝐴 ≈ ({∅} × 𝐴))
6 1oex 6287 . . . . . . 7 1o ∈ V
71snex 4077 . . . . . . . 8 {∅} ∈ V
8 simp2 965 . . . . . . . 8 ((𝐴𝑉𝐵𝑊𝐶𝑋) → 𝐵𝑊)
9 xpexg 4621 . . . . . . . 8 (({∅} ∈ V ∧ 𝐵𝑊) → ({∅} × 𝐵) ∈ V)
107, 8, 9sylancr 408 . . . . . . 7 ((𝐴𝑉𝐵𝑊𝐶𝑋) → ({∅} × 𝐵) ∈ V)
11 xpsnen2g 6689 . . . . . . 7 ((1o ∈ V ∧ ({∅} × 𝐵) ∈ V) → ({1o} × ({∅} × 𝐵)) ≈ ({∅} × 𝐵))
126, 10, 11sylancr 408 . . . . . 6 ((𝐴𝑉𝐵𝑊𝐶𝑋) → ({1o} × ({∅} × 𝐵)) ≈ ({∅} × 𝐵))
13 xpsnen2g 6689 . . . . . . 7 ((∅ ∈ V ∧ 𝐵𝑊) → ({∅} × 𝐵) ≈ 𝐵)
141, 8, 13sylancr 408 . . . . . 6 ((𝐴𝑉𝐵𝑊𝐶𝑋) → ({∅} × 𝐵) ≈ 𝐵)
15 entr 6644 . . . . . 6 ((({1o} × ({∅} × 𝐵)) ≈ ({∅} × 𝐵) ∧ ({∅} × 𝐵) ≈ 𝐵) → ({1o} × ({∅} × 𝐵)) ≈ 𝐵)
1612, 14, 15syl2anc 406 . . . . 5 ((𝐴𝑉𝐵𝑊𝐶𝑋) → ({1o} × ({∅} × 𝐵)) ≈ 𝐵)
1716ensymd 6643 . . . 4 ((𝐴𝑉𝐵𝑊𝐶𝑋) → 𝐵 ≈ ({1o} × ({∅} × 𝐵)))
18 xp01disjl 6297 . . . . 5 (({∅} × 𝐴) ∩ ({1o} × ({∅} × 𝐵))) = ∅
1918a1i 9 . . . 4 ((𝐴𝑉𝐵𝑊𝐶𝑋) → (({∅} × 𝐴) ∩ ({1o} × ({∅} × 𝐵))) = ∅)
20 djuenun 7032 . . . 4 ((𝐴 ≈ ({∅} × 𝐴) ∧ 𝐵 ≈ ({1o} × ({∅} × 𝐵)) ∧ (({∅} × 𝐴) ∩ ({1o} × ({∅} × 𝐵))) = ∅) → (𝐴𝐵) ≈ (({∅} × 𝐴) ∪ ({1o} × ({∅} × 𝐵))))
215, 17, 19, 20syl3anc 1199 . . 3 ((𝐴𝑉𝐵𝑊𝐶𝑋) → (𝐴𝐵) ≈ (({∅} × 𝐴) ∪ ({1o} × ({∅} × 𝐵))))
226snex 4077 . . . . . . 7 {1o} ∈ V
23 simp3 966 . . . . . . 7 ((𝐴𝑉𝐵𝑊𝐶𝑋) → 𝐶𝑋)
24 xpexg 4621 . . . . . . 7 (({1o} ∈ V ∧ 𝐶𝑋) → ({1o} × 𝐶) ∈ V)
2522, 23, 24sylancr 408 . . . . . 6 ((𝐴𝑉𝐵𝑊𝐶𝑋) → ({1o} × 𝐶) ∈ V)
26 xpsnen2g 6689 . . . . . 6 ((1o ∈ V ∧ ({1o} × 𝐶) ∈ V) → ({1o} × ({1o} × 𝐶)) ≈ ({1o} × 𝐶))
276, 25, 26sylancr 408 . . . . 5 ((𝐴𝑉𝐵𝑊𝐶𝑋) → ({1o} × ({1o} × 𝐶)) ≈ ({1o} × 𝐶))
28 xpsnen2g 6689 . . . . . 6 ((1o ∈ V ∧ 𝐶𝑋) → ({1o} × 𝐶) ≈ 𝐶)
296, 23, 28sylancr 408 . . . . 5 ((𝐴𝑉𝐵𝑊𝐶𝑋) → ({1o} × 𝐶) ≈ 𝐶)
30 entr 6644 . . . . 5 ((({1o} × ({1o} × 𝐶)) ≈ ({1o} × 𝐶) ∧ ({1o} × 𝐶) ≈ 𝐶) → ({1o} × ({1o} × 𝐶)) ≈ 𝐶)
3127, 29, 30syl2anc 406 . . . 4 ((𝐴𝑉𝐵𝑊𝐶𝑋) → ({1o} × ({1o} × 𝐶)) ≈ 𝐶)
3231ensymd 6643 . . 3 ((𝐴𝑉𝐵𝑊𝐶𝑋) → 𝐶 ≈ ({1o} × ({1o} × 𝐶)))
33 indir 3293 . . . . 5 ((({∅} × 𝐴) ∪ ({1o} × ({∅} × 𝐵))) ∩ ({1o} × ({1o} × 𝐶))) = ((({∅} × 𝐴) ∩ ({1o} × ({1o} × 𝐶))) ∪ (({1o} × ({∅} × 𝐵)) ∩ ({1o} × ({1o} × 𝐶))))
34 xp01disjl 6297 . . . . . . 7 (({∅} × 𝐴) ∩ ({1o} × ({1o} × 𝐶))) = ∅
35 xp01disjl 6297 . . . . . . . . 9 (({∅} × 𝐵) ∩ ({1o} × 𝐶)) = ∅
3635xpeq2i 4528 . . . . . . . 8 ({1o} × (({∅} × 𝐵) ∩ ({1o} × 𝐶))) = ({1o} × ∅)
37 xpindi 4642 . . . . . . . 8 ({1o} × (({∅} × 𝐵) ∩ ({1o} × 𝐶))) = (({1o} × ({∅} × 𝐵)) ∩ ({1o} × ({1o} × 𝐶)))
38 xp0 4926 . . . . . . . 8 ({1o} × ∅) = ∅
3936, 37, 383eqtr3i 2144 . . . . . . 7 (({1o} × ({∅} × 𝐵)) ∩ ({1o} × ({1o} × 𝐶))) = ∅
4034, 39uneq12i 3196 . . . . . 6 ((({∅} × 𝐴) ∩ ({1o} × ({1o} × 𝐶))) ∪ (({1o} × ({∅} × 𝐵)) ∩ ({1o} × ({1o} × 𝐶)))) = (∅ ∪ ∅)
41 un0 3364 . . . . . 6 (∅ ∪ ∅) = ∅
4240, 41eqtri 2136 . . . . 5 ((({∅} × 𝐴) ∩ ({1o} × ({1o} × 𝐶))) ∪ (({1o} × ({∅} × 𝐵)) ∩ ({1o} × ({1o} × 𝐶)))) = ∅
4333, 42eqtri 2136 . . . 4 ((({∅} × 𝐴) ∪ ({1o} × ({∅} × 𝐵))) ∩ ({1o} × ({1o} × 𝐶))) = ∅
4443a1i 9 . . 3 ((𝐴𝑉𝐵𝑊𝐶𝑋) → ((({∅} × 𝐴) ∪ ({1o} × ({∅} × 𝐵))) ∩ ({1o} × ({1o} × 𝐶))) = ∅)
45 djuenun 7032 . . 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 1199 . 2 ((𝐴𝑉𝐵𝑊𝐶𝑋) → ((𝐴𝐵) ⊔ 𝐶) ≈ ((({∅} × 𝐴) ∪ ({1o} × ({∅} × 𝐵))) ∪ ({1o} × ({1o} × 𝐶))))
47 df-dju 6889 . . . . . 6 (𝐵𝐶) = (({∅} × 𝐵) ∪ ({1o} × 𝐶))
4847xpeq2i 4528 . . . . 5 ({1o} × (𝐵𝐶)) = ({1o} × (({∅} × 𝐵) ∪ ({1o} × 𝐶)))
49 xpundi 4563 . . . . 5 ({1o} × (({∅} × 𝐵) ∪ ({1o} × 𝐶))) = (({1o} × ({∅} × 𝐵)) ∪ ({1o} × ({1o} × 𝐶)))
5048, 49eqtri 2136 . . . 4 ({1o} × (𝐵𝐶)) = (({1o} × ({∅} × 𝐵)) ∪ ({1o} × ({1o} × 𝐶)))
5150uneq2i 3195 . . 3 (({∅} × 𝐴) ∪ ({1o} × (𝐵𝐶))) = (({∅} × 𝐴) ∪ (({1o} × ({∅} × 𝐵)) ∪ ({1o} × ({1o} × 𝐶))))
52 df-dju 6889 . . 3 (𝐴 ⊔ (𝐵𝐶)) = (({∅} × 𝐴) ∪ ({1o} × (𝐵𝐶)))
53 unass 3201 . . 3 ((({∅} × 𝐴) ∪ ({1o} × ({∅} × 𝐵))) ∪ ({1o} × ({1o} × 𝐶))) = (({∅} × 𝐴) ∪ (({1o} × ({∅} × 𝐵)) ∪ ({1o} × ({1o} × 𝐶))))
5451, 52, 533eqtr4i 2146 . 2 (𝐴 ⊔ (𝐵𝐶)) = ((({∅} × 𝐴) ∪ ({1o} × ({∅} × 𝐵))) ∪ ({1o} × ({1o} × 𝐶)))
5546, 54breqtrrdi 3938 1 ((𝐴𝑉𝐵𝑊𝐶𝑋) → ((𝐴𝐵) ⊔ 𝐶) ≈ (𝐴 ⊔ (𝐵𝐶)))
Colors of variables: wff set class
Syntax hints:  wi 4  w3a 945   = wceq 1314  wcel 1463  Vcvv 2658  cun 3037  cin 3038  c0 3331  {csn 3495   class class class wbr 3897   × cxp 4505  1oc1o 6272  cen 6598  cdju 6888
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 586  ax-in2 587  ax-io 681  ax-5 1406  ax-7 1407  ax-gen 1408  ax-ie1 1452  ax-ie2 1453  ax-8 1465  ax-10 1466  ax-11 1467  ax-i12 1468  ax-bndl 1469  ax-4 1470  ax-13 1474  ax-14 1475  ax-17 1489  ax-i9 1493  ax-ial 1497  ax-i5r 1498  ax-ext 2097  ax-coll 4011  ax-sep 4014  ax-nul 4022  ax-pow 4066  ax-pr 4099  ax-un 4323
This theorem depends on definitions:  df-bi 116  df-3an 947  df-tru 1317  df-fal 1320  df-nf 1420  df-sb 1719  df-eu 1978  df-mo 1979  df-clab 2102  df-cleq 2108  df-clel 2111  df-nfc 2245  df-ne 2284  df-ral 2396  df-rex 2397  df-reu 2398  df-rab 2400  df-v 2660  df-sbc 2881  df-csb 2974  df-dif 3041  df-un 3043  df-in 3045  df-ss 3052  df-nul 3332  df-pw 3480  df-sn 3501  df-pr 3502  df-op 3504  df-uni 3705  df-int 3740  df-iun 3783  df-br 3898  df-opab 3958  df-mpt 3959  df-tr 3995  df-id 4183  df-iord 4256  df-on 4258  df-suc 4261  df-xp 4513  df-rel 4514  df-cnv 4515  df-co 4516  df-dm 4517  df-rn 4518  df-res 4519  df-ima 4520  df-iota 5056  df-fun 5093  df-fn 5094  df-f 5095  df-f1 5096  df-fo 5097  df-f1o 5098  df-fv 5099  df-1st 6004  df-2nd 6005  df-1o 6279  df-er 6395  df-en 6601  df-dju 6889  df-inl 6898  df-inr 6899
This theorem is referenced by: (None)
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