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Theorem kmlem11 9174
Description: Lemma for 5-quantifier AC of Kurt Maes, Th. 4, part of 3 => 4. (Contributed by NM, 26-Mar-2004.)
Hypothesis
Ref Expression
kmlem9.1 𝐴 = {𝑢 ∣ ∃𝑡𝑥 𝑢 = (𝑡 (𝑥 ∖ {𝑡}))}
Assertion
Ref Expression
kmlem11 (𝑧𝑥 → (𝑧 𝐴) = (𝑧 (𝑥 ∖ {𝑧})))
Distinct variable groups:   𝑥,𝑧,𝑢,𝑡   𝑧,𝐴
Allowed substitution hints:   𝐴(𝑥,𝑢,𝑡)

Proof of Theorem kmlem11
StepHypRef Expression
1 kmlem9.1 . . . . . 6 𝐴 = {𝑢 ∣ ∃𝑡𝑥 𝑢 = (𝑡 (𝑥 ∖ {𝑡}))}
21unieqi 4597 . . . . 5 𝐴 = {𝑢 ∣ ∃𝑡𝑥 𝑢 = (𝑡 (𝑥 ∖ {𝑡}))}
3 vex 3343 . . . . . . 7 𝑡 ∈ V
43difexi 4961 . . . . . 6 (𝑡 (𝑥 ∖ {𝑡})) ∈ V
54dfiun2 4706 . . . . 5 𝑡𝑥 (𝑡 (𝑥 ∖ {𝑡})) = {𝑢 ∣ ∃𝑡𝑥 𝑢 = (𝑡 (𝑥 ∖ {𝑡}))}
62, 5eqtr4i 2785 . . . 4 𝐴 = 𝑡𝑥 (𝑡 (𝑥 ∖ {𝑡}))
76ineq2i 3954 . . 3 (𝑧 𝐴) = (𝑧 𝑡𝑥 (𝑡 (𝑥 ∖ {𝑡})))
8 iunin2 4736 . . 3 𝑡𝑥 (𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡}))) = (𝑧 𝑡𝑥 (𝑡 (𝑥 ∖ {𝑡})))
97, 8eqtr4i 2785 . 2 (𝑧 𝐴) = 𝑡𝑥 (𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡})))
10 undif2 4188 . . . . . 6 ({𝑧} ∪ (𝑥 ∖ {𝑧})) = ({𝑧} ∪ 𝑥)
11 snssi 4484 . . . . . . 7 (𝑧𝑥 → {𝑧} ⊆ 𝑥)
12 ssequn1 3926 . . . . . . 7 ({𝑧} ⊆ 𝑥 ↔ ({𝑧} ∪ 𝑥) = 𝑥)
1311, 12sylib 208 . . . . . 6 (𝑧𝑥 → ({𝑧} ∪ 𝑥) = 𝑥)
1410, 13syl5req 2807 . . . . 5 (𝑧𝑥𝑥 = ({𝑧} ∪ (𝑥 ∖ {𝑧})))
1514iuneq1d 4697 . . . 4 (𝑧𝑥 𝑡𝑥 (𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡}))) = 𝑡 ∈ ({𝑧} ∪ (𝑥 ∖ {𝑧}))(𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡}))))
16 iunxun 4757 . . . . . 6 𝑡 ∈ ({𝑧} ∪ (𝑥 ∖ {𝑧}))(𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡}))) = ( 𝑡 ∈ {𝑧} (𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡}))) ∪ 𝑡 ∈ (𝑥 ∖ {𝑧})(𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡}))))
17 vex 3343 . . . . . . . 8 𝑧 ∈ V
18 difeq1 3864 . . . . . . . . . 10 (𝑡 = 𝑧 → (𝑡 (𝑥 ∖ {𝑡})) = (𝑧 (𝑥 ∖ {𝑡})))
19 sneq 4331 . . . . . . . . . . . . 13 (𝑡 = 𝑧 → {𝑡} = {𝑧})
2019difeq2d 3871 . . . . . . . . . . . 12 (𝑡 = 𝑧 → (𝑥 ∖ {𝑡}) = (𝑥 ∖ {𝑧}))
2120unieqd 4598 . . . . . . . . . . 11 (𝑡 = 𝑧 (𝑥 ∖ {𝑡}) = (𝑥 ∖ {𝑧}))
2221difeq2d 3871 . . . . . . . . . 10 (𝑡 = 𝑧 → (𝑧 (𝑥 ∖ {𝑡})) = (𝑧 (𝑥 ∖ {𝑧})))
2318, 22eqtrd 2794 . . . . . . . . 9 (𝑡 = 𝑧 → (𝑡 (𝑥 ∖ {𝑡})) = (𝑧 (𝑥 ∖ {𝑧})))
2423ineq2d 3957 . . . . . . . 8 (𝑡 = 𝑧 → (𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡}))) = (𝑧 ∩ (𝑧 (𝑥 ∖ {𝑧}))))
2517, 24iunxsn 4755 . . . . . . 7 𝑡 ∈ {𝑧} (𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡}))) = (𝑧 ∩ (𝑧 (𝑥 ∖ {𝑧})))
2625uneq1i 3906 . . . . . 6 ( 𝑡 ∈ {𝑧} (𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡}))) ∪ 𝑡 ∈ (𝑥 ∖ {𝑧})(𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡})))) = ((𝑧 ∩ (𝑧 (𝑥 ∖ {𝑧}))) ∪ 𝑡 ∈ (𝑥 ∖ {𝑧})(𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡}))))
2716, 26eqtri 2782 . . . . 5 𝑡 ∈ ({𝑧} ∪ (𝑥 ∖ {𝑧}))(𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡}))) = ((𝑧 ∩ (𝑧 (𝑥 ∖ {𝑧}))) ∪ 𝑡 ∈ (𝑥 ∖ {𝑧})(𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡}))))
28 eldifsni 4466 . . . . . . . . . 10 (𝑡 ∈ (𝑥 ∖ {𝑧}) → 𝑡𝑧)
29 incom 3948 . . . . . . . . . . . 12 (𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡}))) = ((𝑡 (𝑥 ∖ {𝑡})) ∩ 𝑧)
30 kmlem4 9167 . . . . . . . . . . . 12 ((𝑧𝑥𝑡𝑧) → ((𝑡 (𝑥 ∖ {𝑡})) ∩ 𝑧) = ∅)
3129, 30syl5eq 2806 . . . . . . . . . . 11 ((𝑧𝑥𝑡𝑧) → (𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡}))) = ∅)
3231ex 449 . . . . . . . . . 10 (𝑧𝑥 → (𝑡𝑧 → (𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡}))) = ∅))
3328, 32syl5 34 . . . . . . . . 9 (𝑧𝑥 → (𝑡 ∈ (𝑥 ∖ {𝑧}) → (𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡}))) = ∅))
3433ralrimiv 3103 . . . . . . . 8 (𝑧𝑥 → ∀𝑡 ∈ (𝑥 ∖ {𝑧})(𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡}))) = ∅)
35 iuneq2 4689 . . . . . . . 8 (∀𝑡 ∈ (𝑥 ∖ {𝑧})(𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡}))) = ∅ → 𝑡 ∈ (𝑥 ∖ {𝑧})(𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡}))) = 𝑡 ∈ (𝑥 ∖ {𝑧})∅)
3634, 35syl 17 . . . . . . 7 (𝑧𝑥 𝑡 ∈ (𝑥 ∖ {𝑧})(𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡}))) = 𝑡 ∈ (𝑥 ∖ {𝑧})∅)
37 iun0 4728 . . . . . . 7 𝑡 ∈ (𝑥 ∖ {𝑧})∅ = ∅
3836, 37syl6eq 2810 . . . . . 6 (𝑧𝑥 𝑡 ∈ (𝑥 ∖ {𝑧})(𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡}))) = ∅)
3938uneq2d 3910 . . . . 5 (𝑧𝑥 → ((𝑧 ∩ (𝑧 (𝑥 ∖ {𝑧}))) ∪ 𝑡 ∈ (𝑥 ∖ {𝑧})(𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡})))) = ((𝑧 ∩ (𝑧 (𝑥 ∖ {𝑧}))) ∪ ∅))
4027, 39syl5eq 2806 . . . 4 (𝑧𝑥 𝑡 ∈ ({𝑧} ∪ (𝑥 ∖ {𝑧}))(𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡}))) = ((𝑧 ∩ (𝑧 (𝑥 ∖ {𝑧}))) ∪ ∅))
4115, 40eqtrd 2794 . . 3 (𝑧𝑥 𝑡𝑥 (𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡}))) = ((𝑧 ∩ (𝑧 (𝑥 ∖ {𝑧}))) ∪ ∅))
42 un0 4110 . . . 4 ((𝑧 ∩ (𝑧 (𝑥 ∖ {𝑧}))) ∪ ∅) = (𝑧 ∩ (𝑧 (𝑥 ∖ {𝑧})))
43 indif 4012 . . . 4 (𝑧 ∩ (𝑧 (𝑥 ∖ {𝑧}))) = (𝑧 (𝑥 ∖ {𝑧}))
4442, 43eqtri 2782 . . 3 ((𝑧 ∩ (𝑧 (𝑥 ∖ {𝑧}))) ∪ ∅) = (𝑧 (𝑥 ∖ {𝑧}))
4541, 44syl6eq 2810 . 2 (𝑧𝑥 𝑡𝑥 (𝑧 ∩ (𝑡 (𝑥 ∖ {𝑡}))) = (𝑧 (𝑥 ∖ {𝑧})))
469, 45syl5eq 2806 1 (𝑧𝑥 → (𝑧 𝐴) = (𝑧 (𝑥 ∖ {𝑧})))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 383   = wceq 1632  wcel 2139  {cab 2746  wne 2932  wral 3050  wrex 3051  cdif 3712  cun 3713  cin 3714  wss 3715  c0 4058  {csn 4321   cuni 4588   ciun 4672
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1871  ax-4 1886  ax-5 1988  ax-6 2054  ax-7 2090  ax-9 2148  ax-10 2168  ax-11 2183  ax-12 2196  ax-13 2391  ax-ext 2740  ax-sep 4933
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1074  df-tru 1635  df-ex 1854  df-nf 1859  df-sb 2047  df-clab 2747  df-cleq 2753  df-clel 2756  df-nfc 2891  df-ne 2933  df-ral 3055  df-rex 3056  df-rab 3059  df-v 3342  df-sbc 3577  df-dif 3718  df-un 3720  df-in 3722  df-ss 3729  df-nul 4059  df-sn 4322  df-uni 4589  df-iun 4674
This theorem is referenced by:  kmlem12  9175
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