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Theorem kmlem4 9176
 Description: Lemma for 5-quantifier AC of Kurt Maes, Th. 4, part of 3 => 4. (Contributed by NM, 26-Mar-2004.)
Assertion
Ref Expression
kmlem4 ((𝑤𝑥𝑧𝑤) → ((𝑧 (𝑥 ∖ {𝑧})) ∩ 𝑤) = ∅)
Distinct variable group:   𝑥,𝑤,𝑧

Proof of Theorem kmlem4
Dummy variables 𝑣 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 eleq1w 2832 . . . . . . 7 (𝑣 = 𝑤 → (𝑣𝑥𝑤𝑥))
2 neeq2 3005 . . . . . . 7 (𝑣 = 𝑤 → (𝑧𝑣𝑧𝑤))
31, 2anbi12d 608 . . . . . 6 (𝑣 = 𝑤 → ((𝑣𝑥𝑧𝑣) ↔ (𝑤𝑥𝑧𝑤)))
4 elequ2 2158 . . . . . . 7 (𝑣 = 𝑤 → (𝑦𝑣𝑦𝑤))
54notbid 307 . . . . . 6 (𝑣 = 𝑤 → (¬ 𝑦𝑣 ↔ ¬ 𝑦𝑤))
63, 5imbi12d 333 . . . . 5 (𝑣 = 𝑤 → (((𝑣𝑥𝑧𝑣) → ¬ 𝑦𝑣) ↔ ((𝑤𝑥𝑧𝑤) → ¬ 𝑦𝑤)))
76spv 2421 . . . 4 (∀𝑣((𝑣𝑥𝑧𝑣) → ¬ 𝑦𝑣) → ((𝑤𝑥𝑧𝑤) → ¬ 𝑦𝑤))
8 eldif 3731 . . . . 5 (𝑦 ∈ (𝑧 (𝑥 ∖ {𝑧})) ↔ (𝑦𝑧 ∧ ¬ 𝑦 (𝑥 ∖ {𝑧})))
9 simpr 471 . . . . . 6 ((𝑦𝑧 ∧ ¬ 𝑦 (𝑥 ∖ {𝑧})) → ¬ 𝑦 (𝑥 ∖ {𝑧}))
10 eluni 4575 . . . . . . . 8 (𝑦 (𝑥 ∖ {𝑧}) ↔ ∃𝑣(𝑦𝑣𝑣 ∈ (𝑥 ∖ {𝑧})))
1110notbii 309 . . . . . . 7 𝑦 (𝑥 ∖ {𝑧}) ↔ ¬ ∃𝑣(𝑦𝑣𝑣 ∈ (𝑥 ∖ {𝑧})))
12 alnex 1853 . . . . . . 7 (∀𝑣 ¬ (𝑦𝑣𝑣 ∈ (𝑥 ∖ {𝑧})) ↔ ¬ ∃𝑣(𝑦𝑣𝑣 ∈ (𝑥 ∖ {𝑧})))
13 con2b 348 . . . . . . . . 9 ((𝑦𝑣 → ¬ 𝑣 ∈ (𝑥 ∖ {𝑧})) ↔ (𝑣 ∈ (𝑥 ∖ {𝑧}) → ¬ 𝑦𝑣))
14 imnan 386 . . . . . . . . 9 ((𝑦𝑣 → ¬ 𝑣 ∈ (𝑥 ∖ {𝑧})) ↔ ¬ (𝑦𝑣𝑣 ∈ (𝑥 ∖ {𝑧})))
15 eldifsn 4451 . . . . . . . . . . 11 (𝑣 ∈ (𝑥 ∖ {𝑧}) ↔ (𝑣𝑥𝑣𝑧))
16 necom 2995 . . . . . . . . . . . 12 (𝑣𝑧𝑧𝑣)
1716anbi2i 601 . . . . . . . . . . 11 ((𝑣𝑥𝑣𝑧) ↔ (𝑣𝑥𝑧𝑣))
1815, 17bitri 264 . . . . . . . . . 10 (𝑣 ∈ (𝑥 ∖ {𝑧}) ↔ (𝑣𝑥𝑧𝑣))
1918imbi1i 338 . . . . . . . . 9 ((𝑣 ∈ (𝑥 ∖ {𝑧}) → ¬ 𝑦𝑣) ↔ ((𝑣𝑥𝑧𝑣) → ¬ 𝑦𝑣))
2013, 14, 193bitr3i 290 . . . . . . . 8 (¬ (𝑦𝑣𝑣 ∈ (𝑥 ∖ {𝑧})) ↔ ((𝑣𝑥𝑧𝑣) → ¬ 𝑦𝑣))
2120albii 1894 . . . . . . 7 (∀𝑣 ¬ (𝑦𝑣𝑣 ∈ (𝑥 ∖ {𝑧})) ↔ ∀𝑣((𝑣𝑥𝑧𝑣) → ¬ 𝑦𝑣))
2211, 12, 213bitr2i 288 . . . . . 6 𝑦 (𝑥 ∖ {𝑧}) ↔ ∀𝑣((𝑣𝑥𝑧𝑣) → ¬ 𝑦𝑣))
239, 22sylib 208 . . . . 5 ((𝑦𝑧 ∧ ¬ 𝑦 (𝑥 ∖ {𝑧})) → ∀𝑣((𝑣𝑥𝑧𝑣) → ¬ 𝑦𝑣))
248, 23sylbi 207 . . . 4 (𝑦 ∈ (𝑧 (𝑥 ∖ {𝑧})) → ∀𝑣((𝑣𝑥𝑧𝑣) → ¬ 𝑦𝑣))
257, 24syl11 33 . . 3 ((𝑤𝑥𝑧𝑤) → (𝑦 ∈ (𝑧 (𝑥 ∖ {𝑧})) → ¬ 𝑦𝑤))
2625ralrimiv 3113 . 2 ((𝑤𝑥𝑧𝑤) → ∀𝑦 ∈ (𝑧 (𝑥 ∖ {𝑧})) ¬ 𝑦𝑤)
27 disj 4158 . 2 (((𝑧 (𝑥 ∖ {𝑧})) ∩ 𝑤) = ∅ ↔ ∀𝑦 ∈ (𝑧 (𝑥 ∖ {𝑧})) ¬ 𝑦𝑤)
2826, 27sylibr 224 1 ((𝑤𝑥𝑧𝑤) → ((𝑧 (𝑥 ∖ {𝑧})) ∩ 𝑤) = ∅)
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 382  ∀wal 1628   = wceq 1630  ∃wex 1851   ∈ wcel 2144   ≠ wne 2942  ∀wral 3060   ∖ cdif 3718   ∩ cin 3720  ∅c0 4061  {csn 4314  ∪ cuni 4572 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1869  ax-4 1884  ax-5 1990  ax-6 2056  ax-7 2092  ax-9 2153  ax-10 2173  ax-11 2189  ax-12 2202  ax-13 2407  ax-ext 2750 This theorem depends on definitions:  df-bi 197  df-an 383  df-or 827  df-tru 1633  df-ex 1852  df-nf 1857  df-sb 2049  df-clab 2757  df-cleq 2763  df-clel 2766  df-nfc 2901  df-ne 2943  df-ral 3065  df-v 3351  df-dif 3724  df-in 3728  df-nul 4062  df-sn 4315  df-uni 4573 This theorem is referenced by:  kmlem5  9177  kmlem11  9183
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