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Theorem setindtr 36609
 Description: Epsilon induction for sets contained in a transitive set. If we are allowed to assume Infinity, then all sets have a transitive closure and this reduces to setind 8493; however, this version is useful without Infinity. (Contributed by Stefan O'Rear, 28-Oct-2014.)
Assertion
Ref Expression
setindtr (∀𝑥(𝑥𝐴𝑥𝐴) → (∃𝑦(Tr 𝑦𝐵𝑦) → 𝐵𝐴))
Distinct variable groups:   𝑥,𝑦,𝐴   𝑥,𝐵,𝑦

Proof of Theorem setindtr
StepHypRef Expression
1 nfv 1830 . . . . . . . . . . 11 𝑥Tr 𝑦
2 nfa1 2015 . . . . . . . . . . 11 𝑥𝑥(𝑥𝐴𝑥𝐴)
31, 2nfan 1816 . . . . . . . . . 10 𝑥(Tr 𝑦 ∧ ∀𝑥(𝑥𝐴𝑥𝐴))
4 eldifn 3695 . . . . . . . . . . . . . 14 (𝑥 ∈ (𝑦𝐴) → ¬ 𝑥𝐴)
54adantl 481 . . . . . . . . . . . . 13 (((Tr 𝑦 ∧ ∀𝑥(𝑥𝐴𝑥𝐴)) ∧ 𝑥 ∈ (𝑦𝐴)) → ¬ 𝑥𝐴)
6 trss 4689 . . . . . . . . . . . . . . . . . 18 (Tr 𝑦 → (𝑥𝑦𝑥𝑦))
7 eldifi 3694 . . . . . . . . . . . . . . . . . 18 (𝑥 ∈ (𝑦𝐴) → 𝑥𝑦)
86, 7impel 484 . . . . . . . . . . . . . . . . 17 ((Tr 𝑦𝑥 ∈ (𝑦𝐴)) → 𝑥𝑦)
9 df-ss 3554 . . . . . . . . . . . . . . . . 17 (𝑥𝑦 ↔ (𝑥𝑦) = 𝑥)
108, 9sylib 207 . . . . . . . . . . . . . . . 16 ((Tr 𝑦𝑥 ∈ (𝑦𝐴)) → (𝑥𝑦) = 𝑥)
1110adantlr 747 . . . . . . . . . . . . . . 15 (((Tr 𝑦 ∧ ∀𝑥(𝑥𝐴𝑥𝐴)) ∧ 𝑥 ∈ (𝑦𝐴)) → (𝑥𝑦) = 𝑥)
1211sseq1d 3595 . . . . . . . . . . . . . 14 (((Tr 𝑦 ∧ ∀𝑥(𝑥𝐴𝑥𝐴)) ∧ 𝑥 ∈ (𝑦𝐴)) → ((𝑥𝑦) ⊆ 𝐴𝑥𝐴))
13 sp 2041 . . . . . . . . . . . . . . 15 (∀𝑥(𝑥𝐴𝑥𝐴) → (𝑥𝐴𝑥𝐴))
1413ad2antlr 759 . . . . . . . . . . . . . 14 (((Tr 𝑦 ∧ ∀𝑥(𝑥𝐴𝑥𝐴)) ∧ 𝑥 ∈ (𝑦𝐴)) → (𝑥𝐴𝑥𝐴))
1512, 14sylbid 229 . . . . . . . . . . . . 13 (((Tr 𝑦 ∧ ∀𝑥(𝑥𝐴𝑥𝐴)) ∧ 𝑥 ∈ (𝑦𝐴)) → ((𝑥𝑦) ⊆ 𝐴𝑥𝐴))
165, 15mtod 188 . . . . . . . . . . . 12 (((Tr 𝑦 ∧ ∀𝑥(𝑥𝐴𝑥𝐴)) ∧ 𝑥 ∈ (𝑦𝐴)) → ¬ (𝑥𝑦) ⊆ 𝐴)
17 inssdif0 3901 . . . . . . . . . . . 12 ((𝑥𝑦) ⊆ 𝐴 ↔ (𝑥 ∩ (𝑦𝐴)) = ∅)
1816, 17sylnib 317 . . . . . . . . . . 11 (((Tr 𝑦 ∧ ∀𝑥(𝑥𝐴𝑥𝐴)) ∧ 𝑥 ∈ (𝑦𝐴)) → ¬ (𝑥 ∩ (𝑦𝐴)) = ∅)
1918ex 449 . . . . . . . . . 10 ((Tr 𝑦 ∧ ∀𝑥(𝑥𝐴𝑥𝐴)) → (𝑥 ∈ (𝑦𝐴) → ¬ (𝑥 ∩ (𝑦𝐴)) = ∅))
203, 19ralrimi 2940 . . . . . . . . 9 ((Tr 𝑦 ∧ ∀𝑥(𝑥𝐴𝑥𝐴)) → ∀𝑥 ∈ (𝑦𝐴) ¬ (𝑥 ∩ (𝑦𝐴)) = ∅)
21 ralnex 2975 . . . . . . . . 9 (∀𝑥 ∈ (𝑦𝐴) ¬ (𝑥 ∩ (𝑦𝐴)) = ∅ ↔ ¬ ∃𝑥 ∈ (𝑦𝐴)(𝑥 ∩ (𝑦𝐴)) = ∅)
2220, 21sylib 207 . . . . . . . 8 ((Tr 𝑦 ∧ ∀𝑥(𝑥𝐴𝑥𝐴)) → ¬ ∃𝑥 ∈ (𝑦𝐴)(𝑥 ∩ (𝑦𝐴)) = ∅)
23 vex 3176 . . . . . . . . . . 11 𝑦 ∈ V
2423difexi 4736 . . . . . . . . . 10 (𝑦𝐴) ∈ V
25 zfreg 8383 . . . . . . . . . 10 (((𝑦𝐴) ∈ V ∧ (𝑦𝐴) ≠ ∅) → ∃𝑥 ∈ (𝑦𝐴)(𝑥 ∩ (𝑦𝐴)) = ∅)
2624, 25mpan 702 . . . . . . . . 9 ((𝑦𝐴) ≠ ∅ → ∃𝑥 ∈ (𝑦𝐴)(𝑥 ∩ (𝑦𝐴)) = ∅)
2726necon1bi 2810 . . . . . . . 8 (¬ ∃𝑥 ∈ (𝑦𝐴)(𝑥 ∩ (𝑦𝐴)) = ∅ → (𝑦𝐴) = ∅)
2822, 27syl 17 . . . . . . 7 ((Tr 𝑦 ∧ ∀𝑥(𝑥𝐴𝑥𝐴)) → (𝑦𝐴) = ∅)
29 ssdif0 3896 . . . . . . 7 (𝑦𝐴 ↔ (𝑦𝐴) = ∅)
3028, 29sylibr 223 . . . . . 6 ((Tr 𝑦 ∧ ∀𝑥(𝑥𝐴𝑥𝐴)) → 𝑦𝐴)
3130adantlr 747 . . . . 5 (((Tr 𝑦𝐵𝑦) ∧ ∀𝑥(𝑥𝐴𝑥𝐴)) → 𝑦𝐴)
32 simplr 788 . . . . 5 (((Tr 𝑦𝐵𝑦) ∧ ∀𝑥(𝑥𝐴𝑥𝐴)) → 𝐵𝑦)
3331, 32sseldd 3569 . . . 4 (((Tr 𝑦𝐵𝑦) ∧ ∀𝑥(𝑥𝐴𝑥𝐴)) → 𝐵𝐴)
3433ex 449 . . 3 ((Tr 𝑦𝐵𝑦) → (∀𝑥(𝑥𝐴𝑥𝐴) → 𝐵𝐴))
3534exlimiv 1845 . 2 (∃𝑦(Tr 𝑦𝐵𝑦) → (∀𝑥(𝑥𝐴𝑥𝐴) → 𝐵𝐴))
3635com12 32 1 (∀𝑥(𝑥𝐴𝑥𝐴) → (∃𝑦(Tr 𝑦𝐵𝑦) → 𝐵𝐴))
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 383  ∀wal 1473   = wceq 1475  ∃wex 1695   ∈ wcel 1977   ≠ wne 2780  ∀wral 2896  ∃wrex 2897  Vcvv 3173   ∖ cdif 3537   ∩ cin 3539   ⊆ wss 3540  ∅c0 3874  Tr wtr 4680 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-reg 8380 This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-v 3175  df-dif 3543  df-in 3547  df-ss 3554  df-nul 3875  df-uni 4373  df-tr 4681 This theorem is referenced by:  setindtrs  36610
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