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Theorem untangtr 31898
Description: A transitive class is untangled iff its elements are. (Contributed by Scott Fenton, 7-Mar-2011.)
Assertion
Ref Expression
untangtr (Tr 𝐴 → (∀𝑥𝐴 ¬ 𝑥𝑥 ↔ ∀𝑥𝐴𝑦𝑥 ¬ 𝑦𝑦))
Distinct variable group:   𝑥,𝑦,𝐴

Proof of Theorem untangtr
StepHypRef Expression
1 df-tr 4905 . . . 4 (Tr 𝐴 𝐴𝐴)
2 ssralv 3807 . . . 4 ( 𝐴𝐴 → (∀𝑥𝐴 ¬ 𝑥𝑥 → ∀𝑥 𝐴 ¬ 𝑥𝑥))
31, 2sylbi 207 . . 3 (Tr 𝐴 → (∀𝑥𝐴 ¬ 𝑥𝑥 → ∀𝑥 𝐴 ¬ 𝑥𝑥))
4 elequ1 2146 . . . . . . 7 (𝑥 = 𝑦 → (𝑥𝑥𝑦𝑥))
5 elequ2 2153 . . . . . . 7 (𝑥 = 𝑦 → (𝑦𝑥𝑦𝑦))
64, 5bitrd 268 . . . . . 6 (𝑥 = 𝑦 → (𝑥𝑥𝑦𝑦))
76notbid 307 . . . . 5 (𝑥 = 𝑦 → (¬ 𝑥𝑥 ↔ ¬ 𝑦𝑦))
87cbvralv 3310 . . . 4 (∀𝑥 𝐴 ¬ 𝑥𝑥 ↔ ∀𝑦 𝐴 ¬ 𝑦𝑦)
9 untuni 31893 . . . 4 (∀𝑦 𝐴 ¬ 𝑦𝑦 ↔ ∀𝑥𝐴𝑦𝑥 ¬ 𝑦𝑦)
108, 9bitri 264 . . 3 (∀𝑥 𝐴 ¬ 𝑥𝑥 ↔ ∀𝑥𝐴𝑦𝑥 ¬ 𝑦𝑦)
113, 10syl6ib 241 . 2 (Tr 𝐴 → (∀𝑥𝐴 ¬ 𝑥𝑥 → ∀𝑥𝐴𝑦𝑥 ¬ 𝑦𝑦))
12 untelirr 31892 . . 3 (∀𝑦𝑥 ¬ 𝑦𝑦 → ¬ 𝑥𝑥)
1312ralimi 3090 . 2 (∀𝑥𝐴𝑦𝑥 ¬ 𝑦𝑦 → ∀𝑥𝐴 ¬ 𝑥𝑥)
1411, 13impbid1 215 1 (Tr 𝐴 → (∀𝑥𝐴 ¬ 𝑥𝑥 ↔ ∀𝑥𝐴𝑦𝑥 ¬ 𝑦𝑦))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 196  wral 3050  wss 3715   cuni 4588  Tr wtr 4904
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-8 2141  ax-9 2148  ax-10 2168  ax-11 2183  ax-12 2196  ax-13 2391  ax-ext 2740
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  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-ral 3055  df-rex 3056  df-v 3342  df-in 3722  df-ss 3729  df-uni 4589  df-tr 4905
This theorem is referenced by: (None)
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