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Theorem trcoss 38505
Description: Sufficient condition for the transitivity of cosets by 𝑅. (Contributed by Peter Mazsa, 26-Dec-2018.)
Assertion
Ref Expression
trcoss (∀𝑦∃*𝑢 𝑢𝑅𝑦 → ∀𝑥𝑦𝑧((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧))
Distinct variable groups:   𝑢,𝑅,𝑥   𝑧,𝑅,𝑢   𝑦,𝑢,𝑥   𝑦,𝑧
Allowed substitution hint:   𝑅(𝑦)

Proof of Theorem trcoss
StepHypRef Expression
1 moantr 38387 . . . . 5 (∃*𝑢 𝑢𝑅𝑦 → ((∃𝑢(𝑢𝑅𝑥𝑢𝑅𝑦) ∧ ∃𝑢(𝑢𝑅𝑦𝑢𝑅𝑧)) → ∃𝑢(𝑢𝑅𝑥𝑢𝑅𝑧)))
2 brcoss 38454 . . . . . . 7 ((𝑥 ∈ V ∧ 𝑦 ∈ V) → (𝑥𝑅𝑦 ↔ ∃𝑢(𝑢𝑅𝑥𝑢𝑅𝑦)))
32el2v 3471 . . . . . 6 (𝑥𝑅𝑦 ↔ ∃𝑢(𝑢𝑅𝑥𝑢𝑅𝑦))
4 brcoss 38454 . . . . . . 7 ((𝑦 ∈ V ∧ 𝑧 ∈ V) → (𝑦𝑅𝑧 ↔ ∃𝑢(𝑢𝑅𝑦𝑢𝑅𝑧)))
54el2v 3471 . . . . . 6 (𝑦𝑅𝑧 ↔ ∃𝑢(𝑢𝑅𝑦𝑢𝑅𝑧))
63, 5anbi12i 628 . . . . 5 ((𝑥𝑅𝑦𝑦𝑅𝑧) ↔ (∃𝑢(𝑢𝑅𝑥𝑢𝑅𝑦) ∧ ∃𝑢(𝑢𝑅𝑦𝑢𝑅𝑧)))
7 brcoss 38454 . . . . . 6 ((𝑥 ∈ V ∧ 𝑧 ∈ V) → (𝑥𝑅𝑧 ↔ ∃𝑢(𝑢𝑅𝑥𝑢𝑅𝑧)))
87el2v 3471 . . . . 5 (𝑥𝑅𝑧 ↔ ∃𝑢(𝑢𝑅𝑥𝑢𝑅𝑧))
91, 6, 83imtr4g 296 . . . 4 (∃*𝑢 𝑢𝑅𝑦 → ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧))
109alrimiv 1927 . . 3 (∃*𝑢 𝑢𝑅𝑦 → ∀𝑧((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧))
1110alimi 1811 . 2 (∀𝑦∃*𝑢 𝑢𝑅𝑦 → ∀𝑦𝑧((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧))
1211alrimiv 1927 1 (∀𝑦∃*𝑢 𝑢𝑅𝑦 → ∀𝑥𝑦𝑧((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 206  wa 395  wal 1538  wex 1779  ∃*wmo 2538  Vcvv 3464   class class class wbr 5124  ccoss 38204
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2708  ax-sep 5271  ax-nul 5281  ax-pr 5407
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2540  df-clab 2715  df-cleq 2728  df-clel 2810  df-rab 3421  df-v 3466  df-dif 3934  df-un 3936  df-ss 3948  df-nul 4314  df-if 4506  df-sn 4607  df-pr 4609  df-op 4613  df-br 5125  df-opab 5187  df-coss 38434
This theorem is referenced by:  disjim  38804
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