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Theorem br2coss 38539
Description: Cosets by 𝑅 binary relation. (Contributed by Peter Mazsa, 25-Aug-2019.)
Assertion
Ref Expression
br2coss ((𝐴𝑉𝐵𝑊) → (𝐴 ≀ ≀ 𝑅𝐵 ↔ ([𝐴] ≀ 𝑅 ∩ [𝐵] ≀ 𝑅) ≠ ∅))

Proof of Theorem br2coss
StepHypRef Expression
1 brcoss3 38534 . 2 ((𝐴𝑉𝐵𝑊) → (𝐴 ≀ ≀ 𝑅𝐵 ↔ ([𝐴]𝑅 ∩ [𝐵]𝑅) ≠ ∅))
2 cnvcosseq 38538 . . . . 5 𝑅 = ≀ 𝑅
32eceq2i 8664 . . . 4 [𝐴]𝑅 = [𝐴] ≀ 𝑅
42eceq2i 8664 . . . 4 [𝐵]𝑅 = [𝐵] ≀ 𝑅
53, 4ineq12i 4165 . . 3 ([𝐴]𝑅 ∩ [𝐵]𝑅) = ([𝐴] ≀ 𝑅 ∩ [𝐵] ≀ 𝑅)
65neeq1i 2992 . 2 (([𝐴]𝑅 ∩ [𝐵]𝑅) ≠ ∅ ↔ ([𝐴] ≀ 𝑅 ∩ [𝐵] ≀ 𝑅) ≠ ∅)
71, 6bitrdi 287 1 ((𝐴𝑉𝐵𝑊) → (𝐴 ≀ ≀ 𝑅𝐵 ↔ ([𝐴] ≀ 𝑅 ∩ [𝐵] ≀ 𝑅) ≠ ∅))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 206  wa 395  wcel 2111  wne 2928  cin 3896  c0 4280   class class class wbr 5089  ccnv 5613  [cec 8620  ccoss 38221
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2113  ax-9 2121  ax-ext 2703  ax-sep 5232  ax-nul 5242  ax-pr 5368
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-sb 2068  df-clab 2710  df-cleq 2723  df-clel 2806  df-ne 2929  df-ral 3048  df-rex 3057  df-rab 3396  df-v 3438  df-dif 3900  df-un 3902  df-in 3904  df-ss 3914  df-nul 4281  df-if 4473  df-sn 4574  df-pr 4576  df-op 4580  df-br 5090  df-opab 5152  df-xp 5620  df-rel 5621  df-cnv 5622  df-dm 5624  df-rn 5625  df-res 5626  df-ima 5627  df-ec 8624  df-coss 38512
This theorem is referenced by: (None)
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