ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  cnvsom GIF version

Theorem cnvsom 5278
Description: The converse of a strict order relation is a strict order relation. (Contributed by Jim Kingdon, 19-Dec-2018.)
Assertion
Ref Expression
cnvsom (∃𝑥 𝑥𝐴 → (𝑅 Or 𝐴𝑅 Or 𝐴))
Distinct variable groups:   𝑥,𝐴   𝑥,𝑅

Proof of Theorem cnvsom
Dummy variables 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 cnvpom 5277 . . 3 (∃𝑥 𝑥𝐴 → (𝑅 Po 𝐴𝑅 Po 𝐴))
2 vex 2803 . . . . . . . . 9 𝑦 ∈ V
3 vex 2803 . . . . . . . . 9 𝑥 ∈ V
42, 3brcnv 4911 . . . . . . . 8 (𝑦𝑅𝑥𝑥𝑅𝑦)
5 vex 2803 . . . . . . . . . . 11 𝑧 ∈ V
62, 5brcnv 4911 . . . . . . . . . 10 (𝑦𝑅𝑧𝑧𝑅𝑦)
75, 3brcnv 4911 . . . . . . . . . 10 (𝑧𝑅𝑥𝑥𝑅𝑧)
86, 7orbi12i 769 . . . . . . . . 9 ((𝑦𝑅𝑧𝑧𝑅𝑥) ↔ (𝑧𝑅𝑦𝑥𝑅𝑧))
9 orcom 733 . . . . . . . . 9 ((𝑧𝑅𝑦𝑥𝑅𝑧) ↔ (𝑥𝑅𝑧𝑧𝑅𝑦))
108, 9bitri 184 . . . . . . . 8 ((𝑦𝑅𝑧𝑧𝑅𝑥) ↔ (𝑥𝑅𝑧𝑧𝑅𝑦))
114, 10imbi12i 239 . . . . . . 7 ((𝑦𝑅𝑥 → (𝑦𝑅𝑧𝑧𝑅𝑥)) ↔ (𝑥𝑅𝑦 → (𝑥𝑅𝑧𝑧𝑅𝑦)))
1211ralbii 2536 . . . . . 6 (∀𝑧𝐴 (𝑦𝑅𝑥 → (𝑦𝑅𝑧𝑧𝑅𝑥)) ↔ ∀𝑧𝐴 (𝑥𝑅𝑦 → (𝑥𝑅𝑧𝑧𝑅𝑦)))
13122ralbii 2538 . . . . 5 (∀𝑥𝐴𝑦𝐴𝑧𝐴 (𝑦𝑅𝑥 → (𝑦𝑅𝑧𝑧𝑅𝑥)) ↔ ∀𝑥𝐴𝑦𝐴𝑧𝐴 (𝑥𝑅𝑦 → (𝑥𝑅𝑧𝑧𝑅𝑦)))
14 ralcom 2694 . . . . 5 (∀𝑥𝐴𝑦𝐴𝑧𝐴 (𝑦𝑅𝑥 → (𝑦𝑅𝑧𝑧𝑅𝑥)) ↔ ∀𝑦𝐴𝑥𝐴𝑧𝐴 (𝑦𝑅𝑥 → (𝑦𝑅𝑧𝑧𝑅𝑥)))
1513, 14bitr3i 186 . . . 4 (∀𝑥𝐴𝑦𝐴𝑧𝐴 (𝑥𝑅𝑦 → (𝑥𝑅𝑧𝑧𝑅𝑦)) ↔ ∀𝑦𝐴𝑥𝐴𝑧𝐴 (𝑦𝑅𝑥 → (𝑦𝑅𝑧𝑧𝑅𝑥)))
1615a1i 9 . . 3 (∃𝑥 𝑥𝐴 → (∀𝑥𝐴𝑦𝐴𝑧𝐴 (𝑥𝑅𝑦 → (𝑥𝑅𝑧𝑧𝑅𝑦)) ↔ ∀𝑦𝐴𝑥𝐴𝑧𝐴 (𝑦𝑅𝑥 → (𝑦𝑅𝑧𝑧𝑅𝑥))))
171, 16anbi12d 473 . 2 (∃𝑥 𝑥𝐴 → ((𝑅 Po 𝐴 ∧ ∀𝑥𝐴𝑦𝐴𝑧𝐴 (𝑥𝑅𝑦 → (𝑥𝑅𝑧𝑧𝑅𝑦))) ↔ (𝑅 Po 𝐴 ∧ ∀𝑦𝐴𝑥𝐴𝑧𝐴 (𝑦𝑅𝑥 → (𝑦𝑅𝑧𝑧𝑅𝑥)))))
18 df-iso 4392 . 2 (𝑅 Or 𝐴 ↔ (𝑅 Po 𝐴 ∧ ∀𝑥𝐴𝑦𝐴𝑧𝐴 (𝑥𝑅𝑦 → (𝑥𝑅𝑧𝑧𝑅𝑦))))
19 df-iso 4392 . 2 (𝑅 Or 𝐴 ↔ (𝑅 Po 𝐴 ∧ ∀𝑦𝐴𝑥𝐴𝑧𝐴 (𝑦𝑅𝑥 → (𝑦𝑅𝑧𝑧𝑅𝑥))))
2017, 18, 193bitr4g 223 1 (∃𝑥 𝑥𝐴 → (𝑅 Or 𝐴𝑅 Or 𝐴))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  wb 105  wo 713  wex 1538  wcel 2200  wral 2508   class class class wbr 4086   Po wpo 4389   Or wor 4390  ccnv 4722
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-14 2203  ax-ext 2211  ax-sep 4205  ax-pow 4262  ax-pr 4297
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-v 2802  df-un 3202  df-in 3204  df-ss 3211  df-pw 3652  df-sn 3673  df-pr 3674  df-op 3676  df-br 4087  df-opab 4149  df-po 4391  df-iso 4392  df-cnv 4731
This theorem is referenced by:  gtso  8248
  Copyright terms: Public domain W3C validator