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Theorem posn 5618
Description: Partial ordering of a singleton. (Contributed by NM, 27-Apr-2009.) (Revised by Mario Carneiro, 23-Apr-2015.)
Assertion
Ref Expression
posn (Rel 𝑅 → (𝑅 Po {𝐴} ↔ ¬ 𝐴𝑅𝐴))

Proof of Theorem posn
Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 po0 5469 . . . . . 6 𝑅 Po ∅
2 snprc 4618 . . . . . . 7 𝐴 ∈ V ↔ {𝐴} = ∅)
3 poeq2 5456 . . . . . . 7 ({𝐴} = ∅ → (𝑅 Po {𝐴} ↔ 𝑅 Po ∅))
42, 3sylbi 220 . . . . . 6 𝐴 ∈ V → (𝑅 Po {𝐴} ↔ 𝑅 Po ∅))
51, 4mpbiri 261 . . . . 5 𝐴 ∈ V → 𝑅 Po {𝐴})
65adantl 485 . . . 4 ((Rel 𝑅 ∧ ¬ 𝐴 ∈ V) → 𝑅 Po {𝐴})
7 brrelex1 5586 . . . . 5 ((Rel 𝑅𝐴𝑅𝐴) → 𝐴 ∈ V)
87stoic1a 1779 . . . 4 ((Rel 𝑅 ∧ ¬ 𝐴 ∈ V) → ¬ 𝐴𝑅𝐴)
96, 82thd 268 . . 3 ((Rel 𝑅 ∧ ¬ 𝐴 ∈ V) → (𝑅 Po {𝐴} ↔ ¬ 𝐴𝑅𝐴))
109ex 416 . 2 (Rel 𝑅 → (¬ 𝐴 ∈ V → (𝑅 Po {𝐴} ↔ ¬ 𝐴𝑅𝐴)))
11 df-po 5452 . . 3 (𝑅 Po {𝐴} ↔ ∀𝑥 ∈ {𝐴}∀𝑦 ∈ {𝐴}∀𝑧 ∈ {𝐴} (¬ 𝑥𝑅𝑥 ∧ ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧)))
12 breq2 5044 . . . . . . . . . . 11 (𝑧 = 𝐴 → (𝑦𝑅𝑧𝑦𝑅𝐴))
1312anbi2d 632 . . . . . . . . . 10 (𝑧 = 𝐴 → ((𝑥𝑅𝑦𝑦𝑅𝑧) ↔ (𝑥𝑅𝑦𝑦𝑅𝐴)))
14 breq2 5044 . . . . . . . . . 10 (𝑧 = 𝐴 → (𝑥𝑅𝑧𝑥𝑅𝐴))
1513, 14imbi12d 348 . . . . . . . . 9 (𝑧 = 𝐴 → (((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧) ↔ ((𝑥𝑅𝑦𝑦𝑅𝐴) → 𝑥𝑅𝐴)))
1615anbi2d 632 . . . . . . . 8 (𝑧 = 𝐴 → ((¬ 𝑥𝑅𝑥 ∧ ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧)) ↔ (¬ 𝑥𝑅𝑥 ∧ ((𝑥𝑅𝑦𝑦𝑅𝐴) → 𝑥𝑅𝐴))))
1716ralsng 4574 . . . . . . 7 (𝐴 ∈ V → (∀𝑧 ∈ {𝐴} (¬ 𝑥𝑅𝑥 ∧ ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧)) ↔ (¬ 𝑥𝑅𝑥 ∧ ((𝑥𝑅𝑦𝑦𝑅𝐴) → 𝑥𝑅𝐴))))
1817ralbidv 3110 . . . . . 6 (𝐴 ∈ V → (∀𝑦 ∈ {𝐴}∀𝑧 ∈ {𝐴} (¬ 𝑥𝑅𝑥 ∧ ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧)) ↔ ∀𝑦 ∈ {𝐴} (¬ 𝑥𝑅𝑥 ∧ ((𝑥𝑅𝑦𝑦𝑅𝐴) → 𝑥𝑅𝐴))))
19 simpl 486 . . . . . . . . . 10 ((𝑥𝑅𝑦𝑦𝑅𝐴) → 𝑥𝑅𝑦)
20 breq2 5044 . . . . . . . . . 10 (𝑦 = 𝐴 → (𝑥𝑅𝑦𝑥𝑅𝐴))
2119, 20syl5ib 247 . . . . . . . . 9 (𝑦 = 𝐴 → ((𝑥𝑅𝑦𝑦𝑅𝐴) → 𝑥𝑅𝐴))
2221biantrud 535 . . . . . . . 8 (𝑦 = 𝐴 → (¬ 𝑥𝑅𝑥 ↔ (¬ 𝑥𝑅𝑥 ∧ ((𝑥𝑅𝑦𝑦𝑅𝐴) → 𝑥𝑅𝐴))))
2322bicomd 226 . . . . . . 7 (𝑦 = 𝐴 → ((¬ 𝑥𝑅𝑥 ∧ ((𝑥𝑅𝑦𝑦𝑅𝐴) → 𝑥𝑅𝐴)) ↔ ¬ 𝑥𝑅𝑥))
2423ralsng 4574 . . . . . 6 (𝐴 ∈ V → (∀𝑦 ∈ {𝐴} (¬ 𝑥𝑅𝑥 ∧ ((𝑥𝑅𝑦𝑦𝑅𝐴) → 𝑥𝑅𝐴)) ↔ ¬ 𝑥𝑅𝑥))
2518, 24bitrd 282 . . . . 5 (𝐴 ∈ V → (∀𝑦 ∈ {𝐴}∀𝑧 ∈ {𝐴} (¬ 𝑥𝑅𝑥 ∧ ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧)) ↔ ¬ 𝑥𝑅𝑥))
2625ralbidv 3110 . . . 4 (𝐴 ∈ V → (∀𝑥 ∈ {𝐴}∀𝑦 ∈ {𝐴}∀𝑧 ∈ {𝐴} (¬ 𝑥𝑅𝑥 ∧ ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧)) ↔ ∀𝑥 ∈ {𝐴} ¬ 𝑥𝑅𝑥))
27 breq12 5045 . . . . . . 7 ((𝑥 = 𝐴𝑥 = 𝐴) → (𝑥𝑅𝑥𝐴𝑅𝐴))
2827anidms 570 . . . . . 6 (𝑥 = 𝐴 → (𝑥𝑅𝑥𝐴𝑅𝐴))
2928notbid 321 . . . . 5 (𝑥 = 𝐴 → (¬ 𝑥𝑅𝑥 ↔ ¬ 𝐴𝑅𝐴))
3029ralsng 4574 . . . 4 (𝐴 ∈ V → (∀𝑥 ∈ {𝐴} ¬ 𝑥𝑅𝑥 ↔ ¬ 𝐴𝑅𝐴))
3126, 30bitrd 282 . . 3 (𝐴 ∈ V → (∀𝑥 ∈ {𝐴}∀𝑦 ∈ {𝐴}∀𝑧 ∈ {𝐴} (¬ 𝑥𝑅𝑥 ∧ ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧)) ↔ ¬ 𝐴𝑅𝐴))
3211, 31syl5bb 286 . 2 (𝐴 ∈ V → (𝑅 Po {𝐴} ↔ ¬ 𝐴𝑅𝐴))
3310, 32pm2.61d2 184 1 (Rel 𝑅 → (𝑅 Po {𝐴} ↔ ¬ 𝐴𝑅𝐴))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 209  wa 399   = wceq 1542  wcel 2114  wral 3054  Vcvv 3400  c0 4221  {csn 4526   class class class wbr 5040   Po wpo 5450  Rel wrel 5540
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1975  ax-7 2020  ax-8 2116  ax-9 2124  ax-ext 2711  ax-sep 5177  ax-nul 5184  ax-pr 5306
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 847  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1787  df-sb 2075  df-clab 2718  df-cleq 2731  df-clel 2812  df-ral 3059  df-rex 3060  df-v 3402  df-dif 3856  df-un 3858  df-in 3860  df-ss 3870  df-nul 4222  df-if 4425  df-sn 4527  df-pr 4529  df-op 4533  df-br 5041  df-opab 5103  df-po 5452  df-xp 5541  df-rel 5542
This theorem is referenced by:  sosn  5619
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