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Theorem posasymb 16892
 Description: A poset ordering is asymmetric. (Contributed by NM, 21-Oct-2011.)
Hypotheses
Ref Expression
posi.b 𝐵 = (Base‘𝐾)
posi.l = (le‘𝐾)
Assertion
Ref Expression
posasymb ((𝐾 ∈ Poset ∧ 𝑋𝐵𝑌𝐵) → ((𝑋 𝑌𝑌 𝑋) ↔ 𝑋 = 𝑌))

Proof of Theorem posasymb
StepHypRef Expression
1 simp1 1059 . . . 4 ((𝐾 ∈ Poset ∧ 𝑋𝐵𝑌𝐵) → 𝐾 ∈ Poset)
2 simp2 1060 . . . 4 ((𝐾 ∈ Poset ∧ 𝑋𝐵𝑌𝐵) → 𝑋𝐵)
3 simp3 1061 . . . 4 ((𝐾 ∈ Poset ∧ 𝑋𝐵𝑌𝐵) → 𝑌𝐵)
4 posi.b . . . . 5 𝐵 = (Base‘𝐾)
5 posi.l . . . . 5 = (le‘𝐾)
64, 5posi 16890 . . . 4 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑌𝐵)) → (𝑋 𝑋 ∧ ((𝑋 𝑌𝑌 𝑋) → 𝑋 = 𝑌) ∧ ((𝑋 𝑌𝑌 𝑌) → 𝑋 𝑌)))
71, 2, 3, 3, 6syl13anc 1325 . . 3 ((𝐾 ∈ Poset ∧ 𝑋𝐵𝑌𝐵) → (𝑋 𝑋 ∧ ((𝑋 𝑌𝑌 𝑋) → 𝑋 = 𝑌) ∧ ((𝑋 𝑌𝑌 𝑌) → 𝑋 𝑌)))
87simp2d 1072 . 2 ((𝐾 ∈ Poset ∧ 𝑋𝐵𝑌𝐵) → ((𝑋 𝑌𝑌 𝑋) → 𝑋 = 𝑌))
94, 5posref 16891 . . . . 5 ((𝐾 ∈ Poset ∧ 𝑋𝐵) → 𝑋 𝑋)
10 breq2 4627 . . . . 5 (𝑋 = 𝑌 → (𝑋 𝑋𝑋 𝑌))
119, 10syl5ibcom 235 . . . 4 ((𝐾 ∈ Poset ∧ 𝑋𝐵) → (𝑋 = 𝑌𝑋 𝑌))
12 breq1 4626 . . . . 5 (𝑋 = 𝑌 → (𝑋 𝑋𝑌 𝑋))
139, 12syl5ibcom 235 . . . 4 ((𝐾 ∈ Poset ∧ 𝑋𝐵) → (𝑋 = 𝑌𝑌 𝑋))
1411, 13jcad 555 . . 3 ((𝐾 ∈ Poset ∧ 𝑋𝐵) → (𝑋 = 𝑌 → (𝑋 𝑌𝑌 𝑋)))
15143adant3 1079 . 2 ((𝐾 ∈ Poset ∧ 𝑋𝐵𝑌𝐵) → (𝑋 = 𝑌 → (𝑋 𝑌𝑌 𝑋)))
168, 15impbid 202 1 ((𝐾 ∈ Poset ∧ 𝑋𝐵𝑌𝐵) → ((𝑋 𝑌𝑌 𝑋) ↔ 𝑋 = 𝑌))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 196   ∧ wa 384   ∧ w3a 1036   = wceq 1480   ∈ wcel 1987   class class class wbr 4623  ‘cfv 5857  Basecbs 15800  lecple 15888  Posetcpo 16880 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-nul 4759 This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ral 2913  df-rex 2914  df-rab 2917  df-v 3192  df-sbc 3423  df-dif 3563  df-un 3565  df-in 3567  df-ss 3574  df-nul 3898  df-if 4065  df-sn 4156  df-pr 4158  df-op 4162  df-uni 4410  df-br 4624  df-iota 5820  df-fv 5865  df-preset 16868  df-poset 16886 This theorem is referenced by:  pltnle  16906  pltval3  16907  lublecllem  16928  latasymb  16994  latleeqj1  17003  latleeqm1  17019  odupos  17075  poslubmo  17086  posglbmo  17087  posrasymb  29484  archirngz  29570  archiabllem1a  29572  ople0  33993  op1le  33998  atlle0  34111
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