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Theorem posasymb 17538
 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 1132 . . . 4 ((𝐾 ∈ Poset ∧ 𝑋𝐵𝑌𝐵) → 𝐾 ∈ Poset)
2 simp2 1133 . . . 4 ((𝐾 ∈ Poset ∧ 𝑋𝐵𝑌𝐵) → 𝑋𝐵)
3 simp3 1134 . . . 4 ((𝐾 ∈ Poset ∧ 𝑋𝐵𝑌𝐵) → 𝑌𝐵)
4 posi.b . . . . 5 𝐵 = (Base‘𝐾)
5 posi.l . . . . 5 = (le‘𝐾)
64, 5posi 17536 . . . 4 ((𝐾 ∈ Poset ∧ (𝑋𝐵𝑌𝐵𝑌𝐵)) → (𝑋 𝑋 ∧ ((𝑋 𝑌𝑌 𝑋) → 𝑋 = 𝑌) ∧ ((𝑋 𝑌𝑌 𝑌) → 𝑋 𝑌)))
71, 2, 3, 3, 6syl13anc 1368 . . 3 ((𝐾 ∈ Poset ∧ 𝑋𝐵𝑌𝐵) → (𝑋 𝑋 ∧ ((𝑋 𝑌𝑌 𝑋) → 𝑋 = 𝑌) ∧ ((𝑋 𝑌𝑌 𝑌) → 𝑋 𝑌)))
87simp2d 1139 . 2 ((𝐾 ∈ Poset ∧ 𝑋𝐵𝑌𝐵) → ((𝑋 𝑌𝑌 𝑋) → 𝑋 = 𝑌))
94, 5posref 17537 . . . . 5 ((𝐾 ∈ Poset ∧ 𝑋𝐵) → 𝑋 𝑋)
10 breq2 5044 . . . . 5 (𝑋 = 𝑌 → (𝑋 𝑋𝑋 𝑌))
119, 10syl5ibcom 247 . . . 4 ((𝐾 ∈ Poset ∧ 𝑋𝐵) → (𝑋 = 𝑌𝑋 𝑌))
12 breq1 5043 . . . . 5 (𝑋 = 𝑌 → (𝑋 𝑋𝑌 𝑋))
139, 12syl5ibcom 247 . . . 4 ((𝐾 ∈ Poset ∧ 𝑋𝐵) → (𝑋 = 𝑌𝑌 𝑋))
1411, 13jcad 515 . . 3 ((𝐾 ∈ Poset ∧ 𝑋𝐵) → (𝑋 = 𝑌 → (𝑋 𝑌𝑌 𝑋)))
15143adant3 1128 . 2 ((𝐾 ∈ Poset ∧ 𝑋𝐵𝑌𝐵) → (𝑋 = 𝑌 → (𝑋 𝑌𝑌 𝑋)))
168, 15impbid 214 1 ((𝐾 ∈ Poset ∧ 𝑋𝐵𝑌𝐵) → ((𝑋 𝑌𝑌 𝑋) ↔ 𝑋 = 𝑌))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 208   ∧ wa 398   ∧ w3a 1083   = wceq 1537   ∈ wcel 2114   class class class wbr 5040  ‘cfv 6329  Basecbs 16459  lecple 16548  Posetcpo 17526 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 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2792  ax-nul 5184 This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2653  df-clab 2799  df-cleq 2813  df-clel 2891  df-nfc 2959  df-ral 3130  df-rex 3131  df-rab 3134  df-v 3475  df-sbc 3752  df-dif 3915  df-un 3917  df-in 3919  df-ss 3928  df-nul 4268  df-if 4442  df-sn 4542  df-pr 4544  df-op 4548  df-uni 4813  df-br 5041  df-iota 6288  df-fv 6337  df-proset 17514  df-poset 17532 This theorem is referenced by:  pltnle  17552  pltval3  17553  lublecllem  17574  latasymb  17640  latleeqj1  17649  latleeqm1  17665  odupos  17721  poslubmo  17732  posglbmo  17733  posrasymb  30628  archirngz  30823  archiabllem1a  30825  ople0  36356  op1le  36361  atlle0  36474
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