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Theorem ispod 4069
 Description: Sufficient conditions for a partial order. (Contributed by NM, 9-Jul-2014.)
Hypotheses
Ref Expression
ispod.1 ((𝜑𝑥𝐴) → ¬ 𝑥𝑅𝑥)
ispod.2 ((𝜑 ∧ (𝑥𝐴𝑦𝐴𝑧𝐴)) → ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧))
Assertion
Ref Expression
ispod (𝜑𝑅 Po 𝐴)
Distinct variable groups:   𝑥,𝑦,𝑧,𝐴   𝑥,𝑅,𝑦,𝑧   𝜑,𝑥,𝑦,𝑧

Proof of Theorem ispod
StepHypRef Expression
1 ispod.1 . . . . 5 ((𝜑𝑥𝐴) → ¬ 𝑥𝑅𝑥)
213ad2antr1 1080 . . . 4 ((𝜑 ∧ (𝑥𝐴𝑦𝐴𝑧𝐴)) → ¬ 𝑥𝑅𝑥)
3 ispod.2 . . . 4 ((𝜑 ∧ (𝑥𝐴𝑦𝐴𝑧𝐴)) → ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧))
42, 3jca 294 . . 3 ((𝜑 ∧ (𝑥𝐴𝑦𝐴𝑧𝐴)) → (¬ 𝑥𝑅𝑥 ∧ ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧)))
54ralrimivvva 2419 . 2 (𝜑 → ∀𝑥𝐴𝑦𝐴𝑧𝐴𝑥𝑅𝑥 ∧ ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧)))
6 df-po 4061 . 2 (𝑅 Po 𝐴 ↔ ∀𝑥𝐴𝑦𝐴𝑧𝐴𝑥𝑅𝑥 ∧ ((𝑥𝑅𝑦𝑦𝑅𝑧) → 𝑥𝑅𝑧)))
75, 6sylibr 141 1 (𝜑𝑅 Po 𝐴)
 Colors of variables: wff set class Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 101   ∧ w3a 896   ∈ wcel 1409  ∀wral 2323   class class class wbr 3792   Po wpo 4059 This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 103  ax-ia2 104  ax-ia3 105  ax-5 1352  ax-gen 1354  ax-4 1416  ax-17 1435 This theorem depends on definitions:  df-bi 114  df-3an 898  df-nf 1366  df-ral 2328  df-po 4061 This theorem is referenced by:  swopo  4071  pofun  4077  wepo  4124  ltsopi  6476  ltsonq  6554  ltpopr  6751  ltposr  6906  ltso  7155  xrltso  8818
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