Theorem poirr 4970

Description: A partial order relation is irreflexive. (Contributed by NM, 27-Mar-1997.)

Assertion

Ref	Expression
poirr	⊢ ((𝑅 Po 𝐴 ∧ 𝐵 ∈ 𝐴) → ¬ 𝐵𝑅𝐵)

Proof of Theorem poirr

Step	Hyp	Ref	Expression
1		df-3an 1033	. . 3 ⊢ ((𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴) ↔ ((𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴) ∧ 𝐵 ∈ 𝐴))
2		anabs1 846	. . 3 ⊢ (((𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴) ∧ 𝐵 ∈ 𝐴) ↔ (𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴))
3		anidm 674	. . 3 ⊢ ((𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴) ↔ 𝐵 ∈ 𝐴)
4	1, 2, 3	3bitrri 286	. 2 ⊢ (𝐵 ∈ 𝐴 ↔ (𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴))
5		pocl 4966	. . . 4 ⊢ (𝑅 Po 𝐴 → ((𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴) → (¬ 𝐵𝑅𝐵 ∧ ((𝐵𝑅𝐵 ∧ 𝐵𝑅𝐵) → 𝐵𝑅𝐵))))
6	5	imp 444	. . 3 ⊢ ((𝑅 Po 𝐴 ∧ (𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴)) → (¬ 𝐵𝑅𝐵 ∧ ((𝐵𝑅𝐵 ∧ 𝐵𝑅𝐵) → 𝐵𝑅𝐵)))
7	6	simpld 474	. 2 ⊢ ((𝑅 Po 𝐴 ∧ (𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴)) → ¬ 𝐵𝑅𝐵)
8	4, 7	sylan2b 491	1 ⊢ ((𝑅 Po 𝐴 ∧ 𝐵 ∈ 𝐴) → ¬ 𝐵𝑅𝐵)

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 383   ∧ w3a 1031   ∈ wcel 1977   class class class wbr 4583   Po wpo 4957

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ral 2901  df-rab 2905  df-v 3175  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-if 4037  df-sn 4126  df-pr 4128  df-op 4132  df-br 4584  df-po 4959

This theorem is referenced by:  po2nr  4972  pofun  4975  sonr  4980  poirr2  5439  predpoirr  5625  soisoi  6478  poxp  7176  swoer  7659  frfi  8090  wemappo  8337  zorn2lem3  9203  ex-po  26684  pocnv  30907  poseq  30994  ipo0  37674