Theorem poirr 5465

Description: A partial order 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 1091	. . 3 ⊢ ((𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴) ↔ ((𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴) ∧ 𝐵 ∈ 𝐴))
2		anabs1 662	. . 3 ⊢ (((𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴) ∧ 𝐵 ∈ 𝐴) ↔ (𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴))
3		anidm 568	. . 3 ⊢ ((𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴) ↔ 𝐵 ∈ 𝐴)
4	1, 2, 3	3bitrri 301	. 2 ⊢ (𝐵 ∈ 𝐴 ↔ (𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴))
5		pocl 5460	. . . 4 ⊢ (𝑅 Po 𝐴 → ((𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴) → (¬ 𝐵𝑅𝐵 ∧ ((𝐵𝑅𝐵 ∧ 𝐵𝑅𝐵) → 𝐵𝑅𝐵))))
6	5	imp 410	. . 3 ⊢ ((𝑅 Po 𝐴 ∧ (𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴)) → (¬ 𝐵𝑅𝐵 ∧ ((𝐵𝑅𝐵 ∧ 𝐵𝑅𝐵) → 𝐵𝑅𝐵)))
7	6	simpld 498	. 2 ⊢ ((𝑅 Po 𝐴 ∧ (𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴 ∧ 𝐵 ∈ 𝐴)) → ¬ 𝐵𝑅𝐵)
8	4, 7	sylan2b 597	1 ⊢ ((𝑅 Po 𝐴 ∧ 𝐵 ∈ 𝐴) → ¬ 𝐵𝑅𝐵)

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 399   ∧ w3a 1089   ∈ wcel 2112   class class class wbr 5039   Po wpo 5451

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1803  ax-4 1817  ax-5 1918  ax-6 1976  ax-7 2018  ax-8 2114  ax-9 2122  ax-ext 2708

This theorem depends on definitions:  df-bi 210  df-an 400  df-or 848  df-3an 1091  df-tru 1546  df-fal 1556  df-ex 1788  df-sb 2073  df-clab 2715  df-cleq 2728  df-clel 2809  df-ral 3056  df-rab 3060  df-v 3400  df-dif 3856  df-un 3858  df-nul 4224  df-if 4426  df-sn 4528  df-pr 4530  df-op 4534  df-br 5040  df-po 5453

This theorem is referenced by:  po2nr  5467  po2ne  5469  pofun  5471  sonr  5476  poirr2  5969  predpoirr  6169  soisoi  7115  poxp  7873  swoer  8399  frfi  8894  wemappo  9143  zorn2lem3  10077  ex-po  28472  pocnv  33400  poseq  33482  ipo0  41681