Theorem poirr 4403

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

Assertion

Ref	Expression
poirr	|- ( ( R Po A /\ B e. A ) -> -. B R B )

Proof of Theorem poirr

Step	Hyp	Ref	Expression
1		df-3an 1006	. . 3 |- ( ( B e. A /\ B e. A /\ B e. A ) <-> ( ( B e. A /\ B e. A ) /\ B e. A ) )
2		anabs1 574	. . 3 |- ( ( ( B e. A /\ B e. A ) /\ B e. A ) <-> ( B e. A /\ B e. A ) )
3		anidm 396	. . 3 |- ( ( B e. A /\ B e. A ) <-> B e. A )
4	1, 2, 3	3bitrri 207	. 2 |- ( B e. A <-> ( B e. A /\ B e. A /\ B e. A ) )
5		pocl 4399	. . . 4 |- ( R Po A -> ( ( B e. A /\ B e. A /\ B e. A ) -> ( -. B R B /\ ( ( B R B /\ B R B ) -> B R B ) ) ) )
6	5	imp 124	. . 3 |- ( ( R Po A /\ ( B e. A /\ B e. A /\ B e. A ) ) -> ( -. B R B /\ ( ( B R B /\ B R B ) -> B R B ) ) )
7	6	simpld 112	. 2 |- ( ( R Po A /\ ( B e. A /\ B e. A /\ B e. A ) ) -> -. B R B )
8	4, 7	sylan2b 287	1 |- ( ( R Po A /\ B e. A ) -> -. B R B )

Syntax hints:   -. wn 3   -> wi 4   /\ wa 104   /\ w3a 1004   e. wcel 2201   class class class wbr 4087   Po wpo 4390

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-ext 2212

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1810  df-clab 2217  df-cleq 2223  df-clel 2226  df-nfc 2362  df-ral 2514  df-v 2803  df-un 3203  df-sn 3674  df-pr 3675  df-op 3677  df-br 4088  df-po 4392

This theorem is referenced by:  po2nr  4405  pofun  4408  sonr  4413  poirr2  5128  poxp  6399  swoer  6732  tridc  7091  fimax2gtrilemstep  7092