Theorem domsdomtr 7642

Description: Transitivity of dominance and strict dominance. Theorem 22(ii) of [Suppes] p. 97. (Contributed by NM, 10-Jun-1998.) (Revised by Mario Carneiro, 26-Apr-2015.)

Assertion

Ref	Expression
domsdomtr	|- ( ( A ~<_ B /\ B ~< C ) -> A ~< C )

Proof of Theorem domsdomtr

Step	Hyp	Ref	Expression
1		sdomdom 7533	. . 3 |- ( B ~< C -> B ~<_ C )
2		domtr 7558	. . 3 |- ( ( A ~<_ B /\ B ~<_ C ) -> A ~<_ C )
3	1, 2	sylan2 474	. 2 |- ( ( A ~<_ B /\ B ~< C ) -> A ~<_ C )
4		simpr 461	. . 3 |- ( ( A ~<_ B /\ B ~< C ) -> B ~< C )
5		ensym 7554	. . . . . 6 |- ( A ~~ C -> C ~~ A )
6		simpl 457	. . . . . 6 |- ( ( A ~<_ B /\ B ~< C ) -> A ~<_ B )
7		endomtr 7563	. . . . . 6 |- ( ( C ~~ A /\ A ~<_ B ) -> C ~<_ B )
8	5, 6, 7	syl2anr 478	. . . . 5 |- ( ( ( A ~<_ B /\ B ~< C ) /\ A ~~ C ) -> C ~<_ B )
9		domnsym 7633	. . . . 5 |- ( C ~<_ B -> -. B ~< C )
10	8, 9	syl 16	. . . 4 |- ( ( ( A ~<_ B /\ B ~< C ) /\ A ~~ C ) -> -. B ~< C )
11	10	ex 434	. . 3 |- ( ( A ~<_ B /\ B ~< C ) -> ( A ~~ C -> -. B ~< C ) )
12	4, 11	mt2d 117	. 2 |- ( ( A ~<_ B /\ B ~< C ) -> -. A ~~ C )
13		brsdom 7528	. 2 |- ( A ~< C <-> ( A ~<_ C /\ -. A ~~ C ) )
14	3, 12, 13	sylanbrc 664	1 |- ( ( A ~<_ B /\ B ~< C ) -> A ~< C )

Syntax hints:   -. wn 3   -> wi 4   /\ wa 369   class class class wbr 4440   ~~ cen 7503   ~<_ cdom 7504   ~< csdm 7505

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1596  ax-4 1607  ax-5 1675  ax-6 1714  ax-7 1734  ax-8 1764  ax-9 1766  ax-10 1781  ax-11 1786  ax-12 1798  ax-13 1961  ax-ext 2438  ax-sep 4561  ax-nul 4569  ax-pow 4618  ax-pr 4679  ax-un 6567

This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-3an 970  df-tru 1377  df-ex 1592  df-nf 1595  df-sb 1707  df-eu 2272  df-mo 2273  df-clab 2446  df-cleq 2452  df-clel 2455  df-nfc 2610  df-ne 2657  df-ral 2812  df-rex 2813  df-rab 2816  df-v 3108  df-dif 3472  df-un 3474  df-in 3476  df-ss 3483  df-nul 3779  df-if 3933  df-pw 4005  df-sn 4021  df-pr 4023  df-op 4027  df-uni 4239  df-br 4441  df-opab 4499  df-id 4788  df-xp 4998  df-rel 4999  df-cnv 5000  df-co 5001  df-dm 5002  df-rn 5003  df-res 5004  df-ima 5005  df-fun 5581  df-fn 5582  df-f 5583  df-f1 5584  df-fo 5585  df-f1o 5586  df-er 7301  df-en 7507  df-dom 7508  df-sdom 7509

This theorem is referenced by:  ensdomtr  7643  sdomtr  7645  2pwuninel  7662  card2on  7969  tskwe  8320  harval2  8367  prdom2  8373  infxpenlem  8380  alephsucdom  8449  pwsdompw  8573  infunsdom1  8582  fin34  8759  ondomon  8927  cardmin  8928  konigthlem  8932  gchpwdom  9037  gchina  9066  inar1  9142  tskord  9147  tskuni  9150  tskurn  9156  csdfil  20123