Theorem ensdomtr 5534

Description: Transitivity of equinumerosity and strict dominance.

Assertion

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

Proof of Theorem ensdomtr

Step	Hyp	Ref	Expression
1		endomtr 5479	. . . . . . 7 |- ((A ~~ B /\ B ~<_ C) -> A ~<_ C)
2	1	ex 402	. . . . . 6 |- (A ~~ B -> (B ~<_ C -> A ~<_ C))
3	2	adantl 424	. . . . 5 |- ((B e. _V /\ A ~~ B) -> (B ~<_ C -> A ~<_ C))
4		ensymg 5470	. . . . . . . 8 |- (B e. _V -> (A ~~ B -> B ~~ A))
5	4	imp 377	. . . . . . 7 |- ((B e. _V /\ A ~~ B) -> B ~~ A)
6		entr 5473	. . . . . . . 8 |- ((B ~~ A /\ A ~~ C) -> B ~~ C)
7	6	ex 402	. . . . . . 7 |- (B ~~ A -> (A ~~ C -> B ~~ C))
8	5, 7	syl 12	. . . . . 6 |- ((B e. _V /\ A ~~ B) -> (A ~~ C -> B ~~ C))
9	8	con3d 111	. . . . 5 |- ((B e. _V /\ A ~~ B) -> (-. B ~~ C -> -. A ~~ C))
10	3, 9	anim12d 617	. . . 4 |- ((B e. _V /\ A ~~ B) -> ((B ~<_ C /\ -. B ~~ C) -> (A ~<_ C /\ -. A ~~ C)))
11		brsdom 5440	. . . 4 |- (B ~< C <-> (B ~<_ C /\ -. B ~~ C))
12		brsdom 5440	. . . 4 |- (A ~< C <-> (A ~<_ C /\ -. A ~~ C))
13	10, 11, 12	3imtr4g 612	. . 3 |- ((B e. _V /\ A ~~ B) -> (B ~< C -> A ~< C))
14	13	expimpd 404	. 2 |- (B e. _V -> ((A ~~ B /\ B ~< C) -> A ~< C))
15		relsdom 5433	. . . . . 6 |- Rel ~<
16	15	brrelexi 4029	. . . . 5 |- (B ~< C -> B e. _V)
17	16	con3i 114	. . . 4 |- (-. B e. _V -> -. B ~< C)
18	17	pm2.21d 94	. . 3 |- (-. B e. _V -> (B ~< C -> A ~< C))
19	18	adantld 426	. 2 |- (-. B e. _V -> ((A ~~ B /\ B ~< C) -> A ~< C))
20	14, 19	pm2.61i 140	1 |- ((A ~~ B /\ B ~< C) -> A ~< C)

Syntax hints:  -. wn 2   -> wi 3   /\ wa 240   e. wcel 1300  _Vcvv 2292   class class class wbr 3338   ~~ cen 5423   ~<_ cdom 5424   ~< csdm 5425

This theorem is referenced by:  sdomen1 5544  isfinite2 5639  pm54.43 5662  alephordi 6022  resdomq 8819  aleph1re 8820  infdif 8837  infpss 8843  aleph1irr 8847  1nprm 13769  top2ind 14897  cptarc 15242  tarsuc2 15245  ufilen 15579

This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 1304  ax-gen 1305  ax-8 1306  ax-9 1307  ax-10 1308  ax-11 1309  ax-12 1310  ax-13 1311  ax-14 1312  ax-17 1317  ax-4 1319  ax-5o 1321  ax-6o 1324  ax-9o 1481  ax-10o 1500  ax-16 1580  ax-11o 1588  ax-ext 1865  ax-rep 3428  ax-sep 3438  ax-nul 3445  ax-pow 3481  ax-pr 3524  ax-un 3790

This theorem depends on definitions:  df-bi 164  df-or 241  df-an 242  df-3an 860  df-ex 1327  df-sb 1536  df-eu 1775  df-mo 1776  df-clab 1872  df-cleq 1877  df-clel 1880  df-ne 2019  df-rex 2110  df-v 2294  df-dif 2597  df-un 2600  df-in 2603  df-ss 2605  df-nul 2876  df-pw 3035  df-sn 3049  df-pr 3050  df-op 3053  df-uni 3178  df-br 3339  df-opab 3396  df-id 3586  df-xp 4000  df-rel 4001  df-cnv 4002  df-co 4003  df-dm 4004  df-rn 4005  df-res 4006  df-ima 4007  df-fun 4008  df-fn 4009  df-f 4010  df-f1 4011  df-fo 4012  df-f1o 4013  df-er 5318  df-en 5427  df-dom 5428  df-sdom 5429

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