Theorem xrletr 9806

Description: Transitive law for ordering on extended reals. (Contributed by NM, 9-Feb-2006.)

Assertion

Ref	Expression
xrletr	|- ( ( A e. RR* /\ B e. RR* /\ C e. RR* ) -> ( ( A <_ B /\ B <_ C ) -> A <_ C ) )

Proof of Theorem xrletr

Step	Hyp	Ref	Expression
1		xrltso 9794	. . . . . 6 |- < Or RR*
2		sowlin 4320	. . . . . 6 |- ( ( < Or RR* /\ ( C e. RR* /\ A e. RR* /\ B e. RR* ) ) -> ( C < A -> ( C < B \/ B < A ) ) )
3	1, 2	mpan 424	. . . . 5 |- ( ( C e. RR* /\ A e. RR* /\ B e. RR* ) -> ( C < A -> ( C < B \/ B < A ) ) )
4	3	3coml 1210	. . . 4 |- ( ( A e. RR* /\ B e. RR* /\ C e. RR* ) -> ( C < A -> ( C < B \/ B < A ) ) )
5		orcom 728	. . . 4 |- ( ( C < B \/ B < A ) <-> ( B < A \/ C < B ) )
6	4, 5	imbitrdi 161	. . 3 |- ( ( A e. RR* /\ B e. RR* /\ C e. RR* ) -> ( C < A -> ( B < A \/ C < B ) ) )
7	6	con3d 631	. 2 |- ( ( A e. RR* /\ B e. RR* /\ C e. RR* ) -> ( -. ( B < A \/ C < B ) -> -. C < A ) )
8		xrlenlt 8020	. . . . 5 |- ( ( A e. RR* /\ B e. RR* ) -> ( A <_ B <-> -. B < A ) )
9	8	3adant3 1017	. . . 4 |- ( ( A e. RR* /\ B e. RR* /\ C e. RR* ) -> ( A <_ B <-> -. B < A ) )
10		xrlenlt 8020	. . . . 5 |- ( ( B e. RR* /\ C e. RR* ) -> ( B <_ C <-> -. C < B ) )
11	10	3adant1 1015	. . . 4 |- ( ( A e. RR* /\ B e. RR* /\ C e. RR* ) -> ( B <_ C <-> -. C < B ) )
12	9, 11	anbi12d 473	. . 3 |- ( ( A e. RR* /\ B e. RR* /\ C e. RR* ) -> ( ( A <_ B /\ B <_ C ) <-> ( -. B < A /\ -. C < B ) ) )
13		ioran 752	. . 3 |- ( -. ( B < A \/ C < B ) <-> ( -. B < A /\ -. C < B ) )
14	12, 13	bitr4di 198	. 2 |- ( ( A e. RR* /\ B e. RR* /\ C e. RR* ) -> ( ( A <_ B /\ B <_ C ) <-> -. ( B < A \/ C < B ) ) )
15		xrlenlt 8020	. . 3 |- ( ( A e. RR* /\ C e. RR* ) -> ( A <_ C <-> -. C < A ) )
16	15	3adant2 1016	. 2 |- ( ( A e. RR* /\ B e. RR* /\ C e. RR* ) -> ( A <_ C <-> -. C < A ) )
17	7, 14, 16	3imtr4d 203	1 |- ( ( A e. RR* /\ B e. RR* /\ C e. RR* ) -> ( ( A <_ B /\ B <_ C ) -> A <_ C ) )

Syntax hints:   -. wn 3   -> wi 4   /\ wa 104   <-> wb 105   \/ wo 708   /\ w3a 978   e. wcel 2148   class class class wbr 4003   Or wor 4295   RR*cxr 7989   < clt 7990   <_ cle 7991

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 614  ax-in2 615  ax-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-13 2150  ax-14 2151  ax-ext 2159  ax-sep 4121  ax-pow 4174  ax-pr 4209  ax-un 4433  ax-setind 4536  ax-cnex 7901  ax-resscn 7902  ax-pre-ltirr 7922  ax-pre-ltwlin 7923  ax-pre-lttrn 7924

This theorem depends on definitions:  df-bi 117  df-3or 979  df-3an 980  df-tru 1356  df-fal 1359  df-nf 1461  df-sb 1763  df-eu 2029  df-mo 2030  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ne 2348  df-nel 2443  df-ral 2460  df-rex 2461  df-rab 2464  df-v 2739  df-dif 3131  df-un 3133  df-in 3135  df-ss 3142  df-pw 3577  df-sn 3598  df-pr 3599  df-op 3601  df-uni 3810  df-br 4004  df-opab 4065  df-po 4296  df-iso 4297  df-xp 4632  df-cnv 4634  df-pnf 7992  df-mnf 7993  df-xr 7994  df-ltxr 7995  df-le 7996

This theorem is referenced by:  xrletrd  9810  xle2add  9877  icc0r  9924  iccss  9939  icossico  9941  iccss2  9942  iccssico  9943  bdxmet  13894