Theorem ltleletr 7100

Description: Transitive law, weaker form of ( A < B /\ B <_ C ) -> A < C. (Contributed by AV, 14-Oct-2018.)

Assertion

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

Proof of Theorem ltleletr

Step	Hyp	Ref	Expression
1		lttr 7092	. . . . . 6 |- ( ( C e. RR /\ A e. RR /\ B e. RR ) -> ( ( C < A /\ A < B ) -> C < B ) )
2	1	3coml 1111	. . . . 5 |- ( ( A e. RR /\ B e. RR /\ C e. RR ) -> ( ( C < A /\ A < B ) -> C < B ) )
3	2	expcomd 1330	. . . 4 |- ( ( A e. RR /\ B e. RR /\ C e. RR ) -> ( A < B -> ( C < A -> C < B ) ) )
4		con3 571	. . . 4 |- ( ( C < A -> C < B ) -> ( -. C < B -> -. C < A ) )
5	3, 4	syl6 29	. . 3 |- ( ( A e. RR /\ B e. RR /\ C e. RR ) -> ( A < B -> ( -. C < B -> -. C < A ) ) )
6		lenlt 7094	. . . . 5 |- ( ( B e. RR /\ C e. RR ) -> ( B <_ C <-> -. C < B ) )
7	6	3adant1 922	. . . 4 |- ( ( A e. RR /\ B e. RR /\ C e. RR ) -> ( B <_ C <-> -. C < B ) )
8		lenlt 7094	. . . . 5 |- ( ( A e. RR /\ C e. RR ) -> ( A <_ C <-> -. C < A ) )
9	8	3adant2 923	. . . 4 |- ( ( A e. RR /\ B e. RR /\ C e. RR ) -> ( A <_ C <-> -. C < A ) )
10	7, 9	imbi12d 223	. . 3 |- ( ( A e. RR /\ B e. RR /\ C e. RR ) -> ( ( B <_ C -> A <_ C ) <-> ( -. C < B -> -. C < A ) ) )
11	5, 10	sylibrd 158	. 2 |- ( ( A e. RR /\ B e. RR /\ C e. RR ) -> ( A < B -> ( B <_ C -> A <_ C ) ) )
12	11	impd 242	1 |- ( ( A e. RR /\ B e. RR /\ C e. RR ) -> ( ( A < B /\ B <_ C ) -> A <_ C ) )

Syntax hints:   -. wn 3   -> wi 4   /\ wa 97   <-> wb 98   /\ w3a 885   e. wcel 1393   class class class wbr 3764   RRcr 6888   < clt 7060   <_ cle 7061

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-in1 544  ax-in2 545  ax-io 630  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-10 1396  ax-11 1397  ax-i12 1398  ax-bndl 1399  ax-4 1400  ax-13 1404  ax-14 1405  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428  ax-ext 2022  ax-sep 3875  ax-pow 3927  ax-pr 3944  ax-un 4170  ax-setind 4262  ax-cnex 6975  ax-resscn 6976  ax-pre-lttrn 6998

This theorem depends on definitions:  df-bi 110  df-3an 887  df-tru 1246  df-fal 1249  df-nf 1350  df-sb 1646  df-eu 1903  df-mo 1904  df-clab 2027  df-cleq 2033  df-clel 2036  df-nfc 2167  df-ne 2206  df-nel 2207  df-ral 2311  df-rex 2312  df-rab 2315  df-v 2559  df-dif 2920  df-un 2922  df-in 2924  df-ss 2931  df-pw 3361  df-sn 3381  df-pr 3382  df-op 3384  df-uni 3581  df-br 3765  df-opab 3819  df-xp 4351  df-cnv 4353  df-pnf 7062  df-mnf 7063  df-xr 7064  df-ltxr 7065  df-le 7066

This theorem is referenced by:  nn0ge2m1nn  8242  lbzbi  8551