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Theorem ltmulgt11 9011
Description: Multiplication by a number greater than 1. (Contributed by NM, 24-Dec-2005.)
Assertion
Ref Expression
ltmulgt11  |-  ( ( A  e.  RR  /\  B  e.  RR  /\  0  <  A )  ->  (
1  <  B  <->  A  <  ( A  x.  B ) ) )

Proof of Theorem ltmulgt11
StepHypRef Expression
1 1re 8145 . . . . 5  |-  1  e.  RR
2 ltmul2 9003 . . . . 5  |-  ( ( 1  e.  RR  /\  B  e.  RR  /\  ( A  e.  RR  /\  0  <  A ) )  -> 
( 1  <  B  <->  ( A  x.  1 )  <  ( A  x.  B ) ) )
31, 2mp3an1 1358 . . . 4  |-  ( ( B  e.  RR  /\  ( A  e.  RR  /\  0  <  A ) )  ->  ( 1  <  B  <->  ( A  x.  1 )  <  ( A  x.  B )
) )
433impb 1223 . . 3  |-  ( ( B  e.  RR  /\  A  e.  RR  /\  0  <  A )  ->  (
1  <  B  <->  ( A  x.  1 )  <  ( A  x.  B )
) )
543com12 1231 . 2  |-  ( ( A  e.  RR  /\  B  e.  RR  /\  0  <  A )  ->  (
1  <  B  <->  ( A  x.  1 )  <  ( A  x.  B )
) )
6 ax-1rid 8106 . . . 4  |-  ( A  e.  RR  ->  ( A  x.  1 )  =  A )
763ad2ant1 1042 . . 3  |-  ( ( A  e.  RR  /\  B  e.  RR  /\  0  <  A )  ->  ( A  x.  1 )  =  A )
87breq1d 4093 . 2  |-  ( ( A  e.  RR  /\  B  e.  RR  /\  0  <  A )  ->  (
( A  x.  1 )  <  ( A  x.  B )  <->  A  <  ( A  x.  B ) ) )
95, 8bitrd 188 1  |-  ( ( A  e.  RR  /\  B  e.  RR  /\  0  <  A )  ->  (
1  <  B  <->  A  <  ( A  x.  B ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    <-> wb 105    /\ w3a 1002    = wceq 1395    e. wcel 2200   class class class wbr 4083  (class class class)co 6001   RRcr 7998   0cc0 7999   1c1 8000    x. cmul 8004    < clt 8181
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 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-sep 4202  ax-pow 4258  ax-pr 4293  ax-un 4524  ax-setind 4629  ax-cnex 8090  ax-resscn 8091  ax-1cn 8092  ax-1re 8093  ax-icn 8094  ax-addcl 8095  ax-addrcl 8096  ax-mulcl 8097  ax-mulrcl 8098  ax-addcom 8099  ax-mulcom 8100  ax-addass 8101  ax-mulass 8102  ax-distr 8103  ax-i2m1 8104  ax-1rid 8106  ax-0id 8107  ax-rnegex 8108  ax-precex 8109  ax-cnre 8110  ax-pre-ltadd 8115  ax-pre-mulgt0 8116
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ne 2401  df-nel 2496  df-ral 2513  df-rex 2514  df-reu 2515  df-rab 2517  df-v 2801  df-sbc 3029  df-dif 3199  df-un 3201  df-in 3203  df-ss 3210  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3889  df-br 4084  df-opab 4146  df-id 4384  df-xp 4725  df-rel 4726  df-cnv 4727  df-co 4728  df-dm 4729  df-iota 5278  df-fun 5320  df-fv 5326  df-riota 5954  df-ov 6004  df-oprab 6005  df-mpo 6006  df-pnf 8183  df-mnf 8184  df-ltxr 8186  df-sub 8319  df-neg 8320
This theorem is referenced by:  ltmulgt12  9012  ltmulgt11d  9928  efltim  12209  nprm  12645
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