Theorem lemul2a 9029

Description: Multiplication of both sides of 'less than or equal to' by a nonnegative number. (Contributed by Paul Chapman, 7-Sep-2007.)

Assertion

Ref	Expression
lemul2a	|- ( ( ( A e. RR /\ B e. RR /\ ( C e. RR /\ 0 <_ C ) ) /\ A <_ B ) -> ( C x. A ) <_ ( C x. B ) )

Proof of Theorem lemul2a

Step	Hyp	Ref	Expression
1		lemul1a 9028	. 2 |- ( ( ( A e. RR /\ B e. RR /\ ( C e. RR /\ 0 <_ C ) ) /\ A <_ B ) -> ( A x. C ) <_ ( B x. C ) )
2		recn 8155	. . . . . 6 |- ( A e. RR -> A e. CC )
3		recn 8155	. . . . . 6 |- ( C e. RR -> C e. CC )
4		mulcom 8151	. . . . . 6 |- ( ( A e. CC /\ C e. CC ) -> ( A x. C ) = ( C x. A ) )
5	2, 3, 4	syl2an 289	. . . . 5 |- ( ( A e. RR /\ C e. RR ) -> ( A x. C ) = ( C x. A ) )
6	5	adantrr 479	. . . 4 |- ( ( A e. RR /\ ( C e. RR /\ 0 <_ C ) ) -> ( A x. C ) = ( C x. A ) )
7	6	3adant2 1040	. . 3 |- ( ( A e. RR /\ B e. RR /\ ( C e. RR /\ 0 <_ C ) ) -> ( A x. C ) = ( C x. A ) )
8	7	adantr 276	. 2 |- ( ( ( A e. RR /\ B e. RR /\ ( C e. RR /\ 0 <_ C ) ) /\ A <_ B ) -> ( A x. C ) = ( C x. A ) )
9		recn 8155	. . . . . 6 |- ( B e. RR -> B e. CC )
10		mulcom 8151	. . . . . 6 |- ( ( B e. CC /\ C e. CC ) -> ( B x. C ) = ( C x. B ) )
11	9, 3, 10	syl2an 289	. . . . 5 |- ( ( B e. RR /\ C e. RR ) -> ( B x. C ) = ( C x. B ) )
12	11	adantrr 479	. . . 4 |- ( ( B e. RR /\ ( C e. RR /\ 0 <_ C ) ) -> ( B x. C ) = ( C x. B ) )
13	12	3adant1 1039	. . 3 |- ( ( A e. RR /\ B e. RR /\ ( C e. RR /\ 0 <_ C ) ) -> ( B x. C ) = ( C x. B ) )
14	13	adantr 276	. 2 |- ( ( ( A e. RR /\ B e. RR /\ ( C e. RR /\ 0 <_ C ) ) /\ A <_ B ) -> ( B x. C ) = ( C x. B ) )
15	1, 8, 14	3brtr3d 4117	1 |- ( ( ( A e. RR /\ B e. RR /\ ( C e. RR /\ 0 <_ C ) ) /\ A <_ B ) -> ( C x. A ) <_ ( C x. B ) )

Syntax hints:   -> wi 4   /\ wa 104   /\ w3a 1002   = wceq 1395   e. wcel 2200   class class class wbr 4086  (class class class)co 6013   CCcc 8020   RRcr 8021   0cc0 8022   x. cmul 8027   <_ cle 8205

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 4205  ax-pow 4262  ax-pr 4297  ax-un 4528  ax-setind 4633  ax-cnex 8113  ax-resscn 8114  ax-1cn 8115  ax-1re 8116  ax-icn 8117  ax-addcl 8118  ax-addrcl 8119  ax-mulcl 8120  ax-mulrcl 8121  ax-addcom 8122  ax-mulcom 8123  ax-addass 8124  ax-mulass 8125  ax-distr 8126  ax-i2m1 8127  ax-0lt1 8128  ax-1rid 8129  ax-0id 8130  ax-rnegex 8131  ax-precex 8132  ax-cnre 8133  ax-pre-ltirr 8134  ax-pre-ltwlin 8135  ax-pre-lttrn 8136  ax-pre-apti 8137  ax-pre-ltadd 8138  ax-pre-mulgt0 8139  ax-pre-mulext 8140

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 2802  df-sbc 3030  df-dif 3200  df-un 3202  df-in 3204  df-ss 3211  df-pw 3652  df-sn 3673  df-pr 3674  df-op 3676  df-uni 3892  df-br 4087  df-opab 4149  df-id 4388  df-po 4391  df-iso 4392  df-xp 4729  df-rel 4730  df-cnv 4731  df-co 4732  df-dm 4733  df-iota 5284  df-fun 5326  df-fv 5332  df-riota 5966  df-ov 6016  df-oprab 6017  df-mpo 6018  df-pnf 8206  df-mnf 8207  df-xr 8208  df-ltxr 8209  df-le 8210  df-sub 8342  df-neg 8343  df-reap 8745  df-ap 8752

This theorem is referenced by:  lemul12b  9031  ledivp1  9073  lemul2ad  9110  facavg  10998  mulcn2  11863  cvgratnnlemnexp  12075  cvgratnnlemmn  12076  mertenslemi1  12086