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Theorem ltmul12a 9612
Description: Comparison of product of two positive numbers. (Contributed by NM, 30-Dec-2005.)
Assertion
Ref Expression
ltmul12a  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  (
0  <_  A  /\  A  <  B ) )  /\  ( ( C  e.  RR  /\  D  e.  RR )  /\  (
0  <_  C  /\  C  <  D ) ) )  ->  ( A  x.  C )  <  ( B  x.  D )
)

Proof of Theorem ltmul12a
StepHypRef Expression
1 simplll 734 . . . 4  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( ( 0  <_  A  /\  A  <  B
)  /\  ( 0  <_  C  /\  C  <  D ) ) )  ->  A  e.  RR )
2 simpllr 735 . . . 4  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( ( 0  <_  A  /\  A  <  B
)  /\  ( 0  <_  C  /\  C  <  D ) ) )  ->  B  e.  RR )
3 simpll 730 . . . . . 6  |-  ( ( ( C  e.  RR  /\  D  e.  RR )  /\  ( 0  <_  C  /\  C  <  D
) )  ->  C  e.  RR )
4 simprl 732 . . . . . 6  |-  ( ( ( C  e.  RR  /\  D  e.  RR )  /\  ( 0  <_  C  /\  C  <  D
) )  ->  0  <_  C )
53, 4jca 518 . . . . 5  |-  ( ( ( C  e.  RR  /\  D  e.  RR )  /\  ( 0  <_  C  /\  C  <  D
) )  ->  ( C  e.  RR  /\  0  <_  C ) )
65ad2ant2l 726 . . . 4  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( ( 0  <_  A  /\  A  <  B
)  /\  ( 0  <_  C  /\  C  <  D ) ) )  ->  ( C  e.  RR  /\  0  <_  C ) )
7 ltle 8910 . . . . . . 7  |-  ( ( A  e.  RR  /\  B  e.  RR )  ->  ( A  <  B  ->  A  <_  B )
)
87imp 418 . . . . . 6  |-  ( ( ( A  e.  RR  /\  B  e.  RR )  /\  A  <  B
)  ->  A  <_  B )
98adantrl 696 . . . . 5  |-  ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( 0  <_  A  /\  A  <  B
) )  ->  A  <_  B )
109ad2ant2r 727 . . . 4  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( ( 0  <_  A  /\  A  <  B
)  /\  ( 0  <_  C  /\  C  <  D ) ) )  ->  A  <_  B
)
11 lemul1a 9610 . . . 4  |-  ( ( ( A  e.  RR  /\  B  e.  RR  /\  ( C  e.  RR  /\  0  <_  C )
)  /\  A  <_  B )  ->  ( A  x.  C )  <_  ( B  x.  C )
)
121, 2, 6, 10, 11syl31anc 1185 . . 3  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( ( 0  <_  A  /\  A  <  B
)  /\  ( 0  <_  C  /\  C  <  D ) ) )  ->  ( A  x.  C )  <_  ( B  x.  C )
)
13 simplrl 736 . . . . . . 7  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( 0  <_  A  /\  A  <  B ) )  ->  C  e.  RR )
14 simplrr 737 . . . . . . 7  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( 0  <_  A  /\  A  <  B ) )  ->  D  e.  RR )
15 simpllr 735 . . . . . . 7  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( 0  <_  A  /\  A  <  B ) )  ->  B  e.  RR )
16 0re 8838 . . . . . . . . . 10  |-  0  e.  RR
17 lelttr 8912 . . . . . . . . . 10  |-  ( ( 0  e.  RR  /\  A  e.  RR  /\  B  e.  RR )  ->  (
( 0  <_  A  /\  A  <  B )  ->  0  <  B
) )
1816, 17mp3an1 1264 . . . . . . . . 9  |-  ( ( A  e.  RR  /\  B  e.  RR )  ->  ( ( 0  <_  A  /\  A  <  B
)  ->  0  <  B ) )
1918imp 418 . . . . . . . 8  |-  ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( 0  <_  A  /\  A  <  B
) )  ->  0  <  B )
2019adantlr 695 . . . . . . 7  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( 0  <_  A  /\  A  <  B ) )  ->  0  <  B )
21 ltmul2 9607 . . . . . . 7  |-  ( ( C  e.  RR  /\  D  e.  RR  /\  ( B  e.  RR  /\  0  <  B ) )  -> 
( C  <  D  <->  ( B  x.  C )  <  ( B  x.  D ) ) )
2213, 14, 15, 20, 21syl112anc 1186 . . . . . 6  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( 0  <_  A  /\  A  <  B ) )  ->  ( C  <  D  <->  ( B  x.  C )  <  ( B  x.  D )
) )
2322biimpa 470 . . . . 5  |-  ( ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( 0  <_  A  /\  A  <  B ) )  /\  C  < 
D )  ->  ( B  x.  C )  <  ( B  x.  D
) )
2423anasss 628 . . . 4  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( ( 0  <_  A  /\  A  <  B
)  /\  C  <  D ) )  ->  ( B  x.  C )  <  ( B  x.  D
) )
2524adantrrl 704 . . 3  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( ( 0  <_  A  /\  A  <  B
)  /\  ( 0  <_  C  /\  C  <  D ) ) )  ->  ( B  x.  C )  <  ( B  x.  D )
)
26 remulcl 8822 . . . . . 6  |-  ( ( A  e.  RR  /\  C  e.  RR )  ->  ( A  x.  C
)  e.  RR )
2726ad2ant2r 727 . . . . 5  |-  ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  -> 
( A  x.  C
)  e.  RR )
28 remulcl 8822 . . . . . 6  |-  ( ( B  e.  RR  /\  C  e.  RR )  ->  ( B  x.  C
)  e.  RR )
2928ad2ant2lr 728 . . . . 5  |-  ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  -> 
( B  x.  C
)  e.  RR )
30 remulcl 8822 . . . . . 6  |-  ( ( B  e.  RR  /\  D  e.  RR )  ->  ( B  x.  D
)  e.  RR )
3130ad2ant2l 726 . . . . 5  |-  ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  -> 
( B  x.  D
)  e.  RR )
32 lelttr 8912 . . . . 5  |-  ( ( ( A  x.  C
)  e.  RR  /\  ( B  x.  C
)  e.  RR  /\  ( B  x.  D
)  e.  RR )  ->  ( ( ( A  x.  C )  <_  ( B  x.  C )  /\  ( B  x.  C )  <  ( B  x.  D
) )  ->  ( A  x.  C )  <  ( B  x.  D
) ) )
3327, 29, 31, 32syl3anc 1182 . . . 4  |-  ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  -> 
( ( ( A  x.  C )  <_ 
( B  x.  C
)  /\  ( B  x.  C )  <  ( B  x.  D )
)  ->  ( A  x.  C )  <  ( B  x.  D )
) )
3433adantr 451 . . 3  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( ( 0  <_  A  /\  A  <  B
)  /\  ( 0  <_  C  /\  C  <  D ) ) )  ->  ( ( ( A  x.  C )  <_  ( B  x.  C )  /\  ( B  x.  C )  <  ( B  x.  D
) )  ->  ( A  x.  C )  <  ( B  x.  D
) ) )
3512, 25, 34mp2and 660 . 2  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( ( 0  <_  A  /\  A  <  B
)  /\  ( 0  <_  C  /\  C  <  D ) ) )  ->  ( A  x.  C )  <  ( B  x.  D )
)
3635an4s 799 1  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  (
0  <_  A  /\  A  <  B ) )  /\  ( ( C  e.  RR  /\  D  e.  RR )  /\  (
0  <_  C  /\  C  <  D ) ) )  ->  ( A  x.  C )  <  ( B  x.  D )
)
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 176    /\ wa 358    e. wcel 1684   class class class wbr 4023  (class class class)co 5858   RRcr 8736   0cc0 8737    x. cmul 8742    < clt 8867    <_ cle 8868
This theorem is referenced by:  ltmul12ad  9698  expmordi  27032  stoweidlem3  27752
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-13 1686  ax-14 1688  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866  ax-ext 2264  ax-sep 4141  ax-nul 4149  ax-pow 4188  ax-pr 4214  ax-un 4512  ax-resscn 8794  ax-1cn 8795  ax-icn 8796  ax-addcl 8797  ax-addrcl 8798  ax-mulcl 8799  ax-mulrcl 8800  ax-mulcom 8801  ax-addass 8802  ax-mulass 8803  ax-distr 8804  ax-i2m1 8805  ax-1ne0 8806  ax-1rid 8807  ax-rnegex 8808  ax-rrecex 8809  ax-cnre 8810  ax-pre-lttri 8811  ax-pre-lttrn 8812  ax-pre-ltadd 8813  ax-pre-mulgt0 8814
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-tru 1310  df-ex 1529  df-nf 1532  df-sb 1630  df-eu 2147  df-mo 2148  df-clab 2270  df-cleq 2276  df-clel 2279  df-nfc 2408  df-ne 2448  df-nel 2449  df-ral 2548  df-rex 2549  df-reu 2550  df-rab 2552  df-v 2790  df-sbc 2992  df-csb 3082  df-dif 3155  df-un 3157  df-in 3159  df-ss 3166  df-nul 3456  df-if 3566  df-pw 3627  df-sn 3646  df-pr 3647  df-op 3649  df-uni 3828  df-br 4024  df-opab 4078  df-mpt 4079  df-id 4309  df-po 4314  df-so 4315  df-xp 4695  df-rel 4696  df-cnv 4697  df-co 4698  df-dm 4699  df-rn 4700  df-res 4701  df-ima 4702  df-iota 5219  df-fun 5257  df-fn 5258  df-f 5259  df-f1 5260  df-fo 5261  df-f1o 5262  df-fv 5263  df-ov 5861  df-oprab 5862  df-mpt2 5863  df-riota 6304  df-er 6660  df-en 6864  df-dom 6865  df-sdom 6866  df-pnf 8869  df-mnf 8870  df-xr 8871  df-ltxr 8872  df-le 8873  df-sub 9039  df-neg 9040
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