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Theorem xltneg 9793
Description: Extended real version of ltneg 8381. (Contributed by Mario Carneiro, 20-Aug-2015.)
Assertion
Ref Expression
xltneg  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  ( A  <  B  <->  -e B  <  -e A ) )

Proof of Theorem xltneg
StepHypRef Expression
1 xltnegi 9792 . . 3  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  A  < 
B )  ->  -e
B  <  -e A )
213expia 1200 . 2  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  ( A  <  B  ->  -e
B  <  -e A ) )
3 xnegcl 9789 . . . 4  |-  ( B  e.  RR*  ->  -e
B  e.  RR* )
4 xnegcl 9789 . . . 4  |-  ( A  e.  RR*  ->  -e
A  e.  RR* )
5 xltnegi 9792 . . . . 5  |-  ( ( 
-e B  e. 
RR*  /\  -e A  e.  RR*  /\  -e
B  <  -e A )  ->  -e  -e A  <  -e  -e B )
653expia 1200 . . . 4  |-  ( ( 
-e B  e. 
RR*  /\  -e A  e.  RR* )  ->  (  -e B  <  -e
A  ->  -e  -e A  <  -e  -e B ) )
73, 4, 6syl2anr 288 . . 3  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  (  -e B  <  -e
A  ->  -e  -e A  <  -e  -e B ) )
8 xnegneg 9790 . . . 4  |-  ( A  e.  RR*  ->  -e  -e A  =  A )
9 xnegneg 9790 . . . 4  |-  ( B  e.  RR*  ->  -e  -e B  =  B )
108, 9breqan12d 4005 . . 3  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  (  -e  -e A  <  -e  -e
B  <->  A  <  B ) )
117, 10sylibd 148 . 2  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  (  -e B  <  -e
A  ->  A  <  B ) )
122, 11impbid 128 1  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  ( A  <  B  <->  -e B  <  -e A ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    <-> wb 104    e. wcel 2141   class class class wbr 3989   RR*cxr 7953    < clt 7954    -ecxne 9726
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 609  ax-in2 610  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-13 2143  ax-14 2144  ax-ext 2152  ax-sep 4107  ax-pow 4160  ax-pr 4194  ax-un 4418  ax-setind 4521  ax-cnex 7865  ax-resscn 7866  ax-1cn 7867  ax-1re 7868  ax-icn 7869  ax-addcl 7870  ax-addrcl 7871  ax-mulcl 7872  ax-addcom 7874  ax-addass 7876  ax-distr 7878  ax-i2m1 7879  ax-0id 7882  ax-rnegex 7883  ax-cnre 7885  ax-pre-ltadd 7890
This theorem depends on definitions:  df-bi 116  df-3or 974  df-3an 975  df-tru 1351  df-fal 1354  df-nf 1454  df-sb 1756  df-eu 2022  df-mo 2023  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ne 2341  df-nel 2436  df-ral 2453  df-rex 2454  df-reu 2455  df-rab 2457  df-v 2732  df-sbc 2956  df-dif 3123  df-un 3125  df-in 3127  df-ss 3134  df-if 3527  df-pw 3568  df-sn 3589  df-pr 3590  df-op 3592  df-uni 3797  df-br 3990  df-opab 4051  df-id 4278  df-xp 4617  df-rel 4618  df-cnv 4619  df-co 4620  df-dm 4621  df-iota 5160  df-fun 5200  df-fv 5206  df-riota 5809  df-ov 5856  df-oprab 5857  df-mpo 5858  df-pnf 7956  df-mnf 7957  df-xr 7958  df-ltxr 7959  df-sub 8092  df-neg 8093  df-xneg 9729
This theorem is referenced by:  xleneg  9794  xlt0neg1  9795  xlt0neg2  9796  xrnegiso  11225  xrminmax  11228  xrltmininf  11233  xrminltinf  11235
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