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Theorem lt0ne0d 7614
Description: Something less than zero is not zero. Deduction form. (Contributed by David Moews, 28-Feb-2017.)
Hypothesis
Ref Expression
lt0ne0d.1  |-  ( ph  ->  A  <  0 )
Assertion
Ref Expression
lt0ne0d  |-  ( ph  ->  A  =/=  0 )

Proof of Theorem lt0ne0d
StepHypRef Expression
1 lt0ne0d.1 . 2  |-  ( ph  ->  A  <  0 )
2 0re 7119 . . . . 5  |-  0  e.  RR
32ltnri 7203 . . . 4  |-  -.  0  <  0
4 breq1 3788 . . . 4  |-  ( A  =  0  ->  ( A  <  0  <->  0  <  0 ) )
53, 4mtbiri 632 . . 3  |-  ( A  =  0  ->  -.  A  <  0 )
65necon2ai 2299 . 2  |-  ( A  <  0  ->  A  =/=  0 )
71, 6syl 14 1  |-  ( ph  ->  A  =/=  0 )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1284    =/= wne 2245   class class class wbr 3785   0cc0 6981    < clt 7153
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-in1 576  ax-in2 577  ax-io 662  ax-5 1376  ax-7 1377  ax-gen 1378  ax-ie1 1422  ax-ie2 1423  ax-8 1435  ax-10 1436  ax-11 1437  ax-i12 1438  ax-bndl 1439  ax-4 1440  ax-13 1444  ax-14 1445  ax-17 1459  ax-i9 1463  ax-ial 1467  ax-i5r 1468  ax-ext 2063  ax-sep 3896  ax-pow 3948  ax-pr 3964  ax-un 4188  ax-setind 4280  ax-cnex 7067  ax-resscn 7068  ax-1re 7070  ax-addrcl 7073  ax-rnegex 7085  ax-pre-ltirr 7088
This theorem depends on definitions:  df-bi 115  df-3an 921  df-tru 1287  df-fal 1290  df-nf 1390  df-sb 1686  df-eu 1944  df-mo 1945  df-clab 2068  df-cleq 2074  df-clel 2077  df-nfc 2208  df-ne 2246  df-nel 2340  df-ral 2353  df-rex 2354  df-rab 2357  df-v 2603  df-dif 2975  df-un 2977  df-in 2979  df-ss 2986  df-pw 3384  df-sn 3404  df-pr 3405  df-op 3407  df-uni 3602  df-br 3786  df-opab 3840  df-xp 4369  df-pnf 7155  df-mnf 7156  df-ltxr 7158
This theorem is referenced by:  divalglemeuneg  10323
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