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Theorem xrltne 10092
Description: 'Less than' implies not equal for extended reals. (Contributed by NM, 20-Jan-2006.)
Assertion
Ref Expression
xrltne  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  A  < 
B )  ->  B  =/=  A )

Proof of Theorem xrltne
StepHypRef Expression
1 xrltnr 10058 . . . . 5  |-  ( A  e.  RR*  ->  -.  A  <  A )
2 breq2 4097 . . . . . 6  |-  ( B  =  A  ->  ( A  <  B  <->  A  <  A ) )
32notbid 673 . . . . 5  |-  ( B  =  A  ->  ( -.  A  <  B  <->  -.  A  <  A ) )
41, 3syl5ibrcom 157 . . . 4  |-  ( A  e.  RR*  ->  ( B  =  A  ->  -.  A  <  B ) )
54necon2ad 2460 . . 3  |-  ( A  e.  RR*  ->  ( A  <  B  ->  B  =/=  A ) )
65imp 124 . 2  |-  ( ( A  e.  RR*  /\  A  <  B )  ->  B  =/=  A )
763adant2 1043 1  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  A  < 
B )  ->  B  =/=  A )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ w3a 1005    = wceq 1398    e. wcel 2202    =/= wne 2403   class class class wbr 4093   RR*cxr 8255    < clt 8256
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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4212  ax-pow 4270  ax-pr 4305  ax-un 4536  ax-setind 4641  ax-cnex 8166  ax-resscn 8167  ax-pre-ltirr 8187
This theorem depends on definitions:  df-bi 117  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ne 2404  df-nel 2499  df-ral 2516  df-rex 2517  df-rab 2520  df-v 2805  df-dif 3203  df-un 3205  df-in 3207  df-ss 3214  df-pw 3658  df-sn 3679  df-pr 3680  df-op 3682  df-uni 3899  df-br 4094  df-opab 4156  df-xp 4737  df-pnf 8258  df-mnf 8259  df-xr 8260  df-ltxr 8261
This theorem is referenced by: (None)
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