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Theorem ltne 9670
Description: 'Less than' implies not equal. (Contributed by NM, 9-Oct-1999.) (Revised by Mario Carneiro, 16-Sep-2015.)
Assertion
Ref Expression
ltne  |-  ( ( A  e.  RR  /\  A  <  B )  ->  B  =/=  A )

Proof of Theorem ltne
StepHypRef Expression
1 ltnr 9668 . . . 4  |-  ( A  e.  RR  ->  -.  A  <  A )
2 breq2 4443 . . . . 5  |-  ( B  =  A  ->  ( A  <  B  <->  A  <  A ) )
32notbid 292 . . . 4  |-  ( B  =  A  ->  ( -.  A  <  B  <->  -.  A  <  A ) )
41, 3syl5ibrcom 222 . . 3  |-  ( A  e.  RR  ->  ( B  =  A  ->  -.  A  <  B ) )
54necon2ad 2667 . 2  |-  ( A  e.  RR  ->  ( A  <  B  ->  B  =/=  A ) )
65imp 427 1  |-  ( ( A  e.  RR  /\  A  <  B )  ->  B  =/=  A )
Colors of variables: wff setvar class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 367    = wceq 1398    e. wcel 1823    =/= wne 2649   class class class wbr 4439   RRcr 9480    < clt 9617
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1623  ax-4 1636  ax-5 1709  ax-6 1752  ax-7 1795  ax-8 1825  ax-9 1827  ax-10 1842  ax-11 1847  ax-12 1859  ax-13 2004  ax-ext 2432  ax-sep 4560  ax-nul 4568  ax-pow 4615  ax-pr 4676  ax-un 6565  ax-resscn 9538  ax-pre-lttri 9555  ax-pre-lttrn 9556
This theorem depends on definitions:  df-bi 185  df-or 368  df-an 369  df-3or 972  df-3an 973  df-tru 1401  df-ex 1618  df-nf 1622  df-sb 1745  df-eu 2288  df-mo 2289  df-clab 2440  df-cleq 2446  df-clel 2449  df-nfc 2604  df-ne 2651  df-nel 2652  df-ral 2809  df-rex 2810  df-rab 2813  df-v 3108  df-sbc 3325  df-csb 3421  df-dif 3464  df-un 3466  df-in 3468  df-ss 3475  df-nul 3784  df-if 3930  df-pw 4001  df-sn 4017  df-pr 4019  df-op 4023  df-uni 4236  df-br 4440  df-opab 4498  df-mpt 4499  df-id 4784  df-po 4789  df-so 4790  df-xp 4994  df-rel 4995  df-cnv 4996  df-co 4997  df-dm 4998  df-rn 4999  df-res 5000  df-ima 5001  df-iota 5534  df-fun 5572  df-fn 5573  df-f 5574  df-f1 5575  df-fo 5576  df-f1o 5577  df-fv 5578  df-er 7303  df-en 7510  df-dom 7511  df-sdom 7512  df-pnf 9619  df-mnf 9620  df-ltxr 9622
This theorem is referenced by:  ltneOLD  9671  gtneii  9685  ltnei  9697  gtned  9709  gt0ne0  10013  lt0ne0  10014  gt0ne0d  10113  cshwshashlem1  14664  chfacffsupp  19524  chfacfscmul0  19526  chfacfscmulgsum  19528  chfacfpmmul0  19530  chfacfpmmulgsum  19532  axlowdimlem16  24462  nvnencycllem  24845  frgraogt3nreg  25322  staddi  27363  tan2h  30287  ftc1cnnc  30329  fdc  30478  sineq0ALT  34138
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