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Theorem subcand 8621
Description: Cancellation law for subtraction. (Contributed by Mario Carneiro, 27-May-2016.)
Hypotheses
Ref Expression
negidd.1  |-  ( ph  ->  A  e.  CC )
pncand.2  |-  ( ph  ->  B  e.  CC )
subaddd.3  |-  ( ph  ->  C  e.  CC )
subcand.4  |-  ( ph  ->  ( A  -  B
)  =  ( A  -  C ) )
Assertion
Ref Expression
subcand  |-  ( ph  ->  B  =  C )

Proof of Theorem subcand
StepHypRef Expression
1 subcand.4 . 2  |-  ( ph  ->  ( A  -  B
)  =  ( A  -  C ) )
2 negidd.1 . . 3  |-  ( ph  ->  A  e.  CC )
3 pncand.2 . . 3  |-  ( ph  ->  B  e.  CC )
4 subaddd.3 . . 3  |-  ( ph  ->  C  e.  CC )
5 subcan 8524 . . 3  |-  ( ( A  e.  CC  /\  B  e.  CC  /\  C  e.  CC )  ->  (
( A  -  B
)  =  ( A  -  C )  <->  B  =  C ) )
62, 3, 4, 5syl3anc 1274 . 2  |-  ( ph  ->  ( ( A  -  B )  =  ( A  -  C )  <-> 
B  =  C ) )
71, 6mpbid 147 1  |-  ( ph  ->  B  =  C )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 105    = wceq 1398    e. wcel 2203  (class class class)co 6049   CCcc 8121    - cmin 8440
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-14 2206  ax-ext 2214  ax-sep 4227  ax-pow 4286  ax-pr 4321  ax-setind 4658  ax-resscn 8215  ax-1cn 8216  ax-icn 8218  ax-addcl 8219  ax-addrcl 8220  ax-mulcl 8221  ax-addcom 8223  ax-addass 8225  ax-distr 8227  ax-i2m1 8228  ax-0id 8231  ax-rnegex 8232  ax-cnre 8234
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ne 2413  df-ral 2525  df-rex 2526  df-reu 2527  df-rab 2529  df-v 2814  df-sbc 3042  df-dif 3212  df-un 3214  df-in 3216  df-ss 3223  df-pw 3670  df-sn 3694  df-pr 3695  df-op 3697  df-uni 3914  df-br 4109  df-opab 4171  df-id 4413  df-xp 4754  df-rel 4755  df-cnv 4756  df-co 4757  df-dm 4758  df-iota 5311  df-fun 5353  df-fv 5359  df-riota 6002  df-ov 6052  df-oprab 6053  df-mpo 6054  df-sub 8442
This theorem is referenced by:  4sqlemffi  13087  gausslemma2dlem1f1o  15920
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