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Theorem subneintrd 8117
Description: Introducing subtraction on both sides of a statement of inequality. Contrapositive of subcand 8114. (Contributed by David Moews, 28-Feb-2017.)
Hypotheses
Ref Expression
negidd.1  |-  ( ph  ->  A  e.  CC )
pncand.2  |-  ( ph  ->  B  e.  CC )
subaddd.3  |-  ( ph  ->  C  e.  CC )
subneintrd.4  |-  ( ph  ->  B  =/=  C )
Assertion
Ref Expression
subneintrd  |-  ( ph  ->  ( A  -  B
)  =/=  ( A  -  C ) )

Proof of Theorem subneintrd
StepHypRef Expression
1 subneintrd.4 . 2  |-  ( ph  ->  B  =/=  C )
2 negidd.1 . . . 4  |-  ( ph  ->  A  e.  CC )
3 pncand.2 . . . 4  |-  ( ph  ->  B  e.  CC )
4 subaddd.3 . . . 4  |-  ( ph  ->  C  e.  CC )
52, 3, 4subcanad 8116 . . 3  |-  ( ph  ->  ( ( A  -  B )  =  ( A  -  C )  <-> 
B  =  C ) )
65necon3bid 2349 . 2  |-  ( ph  ->  ( ( A  -  B )  =/=  ( A  -  C )  <->  B  =/=  C ) )
71, 6mpbird 166 1  |-  ( ph  ->  ( A  -  B
)  =/=  ( A  -  C ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    e. wcel 1480    =/= wne 2308  (class class class)co 5774   CCcc 7618    - cmin 7933
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 603  ax-in2 604  ax-io 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-14 1492  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2121  ax-sep 4046  ax-pow 4098  ax-pr 4131  ax-setind 4452  ax-resscn 7712  ax-1cn 7713  ax-icn 7715  ax-addcl 7716  ax-addrcl 7717  ax-mulcl 7718  ax-addcom 7720  ax-addass 7722  ax-distr 7724  ax-i2m1 7725  ax-0id 7728  ax-rnegex 7729  ax-cnre 7731
This theorem depends on definitions:  df-bi 116  df-3an 964  df-tru 1334  df-fal 1337  df-nf 1437  df-sb 1736  df-eu 2002  df-mo 2003  df-clab 2126  df-cleq 2132  df-clel 2135  df-nfc 2270  df-ne 2309  df-ral 2421  df-rex 2422  df-reu 2423  df-rab 2425  df-v 2688  df-sbc 2910  df-dif 3073  df-un 3075  df-in 3077  df-ss 3084  df-pw 3512  df-sn 3533  df-pr 3534  df-op 3536  df-uni 3737  df-br 3930  df-opab 3990  df-id 4215  df-xp 4545  df-rel 4546  df-cnv 4547  df-co 4548  df-dm 4549  df-iota 5088  df-fun 5125  df-fv 5131  df-riota 5730  df-ov 5777  df-oprab 5778  df-mpo 5779  df-sub 7935
This theorem is referenced by: (None)
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