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Theorem subneintr2d 9421
Description: Introducing subtraction on both sides of a statement of nonequality. Contrapositive of subcan2d 9417. (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 )
subneintr2d.4  |-  ( ph  ->  A  =/=  B )
Assertion
Ref Expression
subneintr2d  |-  ( ph  ->  ( A  -  C
)  =/=  ( B  -  C ) )

Proof of Theorem subneintr2d
StepHypRef Expression
1 subneintr2d.4 . 2  |-  ( ph  ->  A  =/=  B )
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, 4subcan2ad 9420 . . 3  |-  ( ph  ->  ( ( A  -  C )  =  ( B  -  C )  <-> 
A  =  B ) )
65necon3bid 2610 . 2  |-  ( ph  ->  ( ( A  -  C )  =/=  ( B  -  C )  <->  A  =/=  B ) )
71, 6mpbird 224 1  |-  ( ph  ->  ( A  -  C
)  =/=  ( B  -  C ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    e. wcel 1721    =/= wne 2575  (class class class)co 6048   CCcc 8952    - cmin 9255
This theorem is referenced by:  ang180  20617  angpieqvdlem  20630
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1552  ax-5 1563  ax-17 1623  ax-9 1662  ax-8 1683  ax-13 1723  ax-14 1725  ax-6 1740  ax-7 1745  ax-11 1757  ax-12 1946  ax-ext 2393  ax-sep 4298  ax-nul 4306  ax-pow 4345  ax-pr 4371  ax-un 4668  ax-resscn 9011  ax-1cn 9012  ax-icn 9013  ax-addcl 9014  ax-addrcl 9015  ax-mulcl 9016  ax-mulrcl 9017  ax-mulcom 9018  ax-addass 9019  ax-mulass 9020  ax-distr 9021  ax-i2m1 9022  ax-1ne0 9023  ax-1rid 9024  ax-rnegex 9025  ax-rrecex 9026  ax-cnre 9027  ax-pre-lttri 9028  ax-pre-lttrn 9029  ax-pre-ltadd 9030
This theorem depends on definitions:  df-bi 178  df-or 360  df-an 361  df-3or 937  df-3an 938  df-tru 1325  df-ex 1548  df-nf 1551  df-sb 1656  df-eu 2266  df-mo 2267  df-clab 2399  df-cleq 2405  df-clel 2408  df-nfc 2537  df-ne 2577  df-nel 2578  df-ral 2679  df-rex 2680  df-reu 2681  df-rab 2683  df-v 2926  df-sbc 3130  df-csb 3220  df-dif 3291  df-un 3293  df-in 3295  df-ss 3302  df-nul 3597  df-if 3708  df-pw 3769  df-sn 3788  df-pr 3789  df-op 3791  df-uni 3984  df-br 4181  df-opab 4235  df-mpt 4236  df-id 4466  df-po 4471  df-so 4472  df-xp 4851  df-rel 4852  df-cnv 4853  df-co 4854  df-dm 4855  df-rn 4856  df-res 4857  df-ima 4858  df-iota 5385  df-fun 5423  df-fn 5424  df-f 5425  df-f1 5426  df-fo 5427  df-f1o 5428  df-fv 5429  df-ov 6051  df-oprab 6052  df-mpt2 6053  df-riota 6516  df-er 6872  df-en 7077  df-dom 7078  df-sdom 7079  df-pnf 9086  df-mnf 9087  df-ltxr 9089  df-sub 9257
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