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Theorem subneg 8565
Description: Relationship between subtraction and negative. (Contributed by NM, 10-May-2004.) (Revised by Mario Carneiro, 27-May-2016.)
Assertion
Ref Expression
subneg  |-  ( ( A  e.  CC  /\  B  e.  CC )  ->  ( A  -  -u B
)  =  ( A  +  B ) )

Proof of Theorem subneg
StepHypRef Expression
1 df-neg 8490 . . . 4  |-  -u B  =  ( 0  -  B )
21oveq2i 6086 . . 3  |-  ( A  -  -u B )  =  ( A  -  (
0  -  B ) )
3 0cn 8308 . . . 4  |-  0  e.  CC
4 subsub 8546 . . . 4  |-  ( ( A  e.  CC  /\  0  e.  CC  /\  B  e.  CC )  ->  ( A  -  ( 0  -  B ) )  =  ( ( A  -  0 )  +  B ) )
53, 4mp3an2 1366 . . 3  |-  ( ( A  e.  CC  /\  B  e.  CC )  ->  ( A  -  (
0  -  B ) )  =  ( ( A  -  0 )  +  B ) )
62, 5eqtrid 2283 . 2  |-  ( ( A  e.  CC  /\  B  e.  CC )  ->  ( A  -  -u B
)  =  ( ( A  -  0 )  +  B ) )
7 subid1 8536 . . . 4  |-  ( A  e.  CC  ->  ( A  -  0 )  =  A )
87adantr 276 . . 3  |-  ( ( A  e.  CC  /\  B  e.  CC )  ->  ( A  -  0 )  =  A )
98oveq1d 6090 . 2  |-  ( ( A  e.  CC  /\  B  e.  CC )  ->  ( ( A  - 
0 )  +  B
)  =  ( A  +  B ) )
106, 9eqtrd 2271 1  |-  ( ( A  e.  CC  /\  B  e.  CC )  ->  ( A  -  -u B
)  =  ( A  +  B ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    = wceq 1402    e. wcel 2209  (class class class)co 6075   CCcc 8167   0cc0 8169    + caddc 8172    - cmin 8487   -ucneg 8488
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 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4244  ax-pow 4306  ax-pr 4341  ax-setind 4679  ax-resscn 8261  ax-1cn 8262  ax-icn 8264  ax-addcl 8265  ax-addrcl 8266  ax-mulcl 8267  ax-addcom 8269  ax-addass 8271  ax-distr 8273  ax-i2m1 8274  ax-0id 8277  ax-rnegex 8278  ax-cnre 8280
This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-ral 2533  df-rex 2534  df-reu 2535  df-rab 2537  df-v 2823  df-sbc 3052  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-br 4126  df-opab 4188  df-id 4433  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-iota 5332  df-fun 5374  df-fv 5380  df-riota 6028  df-ov 6078  df-oprab 6079  df-mpo 6080  df-sub 8489  df-neg 8490
This theorem is referenced by:  negneg  8566  negdi  8573  neg2sub  8576  subnegi  8595  subnegd  8634  recextlem1  8969  fzshftral  10493  shftval4  11571  fsumshftm  12190  eftlub  12435  summodnegmod  12567  wilthlem1  16008
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