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Theorem subneg 8428
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 8353 . . . 4  |-  -u B  =  ( 0  -  B )
21oveq2i 6029 . . 3  |-  ( A  -  -u B )  =  ( A  -  (
0  -  B ) )
3 0cn 8171 . . . 4  |-  0  e.  CC
4 subsub 8409 . . . 4  |-  ( ( A  e.  CC  /\  0  e.  CC  /\  B  e.  CC )  ->  ( A  -  ( 0  -  B ) )  =  ( ( A  -  0 )  +  B ) )
53, 4mp3an2 1361 . . 3  |-  ( ( A  e.  CC  /\  B  e.  CC )  ->  ( A  -  (
0  -  B ) )  =  ( ( A  -  0 )  +  B ) )
62, 5eqtrid 2276 . 2  |-  ( ( A  e.  CC  /\  B  e.  CC )  ->  ( A  -  -u B
)  =  ( ( A  -  0 )  +  B ) )
7 subid1 8399 . . . 4  |-  ( A  e.  CC  ->  ( A  -  0 )  =  A )
87adantr 276 . . 3  |-  ( ( A  e.  CC  /\  B  e.  CC )  ->  ( A  -  0 )  =  A )
98oveq1d 6033 . 2  |-  ( ( A  e.  CC  /\  B  e.  CC )  ->  ( ( A  - 
0 )  +  B
)  =  ( A  +  B ) )
106, 9eqtrd 2264 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 1397    e. wcel 2202  (class class class)co 6018   CCcc 8030   0cc0 8032    + caddc 8035    - cmin 8350   -ucneg 8351
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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-setind 4635  ax-resscn 8124  ax-1cn 8125  ax-icn 8127  ax-addcl 8128  ax-addrcl 8129  ax-mulcl 8130  ax-addcom 8132  ax-addass 8134  ax-distr 8136  ax-i2m1 8137  ax-0id 8140  ax-rnegex 8141  ax-cnre 8143
This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-ral 2515  df-rex 2516  df-reu 2517  df-rab 2519  df-v 2804  df-sbc 3032  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-br 4089  df-opab 4151  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-iota 5286  df-fun 5328  df-fv 5334  df-riota 5971  df-ov 6021  df-oprab 6022  df-mpo 6023  df-sub 8352  df-neg 8353
This theorem is referenced by:  negneg  8429  negdi  8436  neg2sub  8439  subnegi  8458  subnegd  8497  recextlem1  8831  fzshftral  10343  shftval4  11406  fsumshftm  12024  eftlub  12269  summodnegmod  12401  wilthlem1  15723
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