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Theorem modgcd 13036
Description: The gcd remains unchanged if one operand is replaced with its remainder modulo the other. (Contributed by Paul Chapman, 31-Mar-2011.)
Assertion
Ref Expression
modgcd  |-  ( ( M  e.  ZZ  /\  N  e.  NN )  ->  ( ( M  mod  N )  gcd  N )  =  ( M  gcd  N ) )

Proof of Theorem modgcd
StepHypRef Expression
1 zre 10286 . . . . . 6  |-  ( M  e.  ZZ  ->  M  e.  RR )
2 nnrp 10621 . . . . . 6  |-  ( N  e.  NN  ->  N  e.  RR+ )
3 modval 11252 . . . . . 6  |-  ( ( M  e.  RR  /\  N  e.  RR+ )  -> 
( M  mod  N
)  =  ( M  -  ( N  x.  ( |_ `  ( M  /  N ) ) ) ) )
41, 2, 3syl2an 464 . . . . 5  |-  ( ( M  e.  ZZ  /\  N  e.  NN )  ->  ( M  mod  N
)  =  ( M  -  ( N  x.  ( |_ `  ( M  /  N ) ) ) ) )
5 zcn 10287 . . . . . . 7  |-  ( M  e.  ZZ  ->  M  e.  CC )
65adantr 452 . . . . . 6  |-  ( ( M  e.  ZZ  /\  N  e.  NN )  ->  M  e.  CC )
7 nncn 10008 . . . . . . 7  |-  ( N  e.  NN  ->  N  e.  CC )
87adantl 453 . . . . . 6  |-  ( ( M  e.  ZZ  /\  N  e.  NN )  ->  N  e.  CC )
9 nnre 10007 . . . . . . . . . 10  |-  ( N  e.  NN  ->  N  e.  RR )
10 nnne0 10032 . . . . . . . . . 10  |-  ( N  e.  NN  ->  N  =/=  0 )
11 redivcl 9733 . . . . . . . . . 10  |-  ( ( M  e.  RR  /\  N  e.  RR  /\  N  =/=  0 )  ->  ( M  /  N )  e.  RR )
121, 9, 10, 11syl3an 1226 . . . . . . . . 9  |-  ( ( M  e.  ZZ  /\  N  e.  NN  /\  N  e.  NN )  ->  ( M  /  N )  e.  RR )
13123anidm23 1243 . . . . . . . 8  |-  ( ( M  e.  ZZ  /\  N  e.  NN )  ->  ( M  /  N
)  e.  RR )
1413flcld 11207 . . . . . . 7  |-  ( ( M  e.  ZZ  /\  N  e.  NN )  ->  ( |_ `  ( M  /  N ) )  e.  ZZ )
1514zcnd 10376 . . . . . 6  |-  ( ( M  e.  ZZ  /\  N  e.  NN )  ->  ( |_ `  ( M  /  N ) )  e.  CC )
16 mulneg1 9470 . . . . . . . . . . 11  |-  ( ( ( |_ `  ( M  /  N ) )  e.  CC  /\  N  e.  CC )  ->  ( -u ( |_ `  ( M  /  N ) )  x.  N )  = 
-u ( ( |_
`  ( M  /  N ) )  x.  N ) )
17 mulcom 9076 . . . . . . . . . . . 12  |-  ( ( ( |_ `  ( M  /  N ) )  e.  CC  /\  N  e.  CC )  ->  (
( |_ `  ( M  /  N ) )  x.  N )  =  ( N  x.  ( |_ `  ( M  /  N ) ) ) )
1817negeqd 9300 . . . . . . . . . . 11  |-  ( ( ( |_ `  ( M  /  N ) )  e.  CC  /\  N  e.  CC )  ->  -u (
( |_ `  ( M  /  N ) )  x.  N )  = 
-u ( N  x.  ( |_ `  ( M  /  N ) ) ) )
1916, 18eqtrd 2468 . . . . . . . . . 10  |-  ( ( ( |_ `  ( M  /  N ) )  e.  CC  /\  N  e.  CC )  ->  ( -u ( |_ `  ( M  /  N ) )  x.  N )  = 
-u ( N  x.  ( |_ `  ( M  /  N ) ) ) )
2019ancoms 440 . . . . . . . . 9  |-  ( ( N  e.  CC  /\  ( |_ `  ( M  /  N ) )  e.  CC )  -> 
( -u ( |_ `  ( M  /  N
) )  x.  N
)  =  -u ( N  x.  ( |_ `  ( M  /  N
) ) ) )
21203adant1 975 . . . . . . . 8  |-  ( ( M  e.  CC  /\  N  e.  CC  /\  ( |_ `  ( M  /  N ) )  e.  CC )  ->  ( -u ( |_ `  ( M  /  N ) )  x.  N )  = 
-u ( N  x.  ( |_ `  ( M  /  N ) ) ) )
2221oveq2d 6097 . . . . . . 7  |-  ( ( M  e.  CC  /\  N  e.  CC  /\  ( |_ `  ( M  /  N ) )  e.  CC )  ->  ( M  +  ( -u ( |_ `  ( M  /  N ) )  x.  N ) )  =  ( M  +  -u ( N  x.  ( |_ `  ( M  /  N ) ) ) ) )
23 mulcl 9074 . . . . . . . . 9  |-  ( ( N  e.  CC  /\  ( |_ `  ( M  /  N ) )  e.  CC )  -> 
( N  x.  ( |_ `  ( M  /  N ) ) )  e.  CC )
24 negsub 9349 . . . . . . . . 9  |-  ( ( M  e.  CC  /\  ( N  x.  ( |_ `  ( M  /  N ) ) )  e.  CC )  -> 
( M  +  -u ( N  x.  ( |_ `  ( M  /  N ) ) ) )  =  ( M  -  ( N  x.  ( |_ `  ( M  /  N ) ) ) ) )
2523, 24sylan2 461 . . . . . . . 8  |-  ( ( M  e.  CC  /\  ( N  e.  CC  /\  ( |_ `  ( M  /  N ) )  e.  CC ) )  ->  ( M  +  -u ( N  x.  ( |_ `  ( M  /  N ) ) ) )  =  ( M  -  ( N  x.  ( |_ `  ( M  /  N ) ) ) ) )
26253impb 1149 . . . . . . 7  |-  ( ( M  e.  CC  /\  N  e.  CC  /\  ( |_ `  ( M  /  N ) )  e.  CC )  ->  ( M  +  -u ( N  x.  ( |_ `  ( M  /  N
) ) ) )  =  ( M  -  ( N  x.  ( |_ `  ( M  /  N ) ) ) ) )
2722, 26eqtrd 2468 . . . . . 6  |-  ( ( M  e.  CC  /\  N  e.  CC  /\  ( |_ `  ( M  /  N ) )  e.  CC )  ->  ( M  +  ( -u ( |_ `  ( M  /  N ) )  x.  N ) )  =  ( M  -  ( N  x.  ( |_ `  ( M  /  N
) ) ) ) )
286, 8, 15, 27syl3anc 1184 . . . . 5  |-  ( ( M  e.  ZZ  /\  N  e.  NN )  ->  ( M  +  (
-u ( |_ `  ( M  /  N
) )  x.  N
) )  =  ( M  -  ( N  x.  ( |_ `  ( M  /  N
) ) ) ) )
294, 28eqtr4d 2471 . . . 4  |-  ( ( M  e.  ZZ  /\  N  e.  NN )  ->  ( M  mod  N
)  =  ( M  +  ( -u ( |_ `  ( M  /  N ) )  x.  N ) ) )
3029oveq2d 6097 . . 3  |-  ( ( M  e.  ZZ  /\  N  e.  NN )  ->  ( N  gcd  ( M  mod  N ) )  =  ( N  gcd  ( M  +  ( -u ( |_ `  ( M  /  N ) )  x.  N ) ) ) )
3114znegcld 10377 . . . 4  |-  ( ( M  e.  ZZ  /\  N  e.  NN )  -> 
-u ( |_ `  ( M  /  N
) )  e.  ZZ )
32 nnz 10303 . . . . 5  |-  ( N  e.  NN  ->  N  e.  ZZ )
3332adantl 453 . . . 4  |-  ( ( M  e.  ZZ  /\  N  e.  NN )  ->  N  e.  ZZ )
34 simpl 444 . . . 4  |-  ( ( M  e.  ZZ  /\  N  e.  NN )  ->  M  e.  ZZ )
35 gcdaddm 13029 . . . 4  |-  ( (
-u ( |_ `  ( M  /  N
) )  e.  ZZ  /\  N  e.  ZZ  /\  M  e.  ZZ )  ->  ( N  gcd  M
)  =  ( N  gcd  ( M  +  ( -u ( |_ `  ( M  /  N
) )  x.  N
) ) ) )
3631, 33, 34, 35syl3anc 1184 . . 3  |-  ( ( M  e.  ZZ  /\  N  e.  NN )  ->  ( N  gcd  M
)  =  ( N  gcd  ( M  +  ( -u ( |_ `  ( M  /  N
) )  x.  N
) ) ) )
3730, 36eqtr4d 2471 . 2  |-  ( ( M  e.  ZZ  /\  N  e.  NN )  ->  ( N  gcd  ( M  mod  N ) )  =  ( N  gcd  M ) )
38 zmodcl 11266 . . . 4  |-  ( ( M  e.  ZZ  /\  N  e.  NN )  ->  ( M  mod  N
)  e.  NN0 )
3938nn0zd 10373 . . 3  |-  ( ( M  e.  ZZ  /\  N  e.  NN )  ->  ( M  mod  N
)  e.  ZZ )
40 gcdcom 13020 . . 3  |-  ( ( N  e.  ZZ  /\  ( M  mod  N )  e.  ZZ )  -> 
( N  gcd  ( M  mod  N ) )  =  ( ( M  mod  N )  gcd 
N ) )
4133, 39, 40syl2anc 643 . 2  |-  ( ( M  e.  ZZ  /\  N  e.  NN )  ->  ( N  gcd  ( M  mod  N ) )  =  ( ( M  mod  N )  gcd 
N ) )
42 gcdcom 13020 . . 3  |-  ( ( N  e.  ZZ  /\  M  e.  ZZ )  ->  ( N  gcd  M
)  =  ( M  gcd  N ) )
4333, 34, 42syl2anc 643 . 2  |-  ( ( M  e.  ZZ  /\  N  e.  NN )  ->  ( N  gcd  M
)  =  ( M  gcd  N ) )
4437, 41, 433eqtr3d 2476 1  |-  ( ( M  e.  ZZ  /\  N  e.  NN )  ->  ( ( M  mod  N )  gcd  N )  =  ( M  gcd  N ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 359    /\ w3a 936    = wceq 1652    e. wcel 1725    =/= wne 2599   ` cfv 5454  (class class class)co 6081   CCcc 8988   RRcr 8989   0cc0 8990    + caddc 8993    x. cmul 8995    - cmin 9291   -ucneg 9292    / cdiv 9677   NNcn 10000   ZZcz 10282   RR+crp 10612   |_cfl 11201    mod cmo 11250    gcd cgcd 13006
This theorem is referenced by:  eucalginv  13075  phimullem  13168  eulerthlem1  13170  pockthlem  13273  gcdmodi  13410
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1555  ax-5 1566  ax-17 1626  ax-9 1666  ax-8 1687  ax-13 1727  ax-14 1729  ax-6 1744  ax-7 1749  ax-11 1761  ax-12 1950  ax-ext 2417  ax-sep 4330  ax-nul 4338  ax-pow 4377  ax-pr 4403  ax-un 4701  ax-cnex 9046  ax-resscn 9047  ax-1cn 9048  ax-icn 9049  ax-addcl 9050  ax-addrcl 9051  ax-mulcl 9052  ax-mulrcl 9053  ax-mulcom 9054  ax-addass 9055  ax-mulass 9056  ax-distr 9057  ax-i2m1 9058  ax-1ne0 9059  ax-1rid 9060  ax-rnegex 9061  ax-rrecex 9062  ax-cnre 9063  ax-pre-lttri 9064  ax-pre-lttrn 9065  ax-pre-ltadd 9066  ax-pre-mulgt0 9067  ax-pre-sup 9068
This theorem depends on definitions:  df-bi 178  df-or 360  df-an 361  df-3or 937  df-3an 938  df-tru 1328  df-ex 1551  df-nf 1554  df-sb 1659  df-eu 2285  df-mo 2286  df-clab 2423  df-cleq 2429  df-clel 2432  df-nfc 2561  df-ne 2601  df-nel 2602  df-ral 2710  df-rex 2711  df-reu 2712  df-rmo 2713  df-rab 2714  df-v 2958  df-sbc 3162  df-csb 3252  df-dif 3323  df-un 3325  df-in 3327  df-ss 3334  df-pss 3336  df-nul 3629  df-if 3740  df-pw 3801  df-sn 3820  df-pr 3821  df-tp 3822  df-op 3823  df-uni 4016  df-iun 4095  df-br 4213  df-opab 4267  df-mpt 4268  df-tr 4303  df-eprel 4494  df-id 4498  df-po 4503  df-so 4504  df-fr 4541  df-we 4543  df-ord 4584  df-on 4585  df-lim 4586  df-suc 4587  df-om 4846  df-xp 4884  df-rel 4885  df-cnv 4886  df-co 4887  df-dm 4888  df-rn 4889  df-res 4890  df-ima 4891  df-iota 5418  df-fun 5456  df-fn 5457  df-f 5458  df-f1 5459  df-fo 5460  df-f1o 5461  df-fv 5462  df-ov 6084  df-oprab 6085  df-mpt2 6086  df-2nd 6350  df-riota 6549  df-recs 6633  df-rdg 6668  df-er 6905  df-en 7110  df-dom 7111  df-sdom 7112  df-sup 7446  df-pnf 9122  df-mnf 9123  df-xr 9124  df-ltxr 9125  df-le 9126  df-sub 9293  df-neg 9294  df-div 9678  df-nn 10001  df-2 10058  df-3 10059  df-n0 10222  df-z 10283  df-uz 10489  df-rp 10613  df-fl 11202  df-mod 11251  df-seq 11324  df-exp 11383  df-cj 11904  df-re 11905  df-im 11906  df-sqr 12040  df-abs 12041  df-dvds 12853  df-gcd 13007
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