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Theorem dvdsabseq 11855
Description: If two integers divide each other, they must be equal, up to a difference in sign. Theorem 1.1(j) in [ApostolNT] p. 14. (Contributed by Mario Carneiro, 30-May-2014.) (Revised by AV, 7-Aug-2021.)
Assertion
Ref Expression
dvdsabseq  |-  ( ( M  ||  N  /\  N  ||  M )  -> 
( abs `  M
)  =  ( abs `  N ) )

Proof of Theorem dvdsabseq
StepHypRef Expression
1 dvdszrcl 11801 . . 3  |-  ( M 
||  N  ->  ( M  e.  ZZ  /\  N  e.  ZZ ) )
2 simpr 110 . . . . . . 7  |-  ( ( M  ||  N  /\  N  ||  M )  ->  N  ||  M )
3 breq1 4008 . . . . . . . . 9  |-  ( N  =  0  ->  ( N  ||  M  <->  0  ||  M ) )
4 0dvds 11820 . . . . . . . . . . 11  |-  ( M  e.  ZZ  ->  (
0  ||  M  <->  M  = 
0 ) )
54adantr 276 . . . . . . . . . 10  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( 0  ||  M  <->  M  =  0 ) )
6 zcn 9260 . . . . . . . . . . . . 13  |-  ( M  e.  ZZ  ->  M  e.  CC )
76abs00ad 11076 . . . . . . . . . . . 12  |-  ( M  e.  ZZ  ->  (
( abs `  M
)  =  0  <->  M  =  0 ) )
87bicomd 141 . . . . . . . . . . 11  |-  ( M  e.  ZZ  ->  ( M  =  0  <->  ( abs `  M )  =  0 ) )
98adantr 276 . . . . . . . . . 10  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( M  =  0  <-> 
( abs `  M
)  =  0 ) )
105, 9bitrd 188 . . . . . . . . 9  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( 0  ||  M  <->  ( abs `  M )  =  0 ) )
113, 10sylan9bb 462 . . . . . . . 8  |-  ( ( N  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  ->  ( N  ||  M  <->  ( abs `  M
)  =  0 ) )
12 fveq2 5517 . . . . . . . . . . 11  |-  ( N  =  0  ->  ( abs `  N )  =  ( abs `  0
) )
13 abs0 11069 . . . . . . . . . . 11  |-  ( abs `  0 )  =  0
1412, 13eqtrdi 2226 . . . . . . . . . 10  |-  ( N  =  0  ->  ( abs `  N )  =  0 )
1514adantr 276 . . . . . . . . 9  |-  ( ( N  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  ->  ( abs `  N )  =  0 )
1615eqeq2d 2189 . . . . . . . 8  |-  ( ( N  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  ->  ( ( abs `  M )  =  ( abs `  N
)  <->  ( abs `  M
)  =  0 ) )
1711, 16bitr4d 191 . . . . . . 7  |-  ( ( N  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  ->  ( N  ||  M  <->  ( abs `  M
)  =  ( abs `  N ) ) )
182, 17imbitrid 154 . . . . . 6  |-  ( ( N  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  ->  ( ( M  ||  N  /\  N  ||  M )  ->  ( abs `  M )  =  ( abs `  N
) ) )
1918expd 258 . . . . 5  |-  ( ( N  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  ->  ( M  ||  N  ->  ( N  ||  M  ->  ( abs `  M )  =  ( abs `  N ) ) ) )
2019expcom 116 . . . 4  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( N  =  0  ->  ( M  ||  N  ->  ( N  ||  M  ->  ( abs `  M
)  =  ( abs `  N ) ) ) ) )
21 simprl 529 . . . . . . 7  |-  ( ( -.  N  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  ->  M  e.  ZZ )
22 simpr 110 . . . . . . . 8  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  N  e.  ZZ )
2322adantl 277 . . . . . . 7  |-  ( ( -.  N  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  ->  N  e.  ZZ )
24 neqne 2355 . . . . . . . 8  |-  ( -.  N  =  0  ->  N  =/=  0 )
2524adantr 276 . . . . . . 7  |-  ( ( -.  N  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  ->  N  =/=  0 )
26 dvdsleabs2 11854 . . . . . . 7  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ  /\  N  =/=  0 )  ->  ( M  ||  N  ->  ( abs `  M )  <_ 
( abs `  N
) ) )
2721, 23, 25, 26syl3anc 1238 . . . . . 6  |-  ( ( -.  N  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  -> 
( M  ||  N  ->  ( abs `  M
)  <_  ( abs `  N ) ) )
28 simpr 110 . . . . . . . . . . . . 13  |-  ( ( N  ||  M  /\  M  ||  N )  ->  M  ||  N )
29 breq1 4008 . . . . . . . . . . . . . . 15  |-  ( M  =  0  ->  ( M  ||  N  <->  0  ||  N ) )
30 0dvds 11820 . . . . . . . . . . . . . . . . 17  |-  ( N  e.  ZZ  ->  (
0  ||  N  <->  N  = 
0 ) )
31 zcn 9260 . . . . . . . . . . . . . . . . . . 19  |-  ( N  e.  ZZ  ->  N  e.  CC )
3231abs00ad 11076 . . . . . . . . . . . . . . . . . 18  |-  ( N  e.  ZZ  ->  (
( abs `  N
)  =  0  <->  N  =  0 ) )
33 eqcom 2179 . . . . . . . . . . . . . . . . . 18  |-  ( ( abs `  N )  =  0  <->  0  =  ( abs `  N ) )
3432, 33bitr3di 195 . . . . . . . . . . . . . . . . 17  |-  ( N  e.  ZZ  ->  ( N  =  0  <->  0  =  ( abs `  N ) ) )
3530, 34bitrd 188 . . . . . . . . . . . . . . . 16  |-  ( N  e.  ZZ  ->  (
0  ||  N  <->  0  =  ( abs `  N ) ) )
3635adantl 277 . . . . . . . . . . . . . . 15  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( 0  ||  N  <->  0  =  ( abs `  N
) ) )
3729, 36sylan9bb 462 . . . . . . . . . . . . . 14  |-  ( ( M  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  ->  ( M  ||  N  <->  0  =  ( abs `  N ) ) )
38 fveq2 5517 . . . . . . . . . . . . . . . . 17  |-  ( M  =  0  ->  ( abs `  M )  =  ( abs `  0
) )
3938, 13eqtrdi 2226 . . . . . . . . . . . . . . . 16  |-  ( M  =  0  ->  ( abs `  M )  =  0 )
4039adantr 276 . . . . . . . . . . . . . . 15  |-  ( ( M  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  ->  ( abs `  M )  =  0 )
4140eqeq1d 2186 . . . . . . . . . . . . . 14  |-  ( ( M  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  ->  ( ( abs `  M )  =  ( abs `  N
)  <->  0  =  ( abs `  N ) ) )
4237, 41bitr4d 191 . . . . . . . . . . . . 13  |-  ( ( M  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  ->  ( M  ||  N  <->  ( abs `  M
)  =  ( abs `  N ) ) )
4328, 42imbitrid 154 . . . . . . . . . . . 12  |-  ( ( M  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  ->  ( ( N  ||  M  /\  M  ||  N )  ->  ( abs `  M )  =  ( abs `  N
) ) )
4443a1dd 48 . . . . . . . . . . 11  |-  ( ( M  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  ->  ( ( N  ||  M  /\  M  ||  N )  ->  (
( abs `  M
)  <_  ( abs `  N )  ->  ( abs `  M )  =  ( abs `  N
) ) ) )
4544expcomd 1441 . . . . . . . . . 10  |-  ( ( M  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  ->  ( M  ||  N  ->  ( N  ||  M  ->  ( ( abs `  M )  <_ 
( abs `  N
)  ->  ( abs `  M )  =  ( abs `  N ) ) ) ) )
4645expcom 116 . . . . . . . . 9  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( M  =  0  ->  ( M  ||  N  ->  ( N  ||  M  ->  ( ( abs `  M )  <_  ( abs `  N )  -> 
( abs `  M
)  =  ( abs `  N ) ) ) ) ) )
4722adantl 277 . . . . . . . . . . . . 13  |-  ( ( -.  M  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  ->  N  e.  ZZ )
48 simprl 529 . . . . . . . . . . . . 13  |-  ( ( -.  M  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  ->  M  e.  ZZ )
49 neqne 2355 . . . . . . . . . . . . . 14  |-  ( -.  M  =  0  ->  M  =/=  0 )
5049adantr 276 . . . . . . . . . . . . 13  |-  ( ( -.  M  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  ->  M  =/=  0 )
51 dvdsleabs2 11854 . . . . . . . . . . . . 13  |-  ( ( N  e.  ZZ  /\  M  e.  ZZ  /\  M  =/=  0 )  ->  ( N  ||  M  ->  ( abs `  N )  <_ 
( abs `  M
) ) )
5247, 48, 50, 51syl3anc 1238 . . . . . . . . . . . 12  |-  ( ( -.  M  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  -> 
( N  ||  M  ->  ( abs `  N
)  <_  ( abs `  M ) ) )
53 eqcom 2179 . . . . . . . . . . . . . . . 16  |-  ( ( abs `  M )  =  ( abs `  N
)  <->  ( abs `  N
)  =  ( abs `  M ) )
5431abscld 11192 . . . . . . . . . . . . . . . . 17  |-  ( N  e.  ZZ  ->  ( abs `  N )  e.  RR )
556abscld 11192 . . . . . . . . . . . . . . . . 17  |-  ( M  e.  ZZ  ->  ( abs `  M )  e.  RR )
56 letri3 8040 . . . . . . . . . . . . . . . . 17  |-  ( ( ( abs `  N
)  e.  RR  /\  ( abs `  M )  e.  RR )  -> 
( ( abs `  N
)  =  ( abs `  M )  <->  ( ( abs `  N )  <_ 
( abs `  M
)  /\  ( abs `  M )  <_  ( abs `  N ) ) ) )
5754, 55, 56syl2anr 290 . . . . . . . . . . . . . . . 16  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( ( abs `  N
)  =  ( abs `  M )  <->  ( ( abs `  N )  <_ 
( abs `  M
)  /\  ( abs `  M )  <_  ( abs `  N ) ) ) )
5853, 57bitrid 192 . . . . . . . . . . . . . . 15  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( ( abs `  M
)  =  ( abs `  N )  <->  ( ( abs `  N )  <_ 
( abs `  M
)  /\  ( abs `  M )  <_  ( abs `  N ) ) ) )
5958biimprd 158 . . . . . . . . . . . . . 14  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( ( ( abs `  N )  <_  ( abs `  M )  /\  ( abs `  M )  <_  ( abs `  N
) )  ->  ( abs `  M )  =  ( abs `  N
) ) )
6059expd 258 . . . . . . . . . . . . 13  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( ( abs `  N
)  <_  ( abs `  M )  ->  (
( abs `  M
)  <_  ( abs `  N )  ->  ( abs `  M )  =  ( abs `  N
) ) ) )
6160adantl 277 . . . . . . . . . . . 12  |-  ( ( -.  M  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  -> 
( ( abs `  N
)  <_  ( abs `  M )  ->  (
( abs `  M
)  <_  ( abs `  N )  ->  ( abs `  M )  =  ( abs `  N
) ) ) )
6252, 61syld 45 . . . . . . . . . . 11  |-  ( ( -.  M  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  -> 
( N  ||  M  ->  ( ( abs `  M
)  <_  ( abs `  N )  ->  ( abs `  M )  =  ( abs `  N
) ) ) )
6362a1d 22 . . . . . . . . . 10  |-  ( ( -.  M  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  -> 
( M  ||  N  ->  ( N  ||  M  ->  ( ( abs `  M
)  <_  ( abs `  N )  ->  ( abs `  M )  =  ( abs `  N
) ) ) ) )
6463expcom 116 . . . . . . . . 9  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( -.  M  =  0  ->  ( M  ||  N  ->  ( N  ||  M  ->  ( ( abs `  M )  <_ 
( abs `  N
)  ->  ( abs `  M )  =  ( abs `  N ) ) ) ) ) )
65 0z 9266 . . . . . . . . . . . 12  |-  0  e.  ZZ
66 zdceq 9330 . . . . . . . . . . . 12  |-  ( ( M  e.  ZZ  /\  0  e.  ZZ )  -> DECID  M  =  0 )
6765, 66mpan2 425 . . . . . . . . . . 11  |-  ( M  e.  ZZ  -> DECID  M  =  0
)
68 exmiddc 836 . . . . . . . . . . 11  |-  (DECID  M  =  0  ->  ( M  =  0  \/  -.  M  =  0 ) )
6967, 68syl 14 . . . . . . . . . 10  |-  ( M  e.  ZZ  ->  ( M  =  0  \/  -.  M  =  0
) )
7069adantr 276 . . . . . . . . 9  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( M  =  0  \/  -.  M  =  0 ) )
7146, 64, 70mpjaod 718 . . . . . . . 8  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( M  ||  N  ->  ( N  ||  M  ->  ( ( abs `  M
)  <_  ( abs `  N )  ->  ( abs `  M )  =  ( abs `  N
) ) ) ) )
7271com34 83 . . . . . . 7  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( M  ||  N  ->  ( ( abs `  M
)  <_  ( abs `  N )  ->  ( N  ||  M  ->  ( abs `  M )  =  ( abs `  N
) ) ) ) )
7372adantl 277 . . . . . 6  |-  ( ( -.  N  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  -> 
( M  ||  N  ->  ( ( abs `  M
)  <_  ( abs `  N )  ->  ( N  ||  M  ->  ( abs `  M )  =  ( abs `  N
) ) ) ) )
7427, 73mpdd 41 . . . . 5  |-  ( ( -.  N  =  0  /\  ( M  e.  ZZ  /\  N  e.  ZZ ) )  -> 
( M  ||  N  ->  ( N  ||  M  ->  ( abs `  M
)  =  ( abs `  N ) ) ) )
7574expcom 116 . . . 4  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( -.  N  =  0  ->  ( M  ||  N  ->  ( N  ||  M  ->  ( abs `  M )  =  ( abs `  N ) ) ) ) )
76 zdceq 9330 . . . . . . 7  |-  ( ( N  e.  ZZ  /\  0  e.  ZZ )  -> DECID  N  =  0 )
7765, 76mpan2 425 . . . . . 6  |-  ( N  e.  ZZ  -> DECID  N  =  0
)
78 exmiddc 836 . . . . . 6  |-  (DECID  N  =  0  ->  ( N  =  0  \/  -.  N  =  0 ) )
7977, 78syl 14 . . . . 5  |-  ( N  e.  ZZ  ->  ( N  =  0  \/  -.  N  =  0
) )
8079adantl 277 . . . 4  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( N  =  0  \/  -.  N  =  0 ) )
8120, 75, 80mpjaod 718 . . 3  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( M  ||  N  ->  ( N  ||  M  ->  ( abs `  M
)  =  ( abs `  N ) ) ) )
821, 81mpcom 36 . 2  |-  ( M 
||  N  ->  ( N  ||  M  ->  ( abs `  M )  =  ( abs `  N
) ) )
8382imp 124 1  |-  ( ( M  ||  N  /\  N  ||  M )  -> 
( abs `  M
)  =  ( abs `  N ) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 104    <-> wb 105    \/ wo 708  DECID wdc 834    = wceq 1353    e. wcel 2148    =/= wne 2347   class class class wbr 4005   ` cfv 5218   RRcr 7812   0cc0 7813    <_ cle 7995   ZZcz 9255   abscabs 11008    || cdvds 11796
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 614  ax-in2 615  ax-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-13 2150  ax-14 2151  ax-ext 2159  ax-coll 4120  ax-sep 4123  ax-nul 4131  ax-pow 4176  ax-pr 4211  ax-un 4435  ax-setind 4538  ax-iinf 4589  ax-cnex 7904  ax-resscn 7905  ax-1cn 7906  ax-1re 7907  ax-icn 7908  ax-addcl 7909  ax-addrcl 7910  ax-mulcl 7911  ax-mulrcl 7912  ax-addcom 7913  ax-mulcom 7914  ax-addass 7915  ax-mulass 7916  ax-distr 7917  ax-i2m1 7918  ax-0lt1 7919  ax-1rid 7920  ax-0id 7921  ax-rnegex 7922  ax-precex 7923  ax-cnre 7924  ax-pre-ltirr 7925  ax-pre-ltwlin 7926  ax-pre-lttrn 7927  ax-pre-apti 7928  ax-pre-ltadd 7929  ax-pre-mulgt0 7930  ax-pre-mulext 7931  ax-arch 7932  ax-caucvg 7933
This theorem depends on definitions:  df-bi 117  df-dc 835  df-3or 979  df-3an 980  df-tru 1356  df-fal 1359  df-nf 1461  df-sb 1763  df-eu 2029  df-mo 2030  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ne 2348  df-nel 2443  df-ral 2460  df-rex 2461  df-reu 2462  df-rmo 2463  df-rab 2464  df-v 2741  df-sbc 2965  df-csb 3060  df-dif 3133  df-un 3135  df-in 3137  df-ss 3144  df-nul 3425  df-if 3537  df-pw 3579  df-sn 3600  df-pr 3601  df-op 3603  df-uni 3812  df-int 3847  df-iun 3890  df-br 4006  df-opab 4067  df-mpt 4068  df-tr 4104  df-id 4295  df-po 4298  df-iso 4299  df-iord 4368  df-on 4370  df-ilim 4371  df-suc 4373  df-iom 4592  df-xp 4634  df-rel 4635  df-cnv 4636  df-co 4637  df-dm 4638  df-rn 4639  df-res 4640  df-ima 4641  df-iota 5180  df-fun 5220  df-fn 5221  df-f 5222  df-f1 5223  df-fo 5224  df-f1o 5225  df-fv 5226  df-riota 5833  df-ov 5880  df-oprab 5881  df-mpo 5882  df-1st 6143  df-2nd 6144  df-recs 6308  df-frec 6394  df-pnf 7996  df-mnf 7997  df-xr 7998  df-ltxr 7999  df-le 8000  df-sub 8132  df-neg 8133  df-reap 8534  df-ap 8541  df-div 8632  df-inn 8922  df-2 8980  df-3 8981  df-4 8982  df-n0 9179  df-z 9256  df-uz 9531  df-q 9622  df-rp 9656  df-seqfrec 10448  df-exp 10522  df-cj 10853  df-re 10854  df-im 10855  df-rsqrt 11009  df-abs 11010  df-dvds 11797
This theorem is referenced by:  dvdseq  11856
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