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Theorem zmulcl 8485
Description: Closure of multiplication of integers. (Contributed by NM, 30-Jul-2004.)
Assertion
Ref Expression
zmulcl  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( M  x.  N
)  e.  ZZ )

Proof of Theorem zmulcl
StepHypRef Expression
1 elznn0 8447 . 2  |-  ( M  e.  ZZ  <->  ( M  e.  RR  /\  ( M  e.  NN0  \/  -u M  e.  NN0 ) ) )
2 elznn0 8447 . 2  |-  ( N  e.  ZZ  <->  ( N  e.  RR  /\  ( N  e.  NN0  \/  -u N  e.  NN0 ) ) )
3 nn0mulcl 8391 . . . . . . . . 9  |-  ( ( M  e.  NN0  /\  N  e.  NN0 )  -> 
( M  x.  N
)  e.  NN0 )
43orcd 685 . . . . . . . 8  |-  ( ( M  e.  NN0  /\  N  e.  NN0 )  -> 
( ( M  x.  N )  e.  NN0  \/  -u ( M  x.  N
)  e.  NN0 )
)
54a1i 9 . . . . . . 7  |-  ( ( M  e.  RR  /\  N  e.  RR )  ->  ( ( M  e. 
NN0  /\  N  e.  NN0 )  ->  ( ( M  x.  N )  e.  NN0  \/  -u ( M  x.  N )  e.  NN0 ) ) )
6 remulcl 7163 . . . . . . 7  |-  ( ( M  e.  RR  /\  N  e.  RR )  ->  ( M  x.  N
)  e.  RR )
75, 6jctild 309 . . . . . 6  |-  ( ( M  e.  RR  /\  N  e.  RR )  ->  ( ( M  e. 
NN0  /\  N  e.  NN0 )  ->  ( ( M  x.  N )  e.  RR  /\  ( ( M  x.  N )  e.  NN0  \/  -u ( M  x.  N )  e.  NN0 ) ) ) )
8 nn0mulcl 8391 . . . . . . . . 9  |-  ( (
-u M  e.  NN0  /\  N  e.  NN0 )  ->  ( -u M  x.  N )  e.  NN0 )
9 recn 7168 . . . . . . . . . . 11  |-  ( M  e.  RR  ->  M  e.  CC )
10 recn 7168 . . . . . . . . . . 11  |-  ( N  e.  RR  ->  N  e.  CC )
11 mulneg1 7566 . . . . . . . . . . 11  |-  ( ( M  e.  CC  /\  N  e.  CC )  ->  ( -u M  x.  N )  =  -u ( M  x.  N
) )
129, 10, 11syl2an 283 . . . . . . . . . 10  |-  ( ( M  e.  RR  /\  N  e.  RR )  ->  ( -u M  x.  N )  =  -u ( M  x.  N
) )
1312eleq1d 2148 . . . . . . . . 9  |-  ( ( M  e.  RR  /\  N  e.  RR )  ->  ( ( -u M  x.  N )  e.  NN0  <->  -u ( M  x.  N )  e.  NN0 ) )
148, 13syl5ib 152 . . . . . . . 8  |-  ( ( M  e.  RR  /\  N  e.  RR )  ->  ( ( -u M  e.  NN0  /\  N  e. 
NN0 )  ->  -u ( M  x.  N )  e.  NN0 ) )
15 olc 665 . . . . . . . 8  |-  ( -u ( M  x.  N
)  e.  NN0  ->  ( ( M  x.  N
)  e.  NN0  \/  -u ( M  x.  N
)  e.  NN0 )
)
1614, 15syl6 33 . . . . . . 7  |-  ( ( M  e.  RR  /\  N  e.  RR )  ->  ( ( -u M  e.  NN0  /\  N  e. 
NN0 )  ->  (
( M  x.  N
)  e.  NN0  \/  -u ( M  x.  N
)  e.  NN0 )
) )
1716, 6jctild 309 . . . . . 6  |-  ( ( M  e.  RR  /\  N  e.  RR )  ->  ( ( -u M  e.  NN0  /\  N  e. 
NN0 )  ->  (
( M  x.  N
)  e.  RR  /\  ( ( M  x.  N )  e.  NN0  \/  -u ( M  x.  N
)  e.  NN0 )
) ) )
18 nn0mulcl 8391 . . . . . . . . 9  |-  ( ( M  e.  NN0  /\  -u N  e.  NN0 )  ->  ( M  x.  -u N
)  e.  NN0 )
19 mulneg2 7567 . . . . . . . . . . 11  |-  ( ( M  e.  CC  /\  N  e.  CC )  ->  ( M  x.  -u N
)  =  -u ( M  x.  N )
)
209, 10, 19syl2an 283 . . . . . . . . . 10  |-  ( ( M  e.  RR  /\  N  e.  RR )  ->  ( M  x.  -u N
)  =  -u ( M  x.  N )
)
2120eleq1d 2148 . . . . . . . . 9  |-  ( ( M  e.  RR  /\  N  e.  RR )  ->  ( ( M  x.  -u N )  e.  NN0  <->  -u ( M  x.  N )  e.  NN0 ) )
2218, 21syl5ib 152 . . . . . . . 8  |-  ( ( M  e.  RR  /\  N  e.  RR )  ->  ( ( M  e. 
NN0  /\  -u N  e. 
NN0 )  ->  -u ( M  x.  N )  e.  NN0 ) )
2322, 15syl6 33 . . . . . . 7  |-  ( ( M  e.  RR  /\  N  e.  RR )  ->  ( ( M  e. 
NN0  /\  -u N  e. 
NN0 )  ->  (
( M  x.  N
)  e.  NN0  \/  -u ( M  x.  N
)  e.  NN0 )
) )
2423, 6jctild 309 . . . . . 6  |-  ( ( M  e.  RR  /\  N  e.  RR )  ->  ( ( M  e. 
NN0  /\  -u N  e. 
NN0 )  ->  (
( M  x.  N
)  e.  RR  /\  ( ( M  x.  N )  e.  NN0  \/  -u ( M  x.  N
)  e.  NN0 )
) ) )
25 nn0mulcl 8391 . . . . . . . . 9  |-  ( (
-u M  e.  NN0  /\  -u N  e.  NN0 )  ->  ( -u M  x.  -u N )  e. 
NN0 )
26 mul2neg 7569 . . . . . . . . . . 11  |-  ( ( M  e.  CC  /\  N  e.  CC )  ->  ( -u M  x.  -u N )  =  ( M  x.  N ) )
279, 10, 26syl2an 283 . . . . . . . . . 10  |-  ( ( M  e.  RR  /\  N  e.  RR )  ->  ( -u M  x.  -u N )  =  ( M  x.  N ) )
2827eleq1d 2148 . . . . . . . . 9  |-  ( ( M  e.  RR  /\  N  e.  RR )  ->  ( ( -u M  x.  -u N )  e. 
NN0 
<->  ( M  x.  N
)  e.  NN0 )
)
2925, 28syl5ib 152 . . . . . . . 8  |-  ( ( M  e.  RR  /\  N  e.  RR )  ->  ( ( -u M  e.  NN0  /\  -u N  e.  NN0 )  ->  ( M  x.  N )  e.  NN0 ) )
30 orc 666 . . . . . . . 8  |-  ( ( M  x.  N )  e.  NN0  ->  ( ( M  x.  N )  e.  NN0  \/  -u ( M  x.  N )  e.  NN0 ) )
3129, 30syl6 33 . . . . . . 7  |-  ( ( M  e.  RR  /\  N  e.  RR )  ->  ( ( -u M  e.  NN0  /\  -u N  e.  NN0 )  ->  (
( M  x.  N
)  e.  NN0  \/  -u ( M  x.  N
)  e.  NN0 )
) )
3231, 6jctild 309 . . . . . 6  |-  ( ( M  e.  RR  /\  N  e.  RR )  ->  ( ( -u M  e.  NN0  /\  -u N  e.  NN0 )  ->  (
( M  x.  N
)  e.  RR  /\  ( ( M  x.  N )  e.  NN0  \/  -u ( M  x.  N
)  e.  NN0 )
) ) )
337, 17, 24, 32ccased 907 . . . . 5  |-  ( ( M  e.  RR  /\  N  e.  RR )  ->  ( ( ( M  e.  NN0  \/  -u M  e.  NN0 )  /\  ( N  e.  NN0  \/  -u N  e.  NN0 ) )  -> 
( ( M  x.  N )  e.  RR  /\  ( ( M  x.  N )  e.  NN0  \/  -u ( M  x.  N
)  e.  NN0 )
) ) )
34 elznn0 8447 . . . . 5  |-  ( ( M  x.  N )  e.  ZZ  <->  ( ( M  x.  N )  e.  RR  /\  ( ( M  x.  N )  e.  NN0  \/  -u ( M  x.  N )  e.  NN0 ) ) )
3533, 34syl6ibr 160 . . . 4  |-  ( ( M  e.  RR  /\  N  e.  RR )  ->  ( ( ( M  e.  NN0  \/  -u M  e.  NN0 )  /\  ( N  e.  NN0  \/  -u N  e.  NN0 ) )  -> 
( M  x.  N
)  e.  ZZ ) )
3635imp 122 . . 3  |-  ( ( ( M  e.  RR  /\  N  e.  RR )  /\  ( ( M  e.  NN0  \/  -u M  e.  NN0 )  /\  ( N  e.  NN0  \/  -u N  e.  NN0 ) ) )  ->  ( M  x.  N )  e.  ZZ )
3736an4s 553 . 2  |-  ( ( ( M  e.  RR  /\  ( M  e.  NN0  \/  -u M  e.  NN0 ) )  /\  ( N  e.  RR  /\  ( N  e.  NN0  \/  -u N  e.  NN0 ) ) )  ->  ( M  x.  N )  e.  ZZ )
381, 2, 37syl2anb 285 1  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( M  x.  N
)  e.  ZZ )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 102    \/ wo 662    = wceq 1285    e. wcel 1434  (class class class)co 5543   CCcc 7041   RRcr 7042    x. cmul 7048   -ucneg 7347   NN0cn0 8355   ZZcz 8432
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-in1 577  ax-in2 578  ax-io 663  ax-5 1377  ax-7 1378  ax-gen 1379  ax-ie1 1423  ax-ie2 1424  ax-8 1436  ax-10 1437  ax-11 1438  ax-i12 1439  ax-bndl 1440  ax-4 1441  ax-14 1446  ax-17 1460  ax-i9 1464  ax-ial 1468  ax-i5r 1469  ax-ext 2064  ax-sep 3904  ax-pow 3956  ax-pr 3972  ax-setind 4288  ax-cnex 7129  ax-resscn 7130  ax-1cn 7131  ax-1re 7132  ax-icn 7133  ax-addcl 7134  ax-addrcl 7135  ax-mulcl 7136  ax-mulrcl 7137  ax-addcom 7138  ax-mulcom 7139  ax-addass 7140  ax-mulass 7141  ax-distr 7142  ax-i2m1 7143  ax-1rid 7145  ax-0id 7146  ax-rnegex 7147  ax-cnre 7149
This theorem depends on definitions:  df-bi 115  df-3or 921  df-3an 922  df-tru 1288  df-fal 1291  df-nf 1391  df-sb 1687  df-eu 1945  df-mo 1946  df-clab 2069  df-cleq 2075  df-clel 2078  df-nfc 2209  df-ne 2247  df-ral 2354  df-rex 2355  df-reu 2356  df-rab 2358  df-v 2604  df-sbc 2817  df-dif 2976  df-un 2978  df-in 2980  df-ss 2987  df-pw 3392  df-sn 3412  df-pr 3413  df-op 3415  df-uni 3610  df-int 3645  df-br 3794  df-opab 3848  df-id 4056  df-xp 4377  df-rel 4378  df-cnv 4379  df-co 4380  df-dm 4381  df-iota 4897  df-fun 4934  df-fv 4940  df-riota 5499  df-ov 5546  df-oprab 5547  df-mpt2 5548  df-sub 7348  df-neg 7349  df-inn 8107  df-n0 8356  df-z 8433
This theorem is referenced by:  zdivmul  8518  msqznn  8528  zmulcld  8556  uz2mulcl  8776  qaddcl  8801  qmulcl  8803  qreccl  8808  fzctr  9221  flqmulnn0  9381  zexpcl  9588  iexpcyc  9676  zesq  9688  dvdsmul1  10362  dvdsmul2  10363  muldvds1  10365  muldvds2  10366  dvdscmul  10367  dvdsmulc  10368  dvds2ln  10373  dvdstr  10377  dvdsmultr1  10378  dvdsmultr2  10380  3dvdsdec  10409  3dvds2dec  10410  oexpneg  10421  mulsucdiv2z  10429  divalgb  10469  divalgmod  10471  ndvdsi  10477  absmulgcd  10550  gcdmultiple  10553  gcdmultiplez  10554  dvdsmulgcd  10558  rpmulgcd  10559  lcmcllem  10593  rpmul  10624  cncongr1  10629  cncongr2  10630
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