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Theorem dfgcd3 11965
Description: Alternate definition of the  gcd operator. (Contributed by Jim Kingdon, 31-Dec-2021.)
Assertion
Ref Expression
dfgcd3  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( M  gcd  N
)  =  ( iota_ d  e.  NN0  A. z  e.  ZZ  ( z  ||  d 
<->  ( z  ||  M  /\  z  ||  N ) ) ) )
Distinct variable groups:    M, d, z    N, d, z

Proof of Theorem dfgcd3
Dummy variables  a  b  r  w are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 gcd0val 11915 . . 3  |-  ( 0  gcd  0 )  =  0
2 simprl 526 . . . 4  |-  ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  ->  M  =  0 )
3 simprr 527 . . . 4  |-  ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  ->  N  =  0 )
42, 3oveq12d 5871 . . 3  |-  ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  -> 
( M  gcd  N
)  =  ( 0  gcd  0 ) )
5 0nn0 9150 . . . . 5  |-  0  e.  NN0
65a1i 9 . . . 4  |-  ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  -> 
0  e.  NN0 )
7 0dvds 11773 . . . . . . . . . . 11  |-  ( M  e.  ZZ  ->  (
0  ||  M  <->  M  = 
0 ) )
87ad2antrr 485 . . . . . . . . . 10  |-  ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  -> 
( 0  ||  M  <->  M  =  0 ) )
92, 8mpbird 166 . . . . . . . . 9  |-  ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  -> 
0  ||  M )
10 0dvds 11773 . . . . . . . . . . 11  |-  ( N  e.  ZZ  ->  (
0  ||  N  <->  N  = 
0 ) )
1110ad2antlr 486 . . . . . . . . . 10  |-  ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  -> 
( 0  ||  N  <->  N  =  0 ) )
123, 11mpbird 166 . . . . . . . . 9  |-  ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  -> 
0  ||  N )
139, 12jca 304 . . . . . . . 8  |-  ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  -> 
( 0  ||  M  /\  0  ||  N ) )
1413ad2antrr 485 . . . . . . 7  |-  ( ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  /\  d  e. 
NN0 )  /\  A. z  e.  ZZ  (
z  ||  d  <->  ( z  ||  M  /\  z  ||  N ) ) )  ->  ( 0  ||  M  /\  0  ||  N
) )
15 0z 9223 . . . . . . . . 9  |-  0  e.  ZZ
16 breq1 3992 . . . . . . . . . . 11  |-  ( z  =  0  ->  (
z  ||  d  <->  0  ||  d ) )
17 breq1 3992 . . . . . . . . . . . 12  |-  ( z  =  0  ->  (
z  ||  M  <->  0  ||  M ) )
18 breq1 3992 . . . . . . . . . . . 12  |-  ( z  =  0  ->  (
z  ||  N  <->  0  ||  N ) )
1917, 18anbi12d 470 . . . . . . . . . . 11  |-  ( z  =  0  ->  (
( z  ||  M  /\  z  ||  N )  <-> 
( 0  ||  M  /\  0  ||  N ) ) )
2016, 19bibi12d 234 . . . . . . . . . 10  |-  ( z  =  0  ->  (
( z  ||  d  <->  ( z  ||  M  /\  z  ||  N ) )  <-> 
( 0  ||  d  <->  ( 0  ||  M  /\  0  ||  N ) ) ) )
2120rspcv 2830 . . . . . . . . 9  |-  ( 0  e.  ZZ  ->  ( A. z  e.  ZZ  ( z  ||  d  <->  ( z  ||  M  /\  z  ||  N ) )  ->  ( 0  ||  d 
<->  ( 0  ||  M  /\  0  ||  N ) ) ) )
2215, 21ax-mp 5 . . . . . . . 8  |-  ( A. z  e.  ZZ  (
z  ||  d  <->  ( z  ||  M  /\  z  ||  N ) )  -> 
( 0  ||  d  <->  ( 0  ||  M  /\  0  ||  N ) ) )
2322adantl 275 . . . . . . 7  |-  ( ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  /\  d  e. 
NN0 )  /\  A. z  e.  ZZ  (
z  ||  d  <->  ( z  ||  M  /\  z  ||  N ) ) )  ->  ( 0  ||  d 
<->  ( 0  ||  M  /\  0  ||  N ) ) )
2414, 23mpbird 166 . . . . . 6  |-  ( ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  /\  d  e. 
NN0 )  /\  A. z  e.  ZZ  (
z  ||  d  <->  ( z  ||  M  /\  z  ||  N ) ) )  ->  0  ||  d
)
25 simplr 525 . . . . . . . 8  |-  ( ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  /\  d  e. 
NN0 )  /\  A. z  e.  ZZ  (
z  ||  d  <->  ( z  ||  M  /\  z  ||  N ) ) )  ->  d  e.  NN0 )
2625nn0zd 9332 . . . . . . 7  |-  ( ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  /\  d  e. 
NN0 )  /\  A. z  e.  ZZ  (
z  ||  d  <->  ( z  ||  M  /\  z  ||  N ) ) )  ->  d  e.  ZZ )
27 0dvds 11773 . . . . . . 7  |-  ( d  e.  ZZ  ->  (
0  ||  d  <->  d  = 
0 ) )
2826, 27syl 14 . . . . . 6  |-  ( ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  /\  d  e. 
NN0 )  /\  A. z  e.  ZZ  (
z  ||  d  <->  ( z  ||  M  /\  z  ||  N ) ) )  ->  ( 0  ||  d 
<->  d  =  0 ) )
2924, 28mpbid 146 . . . . 5  |-  ( ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  /\  d  e. 
NN0 )  /\  A. z  e.  ZZ  (
z  ||  d  <->  ( z  ||  M  /\  z  ||  N ) ) )  ->  d  =  0 )
30 dvds0 11768 . . . . . . . . 9  |-  ( z  e.  ZZ  ->  z  ||  0 )
3130adantl 275 . . . . . . . 8  |-  ( ( ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  /\  d  e.  NN0 )  /\  d  =  0 )  /\  z  e.  ZZ )  ->  z  ||  0 )
32 breq2 3993 . . . . . . . . 9  |-  ( d  =  0  ->  (
z  ||  d  <->  z  ||  0 ) )
3332ad2antlr 486 . . . . . . . 8  |-  ( ( ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  /\  d  e.  NN0 )  /\  d  =  0 )  /\  z  e.  ZZ )  ->  ( z  ||  d  <->  z 
||  0 ) )
3431, 33mpbird 166 . . . . . . 7  |-  ( ( ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  /\  d  e.  NN0 )  /\  d  =  0 )  /\  z  e.  ZZ )  ->  z  ||  d )
352ad3antrrr 489 . . . . . . . . 9  |-  ( ( ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  /\  d  e.  NN0 )  /\  d  =  0 )  /\  z  e.  ZZ )  ->  M  =  0 )
3631, 35breqtrrd 4017 . . . . . . . 8  |-  ( ( ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  /\  d  e.  NN0 )  /\  d  =  0 )  /\  z  e.  ZZ )  ->  z  ||  M )
373ad3antrrr 489 . . . . . . . . 9  |-  ( ( ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  /\  d  e.  NN0 )  /\  d  =  0 )  /\  z  e.  ZZ )  ->  N  =  0 )
3831, 37breqtrrd 4017 . . . . . . . 8  |-  ( ( ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  /\  d  e.  NN0 )  /\  d  =  0 )  /\  z  e.  ZZ )  ->  z  ||  N )
3936, 38jca 304 . . . . . . 7  |-  ( ( ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  /\  d  e.  NN0 )  /\  d  =  0 )  /\  z  e.  ZZ )  ->  ( z  ||  M  /\  z  ||  N ) )
4034, 392thd 174 . . . . . 6  |-  ( ( ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  /\  d  e.  NN0 )  /\  d  =  0 )  /\  z  e.  ZZ )  ->  ( z  ||  d  <->  ( z  ||  M  /\  z  ||  N ) ) )
4140ralrimiva 2543 . . . . 5  |-  ( ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  /\  d  e. 
NN0 )  /\  d  =  0 )  ->  A. z  e.  ZZ  ( z  ||  d  <->  ( z  ||  M  /\  z  ||  N ) ) )
4229, 41impbida 591 . . . 4  |-  ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  /\  d  e. 
NN0 )  ->  ( A. z  e.  ZZ  ( z  ||  d  <->  ( z  ||  M  /\  z  ||  N ) )  <-> 
d  =  0 ) )
436, 42riota5 5834 . . 3  |-  ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  -> 
( iota_ d  e.  NN0  A. z  e.  ZZ  (
z  ||  d  <->  ( z  ||  M  /\  z  ||  N ) ) )  =  0 )
441, 4, 433eqtr4a 2229 . 2  |-  ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  ( M  =  0  /\  N  =  0 ) )  -> 
( M  gcd  N
)  =  ( iota_ d  e.  NN0  A. z  e.  ZZ  ( z  ||  d 
<->  ( z  ||  M  /\  z  ||  N ) ) ) )
45 bezoutlembi 11960 . . . . 5  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  E. r  e.  NN0  ( A. w  e.  ZZ  ( w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) )  /\  E. a  e.  ZZ  E. b  e.  ZZ  r  =  ( ( M  x.  a )  +  ( N  x.  b
) ) ) )
46 simpl 108 . . . . . 6  |-  ( ( A. w  e.  ZZ  ( w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) )  /\  E. a  e.  ZZ  E. b  e.  ZZ  r  =  ( ( M  x.  a )  +  ( N  x.  b
) ) )  ->  A. w  e.  ZZ  ( w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) ) )
4746reximi 2567 . . . . 5  |-  ( E. r  e.  NN0  ( A. w  e.  ZZ  ( w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) )  /\  E. a  e.  ZZ  E. b  e.  ZZ  r  =  ( ( M  x.  a )  +  ( N  x.  b
) ) )  ->  E. r  e.  NN0  A. w  e.  ZZ  (
w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) ) )
4845, 47syl 14 . . . 4  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  E. r  e.  NN0  A. w  e.  ZZ  (
w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) ) )
4948adantr 274 . . 3  |-  ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  -.  ( M  =  0  /\  N  =  0 ) )  ->  E. r  e.  NN0  A. w  e.  ZZ  (
w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) ) )
50 simplll 528 . . . . 5  |-  ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  -.  ( M  =  0  /\  N  =  0
) )  /\  (
r  e.  NN0  /\  A. w  e.  ZZ  (
w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) ) ) )  ->  M  e.  ZZ )
51 simpllr 529 . . . . 5  |-  ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  -.  ( M  =  0  /\  N  =  0
) )  /\  (
r  e.  NN0  /\  A. w  e.  ZZ  (
w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) ) ) )  ->  N  e.  ZZ )
52 simprl 526 . . . . 5  |-  ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  -.  ( M  =  0  /\  N  =  0
) )  /\  (
r  e.  NN0  /\  A. w  e.  ZZ  (
w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) ) ) )  ->  r  e.  NN0 )
53 breq1 3992 . . . . . . . . 9  |-  ( w  =  z  ->  (
w  ||  r  <->  z  ||  r ) )
54 breq1 3992 . . . . . . . . . 10  |-  ( w  =  z  ->  (
w  ||  M  <->  z  ||  M ) )
55 breq1 3992 . . . . . . . . . 10  |-  ( w  =  z  ->  (
w  ||  N  <->  z  ||  N ) )
5654, 55anbi12d 470 . . . . . . . . 9  |-  ( w  =  z  ->  (
( w  ||  M  /\  w  ||  N )  <-> 
( z  ||  M  /\  z  ||  N ) ) )
5753, 56bibi12d 234 . . . . . . . 8  |-  ( w  =  z  ->  (
( w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) )  <-> 
( z  ||  r  <->  ( z  ||  M  /\  z  ||  N ) ) ) )
5857cbvralv 2696 . . . . . . 7  |-  ( A. w  e.  ZZ  (
w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) )  <->  A. z  e.  ZZ  ( z  ||  r 
<->  ( z  ||  M  /\  z  ||  N ) ) )
5958biimpi 119 . . . . . 6  |-  ( A. w  e.  ZZ  (
w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) )  ->  A. z  e.  ZZ  ( z  ||  r  <->  ( z  ||  M  /\  z  ||  N ) ) )
6059ad2antll 488 . . . . 5  |-  ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  -.  ( M  =  0  /\  N  =  0
) )  /\  (
r  e.  NN0  /\  A. w  e.  ZZ  (
w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) ) ) )  ->  A. z  e.  ZZ  ( z  ||  r 
<->  ( z  ||  M  /\  z  ||  N ) ) )
61 simplr 525 . . . . 5  |-  ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  -.  ( M  =  0  /\  N  =  0
) )  /\  (
r  e.  NN0  /\  A. w  e.  ZZ  (
w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) ) ) )  ->  -.  ( M  =  0  /\  N  =  0 ) )
6250, 51, 52, 60, 61bezoutlemsup 11964 . . . 4  |-  ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  -.  ( M  =  0  /\  N  =  0
) )  /\  (
r  e.  NN0  /\  A. w  e.  ZZ  (
w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) ) ) )  ->  r  =  sup ( { z  e.  ZZ  |  ( z 
||  M  /\  z  ||  N ) } ,  RR ,  <  ) )
63 breq1 3992 . . . . . . . . 9  |-  ( w  =  z  ->  (
w  ||  d  <->  z  ||  d ) )
6463, 56bibi12d 234 . . . . . . . 8  |-  ( w  =  z  ->  (
( w  ||  d  <->  ( w  ||  M  /\  w  ||  N ) )  <-> 
( z  ||  d  <->  ( z  ||  M  /\  z  ||  N ) ) ) )
6564cbvralv 2696 . . . . . . 7  |-  ( A. w  e.  ZZ  (
w  ||  d  <->  ( w  ||  M  /\  w  ||  N ) )  <->  A. z  e.  ZZ  ( z  ||  d 
<->  ( z  ||  M  /\  z  ||  N ) ) )
6665a1i 9 . . . . . 6  |-  ( d  e.  NN0  ->  ( A. w  e.  ZZ  (
w  ||  d  <->  ( w  ||  M  /\  w  ||  N ) )  <->  A. z  e.  ZZ  ( z  ||  d 
<->  ( z  ||  M  /\  z  ||  N ) ) ) )
6766riotabiia 5826 . . . . 5  |-  ( iota_ d  e.  NN0  A. w  e.  ZZ  ( w  ||  d 
<->  ( w  ||  M  /\  w  ||  N ) ) )  =  (
iota_ d  e.  NN0  A. z  e.  ZZ  (
z  ||  d  <->  ( z  ||  M  /\  z  ||  N ) ) )
68 simprr 527 . . . . . 6  |-  ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  -.  ( M  =  0  /\  N  =  0
) )  /\  (
r  e.  NN0  /\  A. w  e.  ZZ  (
w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) ) ) )  ->  A. w  e.  ZZ  ( w  ||  r 
<->  ( w  ||  M  /\  w  ||  N ) ) )
6950, 51, 52, 68bezoutlemeu 11962 . . . . . . 7  |-  ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  -.  ( M  =  0  /\  N  =  0
) )  /\  (
r  e.  NN0  /\  A. w  e.  ZZ  (
w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) ) ) )  ->  E! d  e.  NN0  A. w  e.  ZZ  ( w  ||  d 
<->  ( w  ||  M  /\  w  ||  N ) ) )
70 breq2 3993 . . . . . . . . . 10  |-  ( d  =  r  ->  (
w  ||  d  <->  w  ||  r
) )
7170bibi1d 232 . . . . . . . . 9  |-  ( d  =  r  ->  (
( w  ||  d  <->  ( w  ||  M  /\  w  ||  N ) )  <-> 
( w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) ) ) )
7271ralbidv 2470 . . . . . . . 8  |-  ( d  =  r  ->  ( A. w  e.  ZZ  ( w  ||  d  <->  ( w  ||  M  /\  w  ||  N ) )  <->  A. w  e.  ZZ  ( w  ||  r 
<->  ( w  ||  M  /\  w  ||  N ) ) ) )
7372riota2 5831 . . . . . . 7  |-  ( ( r  e.  NN0  /\  E! d  e.  NN0  A. w  e.  ZZ  (
w  ||  d  <->  ( w  ||  M  /\  w  ||  N ) ) )  ->  ( A. w  e.  ZZ  ( w  ||  r 
<->  ( w  ||  M  /\  w  ||  N ) )  <->  ( iota_ d  e. 
NN0  A. w  e.  ZZ  ( w  ||  d  <->  ( w  ||  M  /\  w  ||  N ) ) )  =  r ) )
7452, 69, 73syl2anc 409 . . . . . 6  |-  ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  -.  ( M  =  0  /\  N  =  0
) )  /\  (
r  e.  NN0  /\  A. w  e.  ZZ  (
w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) ) ) )  ->  ( A. w  e.  ZZ  (
w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) )  <->  ( iota_ d  e.  NN0  A. w  e.  ZZ  ( w  ||  d 
<->  ( w  ||  M  /\  w  ||  N ) ) )  =  r ) )
7568, 74mpbid 146 . . . . 5  |-  ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  -.  ( M  =  0  /\  N  =  0
) )  /\  (
r  e.  NN0  /\  A. w  e.  ZZ  (
w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) ) ) )  ->  ( iota_ d  e.  NN0  A. w  e.  ZZ  ( w  ||  d 
<->  ( w  ||  M  /\  w  ||  N ) ) )  =  r )
7667, 75eqtr3id 2217 . . . 4  |-  ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  -.  ( M  =  0  /\  N  =  0
) )  /\  (
r  e.  NN0  /\  A. w  e.  ZZ  (
w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) ) ) )  ->  ( iota_ d  e.  NN0  A. z  e.  ZZ  ( z  ||  d 
<->  ( z  ||  M  /\  z  ||  N ) ) )  =  r )
77 gcdn0val 11916 . . . . 5  |-  ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  -.  ( M  =  0  /\  N  =  0 ) )  ->  ( M  gcd  N )  =  sup ( { z  e.  ZZ  |  ( z  ||  M  /\  z  ||  N
) } ,  RR ,  <  ) )
7877adantr 274 . . . 4  |-  ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  -.  ( M  =  0  /\  N  =  0
) )  /\  (
r  e.  NN0  /\  A. w  e.  ZZ  (
w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) ) ) )  ->  ( M  gcd  N )  =  sup ( { z  e.  ZZ  |  ( z  ||  M  /\  z  ||  N
) } ,  RR ,  <  ) )
7962, 76, 783eqtr4rd 2214 . . 3  |-  ( ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  -.  ( M  =  0  /\  N  =  0
) )  /\  (
r  e.  NN0  /\  A. w  e.  ZZ  (
w  ||  r  <->  ( w  ||  M  /\  w  ||  N ) ) ) )  ->  ( M  gcd  N )  =  (
iota_ d  e.  NN0  A. z  e.  ZZ  (
z  ||  d  <->  ( z  ||  M  /\  z  ||  N ) ) ) )
8049, 79rexlimddv 2592 . 2  |-  ( ( ( M  e.  ZZ  /\  N  e.  ZZ )  /\  -.  ( M  =  0  /\  N  =  0 ) )  ->  ( M  gcd  N )  =  ( iota_ d  e.  NN0  A. z  e.  ZZ  ( z  ||  d 
<->  ( z  ||  M  /\  z  ||  N ) ) ) )
81 gcdmndc 11899 . . 3  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  -> DECID  ( M  =  0  /\  N  =  0 ) )
82 exmiddc 831 . . 3  |-  (DECID  ( M  =  0  /\  N  =  0 )  -> 
( ( M  =  0  /\  N  =  0 )  \/  -.  ( M  =  0  /\  N  =  0
) ) )
8381, 82syl 14 . 2  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( ( M  =  0  /\  N  =  0 )  \/  -.  ( M  =  0  /\  N  =  0
) ) )
8444, 80, 83mpjaodan 793 1  |-  ( ( M  e.  ZZ  /\  N  e.  ZZ )  ->  ( M  gcd  N
)  =  ( iota_ d  e.  NN0  A. z  e.  ZZ  ( z  ||  d 
<->  ( z  ||  M  /\  z  ||  N ) ) ) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 103    <-> wb 104    \/ wo 703  DECID wdc 829    = wceq 1348    e. wcel 2141   A.wral 2448   E.wrex 2449   E!wreu 2450   {crab 2452   class class class wbr 3989   iota_crio 5808  (class class class)co 5853   supcsup 6959   RRcr 7773   0cc0 7774    + caddc 7777    x. cmul 7779    < clt 7954   NN0cn0 9135   ZZcz 9212    || cdvds 11749    gcd cgcd 11897
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 609  ax-in2 610  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-13 2143  ax-14 2144  ax-ext 2152  ax-coll 4104  ax-sep 4107  ax-nul 4115  ax-pow 4160  ax-pr 4194  ax-un 4418  ax-setind 4521  ax-iinf 4572  ax-cnex 7865  ax-resscn 7866  ax-1cn 7867  ax-1re 7868  ax-icn 7869  ax-addcl 7870  ax-addrcl 7871  ax-mulcl 7872  ax-mulrcl 7873  ax-addcom 7874  ax-mulcom 7875  ax-addass 7876  ax-mulass 7877  ax-distr 7878  ax-i2m1 7879  ax-0lt1 7880  ax-1rid 7881  ax-0id 7882  ax-rnegex 7883  ax-precex 7884  ax-cnre 7885  ax-pre-ltirr 7886  ax-pre-ltwlin 7887  ax-pre-lttrn 7888  ax-pre-apti 7889  ax-pre-ltadd 7890  ax-pre-mulgt0 7891  ax-pre-mulext 7892  ax-arch 7893  ax-caucvg 7894
This theorem depends on definitions:  df-bi 116  df-dc 830  df-3or 974  df-3an 975  df-tru 1351  df-fal 1354  df-nf 1454  df-sb 1756  df-eu 2022  df-mo 2023  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ne 2341  df-nel 2436  df-ral 2453  df-rex 2454  df-reu 2455  df-rmo 2456  df-rab 2457  df-v 2732  df-sbc 2956  df-csb 3050  df-dif 3123  df-un 3125  df-in 3127  df-ss 3134  df-nul 3415  df-if 3527  df-pw 3568  df-sn 3589  df-pr 3590  df-op 3592  df-uni 3797  df-int 3832  df-iun 3875  df-br 3990  df-opab 4051  df-mpt 4052  df-tr 4088  df-id 4278  df-po 4281  df-iso 4282  df-iord 4351  df-on 4353  df-ilim 4354  df-suc 4356  df-iom 4575  df-xp 4617  df-rel 4618  df-cnv 4619  df-co 4620  df-dm 4621  df-rn 4622  df-res 4623  df-ima 4624  df-iota 5160  df-fun 5200  df-fn 5201  df-f 5202  df-f1 5203  df-fo 5204  df-f1o 5205  df-fv 5206  df-riota 5809  df-ov 5856  df-oprab 5857  df-mpo 5858  df-1st 6119  df-2nd 6120  df-recs 6284  df-frec 6370  df-sup 6961  df-pnf 7956  df-mnf 7957  df-xr 7958  df-ltxr 7959  df-le 7960  df-sub 8092  df-neg 8093  df-reap 8494  df-ap 8501  df-div 8590  df-inn 8879  df-2 8937  df-3 8938  df-4 8939  df-n0 9136  df-z 9213  df-uz 9488  df-q 9579  df-rp 9611  df-fz 9966  df-fzo 10099  df-fl 10226  df-mod 10279  df-seqfrec 10402  df-exp 10476  df-cj 10806  df-re 10807  df-im 10808  df-rsqrt 10962  df-abs 10963  df-dvds 11750  df-gcd 11898
This theorem is referenced by:  bezout  11966
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