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Theorem enqdc1 7303
Description: The equivalence relation for positive fractions is decidable. (Contributed by Jim Kingdon, 7-Sep-2019.)
Assertion
Ref Expression
enqdc1  |-  ( ( ( A  e.  N.  /\  B  e.  N. )  /\  C  e.  ( N.  X.  N. ) )  -> DECID  <. A ,  B >.  ~Q  C )

Proof of Theorem enqdc1
StepHypRef Expression
1 xp1st 6133 . . . 4  |-  ( C  e.  ( N.  X.  N. )  ->  ( 1st `  C )  e.  N. )
2 xp2nd 6134 . . . 4  |-  ( C  e.  ( N.  X.  N. )  ->  ( 2nd `  C )  e.  N. )
31, 2jca 304 . . 3  |-  ( C  e.  ( N.  X.  N. )  ->  ( ( 1st `  C )  e.  N.  /\  ( 2nd `  C )  e. 
N. ) )
4 enqdc 7302 . . 3  |-  ( ( ( A  e.  N.  /\  B  e.  N. )  /\  ( ( 1st `  C
)  e.  N.  /\  ( 2nd `  C )  e.  N. ) )  -> DECID  <. A ,  B >.  ~Q 
<. ( 1st `  C
) ,  ( 2nd `  C ) >. )
53, 4sylan2 284 . 2  |-  ( ( ( A  e.  N.  /\  B  e.  N. )  /\  C  e.  ( N.  X.  N. ) )  -> DECID  <. A ,  B >.  ~Q 
<. ( 1st `  C
) ,  ( 2nd `  C ) >. )
6 1st2nd2 6143 . . . . 5  |-  ( C  e.  ( N.  X.  N. )  ->  C  = 
<. ( 1st `  C
) ,  ( 2nd `  C ) >. )
76breq2d 3994 . . . 4  |-  ( C  e.  ( N.  X.  N. )  ->  ( <. A ,  B >.  ~Q  C  <->  <. A ,  B >.  ~Q  <. ( 1st `  C
) ,  ( 2nd `  C ) >. )
)
87dcbid 828 . . 3  |-  ( C  e.  ( N.  X.  N. )  ->  (DECID  <. A ,  B >.  ~Q  C  <-> DECID  <. A ,  B >.  ~Q  <. ( 1st `  C
) ,  ( 2nd `  C ) >. )
)
98adantl 275 . 2  |-  ( ( ( A  e.  N.  /\  B  e.  N. )  /\  C  e.  ( N.  X.  N. ) )  ->  (DECID 
<. A ,  B >.  ~Q  C  <-> DECID  <. A ,  B >.  ~Q 
<. ( 1st `  C
) ,  ( 2nd `  C ) >. )
)
105, 9mpbird 166 1  |-  ( ( ( A  e.  N.  /\  B  e.  N. )  /\  C  e.  ( N.  X.  N. ) )  -> DECID  <. A ,  B >.  ~Q  C )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    <-> wb 104  DECID wdc 824    e. wcel 2136   <.cop 3579   class class class wbr 3982    X. cxp 4602   ` cfv 5188   1stc1st 6106   2ndc2nd 6107   N.cnpi 7213    ~Q ceq 7220
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 604  ax-in2 605  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-13 2138  ax-14 2139  ax-ext 2147  ax-coll 4097  ax-sep 4100  ax-nul 4108  ax-pow 4153  ax-pr 4187  ax-un 4411  ax-setind 4514  ax-iinf 4565
This theorem depends on definitions:  df-bi 116  df-dc 825  df-3or 969  df-3an 970  df-tru 1346  df-fal 1349  df-nf 1449  df-sb 1751  df-eu 2017  df-mo 2018  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-ne 2337  df-ral 2449  df-rex 2450  df-reu 2451  df-rab 2453  df-v 2728  df-sbc 2952  df-csb 3046  df-dif 3118  df-un 3120  df-in 3122  df-ss 3129  df-nul 3410  df-pw 3561  df-sn 3582  df-pr 3583  df-op 3585  df-uni 3790  df-int 3825  df-iun 3868  df-br 3983  df-opab 4044  df-mpt 4045  df-tr 4081  df-id 4271  df-iord 4344  df-on 4346  df-suc 4349  df-iom 4568  df-xp 4610  df-rel 4611  df-cnv 4612  df-co 4613  df-dm 4614  df-rn 4615  df-res 4616  df-ima 4617  df-iota 5153  df-fun 5190  df-fn 5191  df-f 5192  df-f1 5193  df-fo 5194  df-f1o 5195  df-fv 5196  df-ov 5845  df-oprab 5846  df-mpo 5847  df-1st 6108  df-2nd 6109  df-recs 6273  df-irdg 6338  df-oadd 6388  df-omul 6389  df-ni 7245  df-mi 7247  df-enq 7288
This theorem is referenced by: (None)
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