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Theorem cru 8387
Description: The representation of complex numbers in terms of real and imaginary parts is unique. Proposition 10-1.3 of [Gleason] p. 130. (Contributed by NM, 9-May-1999.) (Proof shortened by Mario Carneiro, 27-May-2016.)
Assertion
Ref Expression
cru  |-  ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  -> 
( ( A  +  ( _i  x.  B
) )  =  ( C  +  ( _i  x.  D ) )  <-> 
( A  =  C  /\  B  =  D ) ) )

Proof of Theorem cru
StepHypRef Expression
1 simplrl 525 . . . . . . 7  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  C  e.  RR )
21recnd 7817 . . . . . 6  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  C  e.  CC )
3 simplll 523 . . . . . . 7  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  A  e.  RR )
43recnd 7817 . . . . . 6  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  A  e.  CC )
5 simpr 109 . . . . . . . 8  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  ( A  +  ( _i  x.  B
) )  =  ( C  +  ( _i  x.  D ) ) )
6 ax-icn 7738 . . . . . . . . . . 11  |-  _i  e.  CC
76a1i 9 . . . . . . . . . 10  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  _i  e.  CC )
8 simpllr 524 . . . . . . . . . . 11  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  B  e.  RR )
98recnd 7817 . . . . . . . . . 10  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  B  e.  CC )
107, 9mulcld 7809 . . . . . . . . 9  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  ( _i  x.  B )  e.  CC )
11 simplrr 526 . . . . . . . . . . 11  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  D  e.  RR )
1211recnd 7817 . . . . . . . . . 10  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  D  e.  CC )
137, 12mulcld 7809 . . . . . . . . 9  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  ( _i  x.  D )  e.  CC )
144, 10, 2, 13addsubeq4d 8147 . . . . . . . 8  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  ( ( A  +  ( _i  x.  B ) )  =  ( C  +  ( _i  x.  D ) )  <->  ( C  -  A )  =  ( ( _i  x.  B
)  -  ( _i  x.  D ) ) ) )
155, 14mpbid 146 . . . . . . 7  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  ( C  -  A )  =  ( ( _i  x.  B
)  -  ( _i  x.  D ) ) )
168, 11resubcld 8166 . . . . . . . . . . 11  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  ( B  -  D )  e.  RR )
177, 9, 12subdid 8199 . . . . . . . . . . . . 13  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  ( _i  x.  ( B  -  D
) )  =  ( ( _i  x.  B
)  -  ( _i  x.  D ) ) )
1817, 15eqtr4d 2176 . . . . . . . . . . . 12  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  ( _i  x.  ( B  -  D
) )  =  ( C  -  A ) )
191, 3resubcld 8166 . . . . . . . . . . . 12  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  ( C  -  A )  e.  RR )
2018, 19eqeltrd 2217 . . . . . . . . . . 11  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  ( _i  x.  ( B  -  D
) )  e.  RR )
21 rimul 8370 . . . . . . . . . . 11  |-  ( ( ( B  -  D
)  e.  RR  /\  ( _i  x.  ( B  -  D )
)  e.  RR )  ->  ( B  -  D )  =  0 )
2216, 20, 21syl2anc 409 . . . . . . . . . 10  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  ( B  -  D )  =  0 )
239, 12, 22subeq0d 8104 . . . . . . . . 9  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  B  =  D )
2423oveq2d 5797 . . . . . . . 8  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  ( _i  x.  B )  =  ( _i  x.  D ) )
2524oveq1d 5796 . . . . . . 7  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  ( ( _i  x.  B )  -  ( _i  x.  D
) )  =  ( ( _i  x.  D
)  -  ( _i  x.  D ) ) )
2613subidd 8084 . . . . . . 7  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  ( ( _i  x.  D )  -  ( _i  x.  D
) )  =  0 )
2715, 25, 263eqtrd 2177 . . . . . 6  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  ( C  -  A )  =  0 )
282, 4, 27subeq0d 8104 . . . . 5  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  C  =  A )
2928eqcomd 2146 . . . 4  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  A  =  C )
3029, 23jca 304 . . 3  |-  ( ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  /\  ( A  +  (
_i  x.  B )
)  =  ( C  +  ( _i  x.  D ) ) )  ->  ( A  =  C  /\  B  =  D ) )
3130ex 114 . 2  |-  ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  -> 
( ( A  +  ( _i  x.  B
) )  =  ( C  +  ( _i  x.  D ) )  ->  ( A  =  C  /\  B  =  D ) ) )
32 oveq2 5789 . . 3  |-  ( B  =  D  ->  (
_i  x.  B )  =  ( _i  x.  D ) )
33 oveq12 5790 . . 3  |-  ( ( A  =  C  /\  ( _i  x.  B
)  =  ( _i  x.  D ) )  ->  ( A  +  ( _i  x.  B
) )  =  ( C  +  ( _i  x.  D ) ) )
3432, 33sylan2 284 . 2  |-  ( ( A  =  C  /\  B  =  D )  ->  ( A  +  ( _i  x.  B ) )  =  ( C  +  ( _i  x.  D ) ) )
3531, 34impbid1 141 1  |-  ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( C  e.  RR  /\  D  e.  RR ) )  -> 
( ( A  +  ( _i  x.  B
) )  =  ( C  +  ( _i  x.  D ) )  <-> 
( A  =  C  /\  B  =  D ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    <-> wb 104    = wceq 1332    e. wcel 1481  (class class class)co 5781   CCcc 7641   RRcr 7642   0cc0 7643   _ici 7645    + caddc 7646    x. cmul 7648    - cmin 7956
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 1424  ax-7 1425  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-8 1483  ax-10 1484  ax-11 1485  ax-i12 1486  ax-bndl 1487  ax-4 1488  ax-13 1492  ax-14 1493  ax-17 1507  ax-i9 1511  ax-ial 1515  ax-i5r 1516  ax-ext 2122  ax-sep 4053  ax-pow 4105  ax-pr 4138  ax-un 4362  ax-setind 4459  ax-cnex 7734  ax-resscn 7735  ax-1cn 7736  ax-1re 7737  ax-icn 7738  ax-addcl 7739  ax-addrcl 7740  ax-mulcl 7741  ax-mulrcl 7742  ax-addcom 7743  ax-mulcom 7744  ax-addass 7745  ax-mulass 7746  ax-distr 7747  ax-i2m1 7748  ax-0lt1 7749  ax-1rid 7750  ax-0id 7751  ax-rnegex 7752  ax-precex 7753  ax-cnre 7754  ax-pre-ltirr 7755  ax-pre-lttrn 7757  ax-pre-apti 7758  ax-pre-ltadd 7759  ax-pre-mulgt0 7760
This theorem depends on definitions:  df-bi 116  df-3an 965  df-tru 1335  df-fal 1338  df-nf 1438  df-sb 1737  df-eu 2003  df-mo 2004  df-clab 2127  df-cleq 2133  df-clel 2136  df-nfc 2271  df-ne 2310  df-nel 2405  df-ral 2422  df-rex 2423  df-reu 2424  df-rab 2426  df-v 2691  df-sbc 2913  df-dif 3077  df-un 3079  df-in 3081  df-ss 3088  df-pw 3516  df-sn 3537  df-pr 3538  df-op 3540  df-uni 3744  df-br 3937  df-opab 3997  df-id 4222  df-xp 4552  df-rel 4553  df-cnv 4554  df-co 4555  df-dm 4556  df-iota 5095  df-fun 5132  df-fv 5138  df-riota 5737  df-ov 5784  df-oprab 5785  df-mpo 5786  df-pnf 7825  df-mnf 7826  df-ltxr 7828  df-sub 7958  df-neg 7959  df-reap 8360
This theorem is referenced by:  apreim  8388  apti  8407  creur  8740  creui  8741  cnref1o  9468  efieq  11476
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