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Theorem recex 9655
Description: Existence of reciprocal of nonzero complex number. (Contributed by Eric Schmidt, 22-May-2007.)
Assertion
Ref Expression
recex  |-  ( ( A  e.  CC  /\  A  =/=  0 )  ->  E. x  e.  CC  ( A  x.  x
)  =  1 )
Distinct variable group:    x, A

Proof of Theorem recex
Dummy variables  y 
a  b are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 cnre 9088 . . 3  |-  ( A  e.  CC  ->  E. a  e.  RR  E. b  e.  RR  A  =  ( a  +  ( _i  x.  b ) ) )
2 recextlem2 9654 . . . . . . . . 9  |-  ( ( a  e.  RR  /\  b  e.  RR  /\  (
a  +  ( _i  x.  b ) )  =/=  0 )  -> 
( ( a  x.  a )  +  ( b  x.  b ) )  =/=  0 )
323expia 1156 . . . . . . . 8  |-  ( ( a  e.  RR  /\  b  e.  RR )  ->  ( ( a  +  ( _i  x.  b
) )  =/=  0  ->  ( ( a  x.  a )  +  ( b  x.  b ) )  =/=  0 ) )
4 remulcl 9076 . . . . . . . . . . . . 13  |-  ( ( a  e.  RR  /\  a  e.  RR )  ->  ( a  x.  a
)  e.  RR )
54anidms 628 . . . . . . . . . . . 12  |-  ( a  e.  RR  ->  (
a  x.  a )  e.  RR )
6 remulcl 9076 . . . . . . . . . . . . 13  |-  ( ( b  e.  RR  /\  b  e.  RR )  ->  ( b  x.  b
)  e.  RR )
76anidms 628 . . . . . . . . . . . 12  |-  ( b  e.  RR  ->  (
b  x.  b )  e.  RR )
8 readdcl 9074 . . . . . . . . . . . 12  |-  ( ( ( a  x.  a
)  e.  RR  /\  ( b  x.  b
)  e.  RR )  ->  ( ( a  x.  a )  +  ( b  x.  b
) )  e.  RR )
95, 7, 8syl2an 465 . . . . . . . . . . 11  |-  ( ( a  e.  RR  /\  b  e.  RR )  ->  ( ( a  x.  a )  +  ( b  x.  b ) )  e.  RR )
10 ax-rrecex 9063 . . . . . . . . . . 11  |-  ( ( ( ( a  x.  a )  +  ( b  x.  b ) )  e.  RR  /\  ( ( a  x.  a )  +  ( b  x.  b ) )  =/=  0 )  ->  E. y  e.  RR  ( ( ( a  x.  a )  +  ( b  x.  b
) )  x.  y
)  =  1 )
119, 10sylan 459 . . . . . . . . . 10  |-  ( ( ( a  e.  RR  /\  b  e.  RR )  /\  ( ( a  x.  a )  +  ( b  x.  b
) )  =/=  0
)  ->  E. y  e.  RR  ( ( ( a  x.  a )  +  ( b  x.  b ) )  x.  y )  =  1 )
12 recn 9081 . . . . . . . . . . . 12  |-  ( a  e.  RR  ->  a  e.  CC )
13 recn 9081 . . . . . . . . . . . 12  |-  ( b  e.  RR  ->  b  e.  CC )
14 recn 9081 . . . . . . . . . . . . . 14  |-  ( y  e.  RR  ->  y  e.  CC )
15 ax-icn 9050 . . . . . . . . . . . . . . . . . . . 20  |-  _i  e.  CC
16 mulcl 9075 . . . . . . . . . . . . . . . . . . . 20  |-  ( ( _i  e.  CC  /\  b  e.  CC )  ->  ( _i  x.  b
)  e.  CC )
1715, 16mpan 653 . . . . . . . . . . . . . . . . . . 19  |-  ( b  e.  CC  ->  (
_i  x.  b )  e.  CC )
18 subcl 9306 . . . . . . . . . . . . . . . . . . 19  |-  ( ( a  e.  CC  /\  ( _i  x.  b
)  e.  CC )  ->  ( a  -  ( _i  x.  b
) )  e.  CC )
1917, 18sylan2 462 . . . . . . . . . . . . . . . . . 18  |-  ( ( a  e.  CC  /\  b  e.  CC )  ->  ( a  -  (
_i  x.  b )
)  e.  CC )
20 mulcl 9075 . . . . . . . . . . . . . . . . . 18  |-  ( ( ( a  -  (
_i  x.  b )
)  e.  CC  /\  y  e.  CC )  ->  ( ( a  -  ( _i  x.  b
) )  x.  y
)  e.  CC )
2119, 20sylan 459 . . . . . . . . . . . . . . . . 17  |-  ( ( ( a  e.  CC  /\  b  e.  CC )  /\  y  e.  CC )  ->  ( ( a  -  ( _i  x.  b ) )  x.  y )  e.  CC )
2221adantr 453 . . . . . . . . . . . . . . . 16  |-  ( ( ( ( a  e.  CC  /\  b  e.  CC )  /\  y  e.  CC )  /\  (
( ( a  x.  a )  +  ( b  x.  b ) )  x.  y )  =  1 )  -> 
( ( a  -  ( _i  x.  b
) )  x.  y
)  e.  CC )
23 addcl 9073 . . . . . . . . . . . . . . . . . . . . 21  |-  ( ( a  e.  CC  /\  ( _i  x.  b
)  e.  CC )  ->  ( a  +  ( _i  x.  b
) )  e.  CC )
2417, 23sylan2 462 . . . . . . . . . . . . . . . . . . . 20  |-  ( ( a  e.  CC  /\  b  e.  CC )  ->  ( a  +  ( _i  x.  b ) )  e.  CC )
2524adantr 453 . . . . . . . . . . . . . . . . . . 19  |-  ( ( ( a  e.  CC  /\  b  e.  CC )  /\  y  e.  CC )  ->  ( a  +  ( _i  x.  b
) )  e.  CC )
2619adantr 453 . . . . . . . . . . . . . . . . . . 19  |-  ( ( ( a  e.  CC  /\  b  e.  CC )  /\  y  e.  CC )  ->  ( a  -  ( _i  x.  b
) )  e.  CC )
27 simpr 449 . . . . . . . . . . . . . . . . . . 19  |-  ( ( ( a  e.  CC  /\  b  e.  CC )  /\  y  e.  CC )  ->  y  e.  CC )
2825, 26, 27mulassd 9112 . . . . . . . . . . . . . . . . . 18  |-  ( ( ( a  e.  CC  /\  b  e.  CC )  /\  y  e.  CC )  ->  ( ( ( a  +  ( _i  x.  b ) )  x.  ( a  -  ( _i  x.  b
) ) )  x.  y )  =  ( ( a  +  ( _i  x.  b ) )  x.  ( ( a  -  ( _i  x.  b ) )  x.  y ) ) )
29 recextlem1 9653 . . . . . . . . . . . . . . . . . . . 20  |-  ( ( a  e.  CC  /\  b  e.  CC )  ->  ( ( a  +  ( _i  x.  b
) )  x.  (
a  -  ( _i  x.  b ) ) )  =  ( ( a  x.  a )  +  ( b  x.  b ) ) )
3029adantr 453 . . . . . . . . . . . . . . . . . . 19  |-  ( ( ( a  e.  CC  /\  b  e.  CC )  /\  y  e.  CC )  ->  ( ( a  +  ( _i  x.  b ) )  x.  ( a  -  (
_i  x.  b )
) )  =  ( ( a  x.  a
)  +  ( b  x.  b ) ) )
3130oveq1d 6097 . . . . . . . . . . . . . . . . . 18  |-  ( ( ( a  e.  CC  /\  b  e.  CC )  /\  y  e.  CC )  ->  ( ( ( a  +  ( _i  x.  b ) )  x.  ( a  -  ( _i  x.  b
) ) )  x.  y )  =  ( ( ( a  x.  a )  +  ( b  x.  b ) )  x.  y ) )
3228, 31eqtr3d 2471 . . . . . . . . . . . . . . . . 17  |-  ( ( ( a  e.  CC  /\  b  e.  CC )  /\  y  e.  CC )  ->  ( ( a  +  ( _i  x.  b ) )  x.  ( ( a  -  ( _i  x.  b
) )  x.  y
) )  =  ( ( ( a  x.  a )  +  ( b  x.  b ) )  x.  y ) )
33 id 21 . . . . . . . . . . . . . . . . 17  |-  ( ( ( ( a  x.  a )  +  ( b  x.  b ) )  x.  y )  =  1  ->  (
( ( a  x.  a )  +  ( b  x.  b ) )  x.  y )  =  1 )
3432, 33sylan9eq 2489 . . . . . . . . . . . . . . . 16  |-  ( ( ( ( a  e.  CC  /\  b  e.  CC )  /\  y  e.  CC )  /\  (
( ( a  x.  a )  +  ( b  x.  b ) )  x.  y )  =  1 )  -> 
( ( a  +  ( _i  x.  b
) )  x.  (
( a  -  (
_i  x.  b )
)  x.  y ) )  =  1 )
35 oveq2 6090 . . . . . . . . . . . . . . . . . 18  |-  ( x  =  ( ( a  -  ( _i  x.  b ) )  x.  y )  ->  (
( a  +  ( _i  x.  b ) )  x.  x )  =  ( ( a  +  ( _i  x.  b ) )  x.  ( ( a  -  ( _i  x.  b
) )  x.  y
) ) )
3635eqeq1d 2445 . . . . . . . . . . . . . . . . 17  |-  ( x  =  ( ( a  -  ( _i  x.  b ) )  x.  y )  ->  (
( ( a  +  ( _i  x.  b
) )  x.  x
)  =  1  <->  (
( a  +  ( _i  x.  b ) )  x.  ( ( a  -  ( _i  x.  b ) )  x.  y ) )  =  1 ) )
3736rspcev 3053 . . . . . . . . . . . . . . . 16  |-  ( ( ( ( a  -  ( _i  x.  b
) )  x.  y
)  e.  CC  /\  ( ( a  +  ( _i  x.  b
) )  x.  (
( a  -  (
_i  x.  b )
)  x.  y ) )  =  1 )  ->  E. x  e.  CC  ( ( a  +  ( _i  x.  b
) )  x.  x
)  =  1 )
3822, 34, 37syl2anc 644 . . . . . . . . . . . . . . 15  |-  ( ( ( ( a  e.  CC  /\  b  e.  CC )  /\  y  e.  CC )  /\  (
( ( a  x.  a )  +  ( b  x.  b ) )  x.  y )  =  1 )  ->  E. x  e.  CC  ( ( a  +  ( _i  x.  b
) )  x.  x
)  =  1 )
3938exp31 589 . . . . . . . . . . . . . 14  |-  ( ( a  e.  CC  /\  b  e.  CC )  ->  ( y  e.  CC  ->  ( ( ( ( a  x.  a )  +  ( b  x.  b ) )  x.  y )  =  1  ->  E. x  e.  CC  ( ( a  +  ( _i  x.  b
) )  x.  x
)  =  1 ) ) )
4014, 39syl5 31 . . . . . . . . . . . . 13  |-  ( ( a  e.  CC  /\  b  e.  CC )  ->  ( y  e.  RR  ->  ( ( ( ( a  x.  a )  +  ( b  x.  b ) )  x.  y )  =  1  ->  E. x  e.  CC  ( ( a  +  ( _i  x.  b
) )  x.  x
)  =  1 ) ) )
4140rexlimdv 2830 . . . . . . . . . . . 12  |-  ( ( a  e.  CC  /\  b  e.  CC )  ->  ( E. y  e.  RR  ( ( ( a  x.  a )  +  ( b  x.  b ) )  x.  y )  =  1  ->  E. x  e.  CC  ( ( a  +  ( _i  x.  b
) )  x.  x
)  =  1 ) )
4212, 13, 41syl2an 465 . . . . . . . . . . 11  |-  ( ( a  e.  RR  /\  b  e.  RR )  ->  ( E. y  e.  RR  ( ( ( a  x.  a )  +  ( b  x.  b ) )  x.  y )  =  1  ->  E. x  e.  CC  ( ( a  +  ( _i  x.  b
) )  x.  x
)  =  1 ) )
4342adantr 453 . . . . . . . . . 10  |-  ( ( ( a  e.  RR  /\  b  e.  RR )  /\  ( ( a  x.  a )  +  ( b  x.  b
) )  =/=  0
)  ->  ( E. y  e.  RR  (
( ( a  x.  a )  +  ( b  x.  b ) )  x.  y )  =  1  ->  E. x  e.  CC  ( ( a  +  ( _i  x.  b ) )  x.  x )  =  1 ) )
4411, 43mpd 15 . . . . . . . . 9  |-  ( ( ( a  e.  RR  /\  b  e.  RR )  /\  ( ( a  x.  a )  +  ( b  x.  b
) )  =/=  0
)  ->  E. x  e.  CC  ( ( a  +  ( _i  x.  b ) )  x.  x )  =  1 )
4544ex 425 . . . . . . . 8  |-  ( ( a  e.  RR  /\  b  e.  RR )  ->  ( ( ( a  x.  a )  +  ( b  x.  b
) )  =/=  0  ->  E. x  e.  CC  ( ( a  +  ( _i  x.  b
) )  x.  x
)  =  1 ) )
463, 45syld 43 . . . . . . 7  |-  ( ( a  e.  RR  /\  b  e.  RR )  ->  ( ( a  +  ( _i  x.  b
) )  =/=  0  ->  E. x  e.  CC  ( ( a  +  ( _i  x.  b
) )  x.  x
)  =  1 ) )
4746adantr 453 . . . . . 6  |-  ( ( ( a  e.  RR  /\  b  e.  RR )  /\  A  =  ( a  +  ( _i  x.  b ) ) )  ->  ( (
a  +  ( _i  x.  b ) )  =/=  0  ->  E. x  e.  CC  ( ( a  +  ( _i  x.  b ) )  x.  x )  =  1 ) )
48 neeq1 2610 . . . . . . 7  |-  ( A  =  ( a  +  ( _i  x.  b
) )  ->  ( A  =/=  0  <->  ( a  +  ( _i  x.  b ) )  =/=  0 ) )
4948adantl 454 . . . . . 6  |-  ( ( ( a  e.  RR  /\  b  e.  RR )  /\  A  =  ( a  +  ( _i  x.  b ) ) )  ->  ( A  =/=  0  <->  ( a  +  ( _i  x.  b
) )  =/=  0
) )
50 oveq1 6089 . . . . . . . . 9  |-  ( A  =  ( a  +  ( _i  x.  b
) )  ->  ( A  x.  x )  =  ( ( a  +  ( _i  x.  b ) )  x.  x ) )
5150eqeq1d 2445 . . . . . . . 8  |-  ( A  =  ( a  +  ( _i  x.  b
) )  ->  (
( A  x.  x
)  =  1  <->  (
( a  +  ( _i  x.  b ) )  x.  x )  =  1 ) )
5251rexbidv 2727 . . . . . . 7  |-  ( A  =  ( a  +  ( _i  x.  b
) )  ->  ( E. x  e.  CC  ( A  x.  x
)  =  1  <->  E. x  e.  CC  (
( a  +  ( _i  x.  b ) )  x.  x )  =  1 ) )
5352adantl 454 . . . . . 6  |-  ( ( ( a  e.  RR  /\  b  e.  RR )  /\  A  =  ( a  +  ( _i  x.  b ) ) )  ->  ( E. x  e.  CC  ( A  x.  x )  =  1  <->  E. x  e.  CC  ( ( a  +  ( _i  x.  b ) )  x.  x )  =  1 ) )
5447, 49, 533imtr4d 261 . . . . 5  |-  ( ( ( a  e.  RR  /\  b  e.  RR )  /\  A  =  ( a  +  ( _i  x.  b ) ) )  ->  ( A  =/=  0  ->  E. x  e.  CC  ( A  x.  x )  =  1 ) )
5554ex 425 . . . 4  |-  ( ( a  e.  RR  /\  b  e.  RR )  ->  ( A  =  ( a  +  ( _i  x.  b ) )  ->  ( A  =/=  0  ->  E. x  e.  CC  ( A  x.  x )  =  1 ) ) )
5655rexlimivv 2836 . . 3  |-  ( E. a  e.  RR  E. b  e.  RR  A  =  ( a  +  ( _i  x.  b
) )  ->  ( A  =/=  0  ->  E. x  e.  CC  ( A  x.  x )  =  1 ) )
571, 56syl 16 . 2  |-  ( A  e.  CC  ->  ( A  =/=  0  ->  E. x  e.  CC  ( A  x.  x )  =  1 ) )
5857imp 420 1  |-  ( ( A  e.  CC  /\  A  =/=  0 )  ->  E. x  e.  CC  ( A  x.  x
)  =  1 )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 178    /\ wa 360    = wceq 1653    e. wcel 1726    =/= wne 2600   E.wrex 2707  (class class class)co 6082   CCcc 8989   RRcr 8990   0cc0 8991   1c1 8992   _ici 8993    + caddc 8994    x. cmul 8996    - cmin 9292
This theorem is referenced by:  mulcand  9656  receu  9668
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1556  ax-5 1567  ax-17 1627  ax-9 1667  ax-8 1688  ax-13 1728  ax-14 1730  ax-6 1745  ax-7 1750  ax-11 1762  ax-12 1951  ax-ext 2418  ax-sep 4331  ax-nul 4339  ax-pow 4378  ax-pr 4404  ax-un 4702  ax-resscn 9048  ax-1cn 9049  ax-icn 9050  ax-addcl 9051  ax-addrcl 9052  ax-mulcl 9053  ax-mulrcl 9054  ax-mulcom 9055  ax-addass 9056  ax-mulass 9057  ax-distr 9058  ax-i2m1 9059  ax-1ne0 9060  ax-1rid 9061  ax-rnegex 9062  ax-rrecex 9063  ax-cnre 9064  ax-pre-lttri 9065  ax-pre-lttrn 9066  ax-pre-ltadd 9067  ax-pre-mulgt0 9068
This theorem depends on definitions:  df-bi 179  df-or 361  df-an 362  df-3or 938  df-3an 939  df-tru 1329  df-ex 1552  df-nf 1555  df-sb 1660  df-eu 2286  df-mo 2287  df-clab 2424  df-cleq 2430  df-clel 2433  df-nfc 2562  df-ne 2602  df-nel 2603  df-ral 2711  df-rex 2712  df-reu 2713  df-rab 2715  df-v 2959  df-sbc 3163  df-csb 3253  df-dif 3324  df-un 3326  df-in 3328  df-ss 3335  df-nul 3630  df-if 3741  df-pw 3802  df-sn 3821  df-pr 3822  df-op 3824  df-uni 4017  df-br 4214  df-opab 4268  df-mpt 4269  df-id 4499  df-po 4504  df-so 4505  df-xp 4885  df-rel 4886  df-cnv 4887  df-co 4888  df-dm 4889  df-rn 4890  df-res 4891  df-ima 4892  df-iota 5419  df-fun 5457  df-fn 5458  df-f 5459  df-f1 5460  df-fo 5461  df-f1o 5462  df-fv 5463  df-ov 6085  df-oprab 6086  df-mpt2 6087  df-riota 6550  df-er 6906  df-en 7111  df-dom 7112  df-sdom 7113  df-pnf 9123  df-mnf 9124  df-xr 9125  df-ltxr 9126  df-le 9127  df-sub 9294  df-neg 9295
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