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Theorem recex 9400
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 8834 . . 3  |-  ( A  e.  CC  ->  E. a  e.  RR  E. b  e.  RR  A  =  ( a  +  ( _i  x.  b ) ) )
2 recextlem2 9399 . . . . . . . . 9  |-  ( ( a  e.  RR  /\  b  e.  RR  /\  (
a  +  ( _i  x.  b ) )  =/=  0 )  -> 
( ( a  x.  a )  +  ( b  x.  b ) )  =/=  0 )
323expia 1153 . . . . . . . 8  |-  ( ( a  e.  RR  /\  b  e.  RR )  ->  ( ( a  +  ( _i  x.  b
) )  =/=  0  ->  ( ( a  x.  a )  +  ( b  x.  b ) )  =/=  0 ) )
4 remulcl 8822 . . . . . . . . . . . . 13  |-  ( ( a  e.  RR  /\  a  e.  RR )  ->  ( a  x.  a
)  e.  RR )
54anidms 626 . . . . . . . . . . . 12  |-  ( a  e.  RR  ->  (
a  x.  a )  e.  RR )
6 remulcl 8822 . . . . . . . . . . . . 13  |-  ( ( b  e.  RR  /\  b  e.  RR )  ->  ( b  x.  b
)  e.  RR )
76anidms 626 . . . . . . . . . . . 12  |-  ( b  e.  RR  ->  (
b  x.  b )  e.  RR )
8 readdcl 8820 . . . . . . . . . . . 12  |-  ( ( ( a  x.  a
)  e.  RR  /\  ( b  x.  b
)  e.  RR )  ->  ( ( a  x.  a )  +  ( b  x.  b
) )  e.  RR )
95, 7, 8syl2an 463 . . . . . . . . . . 11  |-  ( ( a  e.  RR  /\  b  e.  RR )  ->  ( ( a  x.  a )  +  ( b  x.  b ) )  e.  RR )
10 ax-rrecex 8809 . . . . . . . . . . 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 457 . . . . . . . . . 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 8827 . . . . . . . . . . . 12  |-  ( a  e.  RR  ->  a  e.  CC )
13 recn 8827 . . . . . . . . . . . 12  |-  ( b  e.  RR  ->  b  e.  CC )
14 recn 8827 . . . . . . . . . . . . . 14  |-  ( y  e.  RR  ->  y  e.  CC )
15 ax-icn 8796 . . . . . . . . . . . . . . . . . . . 20  |-  _i  e.  CC
16 mulcl 8821 . . . . . . . . . . . . . . . . . . . 20  |-  ( ( _i  e.  CC  /\  b  e.  CC )  ->  ( _i  x.  b
)  e.  CC )
1715, 16mpan 651 . . . . . . . . . . . . . . . . . . 19  |-  ( b  e.  CC  ->  (
_i  x.  b )  e.  CC )
18 subcl 9051 . . . . . . . . . . . . . . . . . . 19  |-  ( ( a  e.  CC  /\  ( _i  x.  b
)  e.  CC )  ->  ( a  -  ( _i  x.  b
) )  e.  CC )
1917, 18sylan2 460 . . . . . . . . . . . . . . . . . 18  |-  ( ( a  e.  CC  /\  b  e.  CC )  ->  ( a  -  (
_i  x.  b )
)  e.  CC )
20 mulcl 8821 . . . . . . . . . . . . . . . . . 18  |-  ( ( ( a  -  (
_i  x.  b )
)  e.  CC  /\  y  e.  CC )  ->  ( ( a  -  ( _i  x.  b
) )  x.  y
)  e.  CC )
2119, 20sylan 457 . . . . . . . . . . . . . . . . 17  |-  ( ( ( a  e.  CC  /\  b  e.  CC )  /\  y  e.  CC )  ->  ( ( a  -  ( _i  x.  b ) )  x.  y )  e.  CC )
2221adantr 451 . . . . . . . . . . . . . . . 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 8819 . . . . . . . . . . . . . . . . . . . . 21  |-  ( ( a  e.  CC  /\  ( _i  x.  b
)  e.  CC )  ->  ( a  +  ( _i  x.  b
) )  e.  CC )
2417, 23sylan2 460 . . . . . . . . . . . . . . . . . . . 20  |-  ( ( a  e.  CC  /\  b  e.  CC )  ->  ( a  +  ( _i  x.  b ) )  e.  CC )
2524adantr 451 . . . . . . . . . . . . . . . . . . 19  |-  ( ( ( a  e.  CC  /\  b  e.  CC )  /\  y  e.  CC )  ->  ( a  +  ( _i  x.  b
) )  e.  CC )
2619adantr 451 . . . . . . . . . . . . . . . . . . 19  |-  ( ( ( a  e.  CC  /\  b  e.  CC )  /\  y  e.  CC )  ->  ( a  -  ( _i  x.  b
) )  e.  CC )
27 simpr 447 . . . . . . . . . . . . . . . . . . 19  |-  ( ( ( a  e.  CC  /\  b  e.  CC )  /\  y  e.  CC )  ->  y  e.  CC )
2825, 26, 27mulassd 8858 . . . . . . . . . . . . . . . . . 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 9398 . . . . . . . . . . . . . . . . . . . 20  |-  ( ( a  e.  CC  /\  b  e.  CC )  ->  ( ( a  +  ( _i  x.  b
) )  x.  (
a  -  ( _i  x.  b ) ) )  =  ( ( a  x.  a )  +  ( b  x.  b ) ) )
3029adantr 451 . . . . . . . . . . . . . . . . . . 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 5873 . . . . . . . . . . . . . . . . . 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 2317 . . . . . . . . . . . . . . . . 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 19 . . . . . . . . . . . . . . . . 17  |-  ( ( ( ( a  x.  a )  +  ( b  x.  b ) )  x.  y )  =  1  ->  (
( ( a  x.  a )  +  ( b  x.  b ) )  x.  y )  =  1 )
3432, 33sylan9eq 2335 . . . . . . . . . . . . . . . 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 5866 . . . . . . . . . . . . . . . . . 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 2291 . . . . . . . . . . . . . . . . 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 2884 . . . . . . . . . . . . . . . 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 642 . . . . . . . . . . . . . . 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 587 . . . . . . . . . . . . . 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 28 . . . . . . . . . . . . 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 2666 . . . . . . . . . . . 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 463 . . . . . . . . . . 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 451 . . . . . . . . . 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 14 . . . . . . . . 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 423 . . . . . . . 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 40 . . . . . . 7  |-  ( ( a  e.  RR  /\  b  e.  RR )  ->  ( ( a  +  ( _i  x.  b
) )  =/=  0  ->  E. x  e.  CC  ( ( a  +  ( _i  x.  b
) )  x.  x
)  =  1 ) )
4746adantr 451 . . . . . 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 2454 . . . . . . 7  |-  ( A  =  ( a  +  ( _i  x.  b
) )  ->  ( A  =/=  0  <->  ( a  +  ( _i  x.  b ) )  =/=  0 ) )
4948adantl 452 . . . . . 6  |-  ( ( ( a  e.  RR  /\  b  e.  RR )  /\  A  =  ( a  +  ( _i  x.  b ) ) )  ->  ( A  =/=  0  <->  ( a  +  ( _i  x.  b
) )  =/=  0
) )
50 oveq1 5865 . . . . . . . . 9  |-  ( A  =  ( a  +  ( _i  x.  b
) )  ->  ( A  x.  x )  =  ( ( a  +  ( _i  x.  b ) )  x.  x ) )
5150eqeq1d 2291 . . . . . . . 8  |-  ( A  =  ( a  +  ( _i  x.  b
) )  ->  (
( A  x.  x
)  =  1  <->  (
( a  +  ( _i  x.  b ) )  x.  x )  =  1 ) )
5251rexbidv 2564 . . . . . . 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 452 . . . . . 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 259 . . . . 5  |-  ( ( ( a  e.  RR  /\  b  e.  RR )  /\  A  =  ( a  +  ( _i  x.  b ) ) )  ->  ( A  =/=  0  ->  E. x  e.  CC  ( A  x.  x )  =  1 ) )
5554ex 423 . . . 4  |-  ( ( a  e.  RR  /\  b  e.  RR )  ->  ( A  =  ( a  +  ( _i  x.  b ) )  ->  ( A  =/=  0  ->  E. x  e.  CC  ( A  x.  x )  =  1 ) ) )
5655rexlimivv 2672 . . 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 15 . 2  |-  ( A  e.  CC  ->  ( A  =/=  0  ->  E. x  e.  CC  ( A  x.  x )  =  1 ) )
5857imp 418 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 176    /\ wa 358    = wceq 1623    e. wcel 1684    =/= wne 2446   E.wrex 2544  (class class class)co 5858   CCcc 8735   RRcr 8736   0cc0 8737   1c1 8738   _ici 8739    + caddc 8740    x. cmul 8742    - cmin 9037
This theorem is referenced by:  mulcand  9401  receu  9413
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-13 1686  ax-14 1688  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866  ax-ext 2264  ax-sep 4141  ax-nul 4149  ax-pow 4188  ax-pr 4214  ax-un 4512  ax-resscn 8794  ax-1cn 8795  ax-icn 8796  ax-addcl 8797  ax-addrcl 8798  ax-mulcl 8799  ax-mulrcl 8800  ax-mulcom 8801  ax-addass 8802  ax-mulass 8803  ax-distr 8804  ax-i2m1 8805  ax-1ne0 8806  ax-1rid 8807  ax-rnegex 8808  ax-rrecex 8809  ax-cnre 8810  ax-pre-lttri 8811  ax-pre-lttrn 8812  ax-pre-ltadd 8813  ax-pre-mulgt0 8814
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-tru 1310  df-ex 1529  df-nf 1532  df-sb 1630  df-eu 2147  df-mo 2148  df-clab 2270  df-cleq 2276  df-clel 2279  df-nfc 2408  df-ne 2448  df-nel 2449  df-ral 2548  df-rex 2549  df-reu 2550  df-rab 2552  df-v 2790  df-sbc 2992  df-csb 3082  df-dif 3155  df-un 3157  df-in 3159  df-ss 3166  df-nul 3456  df-if 3566  df-pw 3627  df-sn 3646  df-pr 3647  df-op 3649  df-uni 3828  df-br 4024  df-opab 4078  df-mpt 4079  df-id 4309  df-po 4314  df-so 4315  df-xp 4695  df-rel 4696  df-cnv 4697  df-co 4698  df-dm 4699  df-rn 4700  df-res 4701  df-ima 4702  df-iota 5219  df-fun 5257  df-fn 5258  df-f 5259  df-f1 5260  df-fo 5261  df-f1o 5262  df-fv 5263  df-ov 5861  df-oprab 5862  df-mpt2 5863  df-riota 6304  df-er 6660  df-en 6864  df-dom 6865  df-sdom 6866  df-pnf 8869  df-mnf 8870  df-xr 8871  df-ltxr 8872  df-le 8873  df-sub 9039  df-neg 9040
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