Theorem cjth 10810

Description: The defining property of the complex conjugate. (Contributed by Mario Carneiro, 6-Nov-2013.)

Assertion

Ref	Expression
cjth	|- ( A e. CC -> ( ( A + ( * ` A ) ) e. RR /\ ( _i x. ( A - ( * ` A ) ) ) e. RR ) )

Proof of Theorem cjth

Dummy variable x is distinct from all other variables.

Step	Hyp	Ref	Expression
1		cju 8877	. . . 4 |- ( A e. CC -> E! x e. CC ( ( A + x ) e. RR /\ ( _i x. ( A - x ) ) e. RR ) )
2		riotasbc 5824	. . . 4 |- ( E! x e. CC ( ( A + x ) e. RR /\ ( _i x. ( A - x ) ) e. RR ) -> [. ( iota_ x e. CC ( ( A + x ) e. RR /\ ( _i x. ( A - x ) ) e. RR ) ) / x ]. ( ( A + x ) e. RR /\ ( _i x. ( A - x ) ) e. RR ) )
3	1, 2	syl 14	. . 3 |- ( A e. CC -> [. ( iota_ x e. CC ( ( A + x ) e. RR /\ ( _i x. ( A - x ) ) e. RR ) ) / x ]. ( ( A + x ) e. RR /\ ( _i x. ( A - x ) ) e. RR ) )
4		cjval 10809	. . . 4 |- ( A e. CC -> ( * ` A ) = ( iota_ x e. CC ( ( A + x ) e. RR /\ ( _i x. ( A - x ) ) e. RR ) ) )
5	4	sbceq1d 2960	. . 3 |- ( A e. CC -> ( [. ( * ` A ) / x ]. ( ( A + x ) e. RR /\ ( _i x. ( A - x ) ) e. RR ) <-> [. ( iota_ x e. CC ( ( A + x ) e. RR /\ ( _i x. ( A - x ) ) e. RR ) ) / x ]. ( ( A + x ) e. RR /\ ( _i x. ( A - x ) ) e. RR ) ) )
6	3, 5	mpbird 166	. 2 |- ( A e. CC -> [. ( * ` A ) / x ]. ( ( A + x ) e. RR /\ ( _i x. ( A - x ) ) e. RR ) )
7		riotacl 5823	. . . . 5 |- ( E! x e. CC ( ( A + x ) e. RR /\ ( _i x. ( A - x ) ) e. RR ) -> ( iota_ x e. CC ( ( A + x ) e. RR /\ ( _i x. ( A - x ) ) e. RR ) ) e. CC )
8	1, 7	syl 14	. . . 4 |- ( A e. CC -> ( iota_ x e. CC ( ( A + x ) e. RR /\ ( _i x. ( A - x ) ) e. RR ) ) e. CC )
9	4, 8	eqeltrd 2247	. . 3 |- ( A e. CC -> ( * ` A ) e. CC )
10		oveq2 5861	. . . . . 6 |- ( x = ( * ` A ) -> ( A + x ) = ( A + ( * ` A ) ) )
11	10	eleq1d 2239	. . . . 5 |- ( x = ( * ` A ) -> ( ( A + x ) e. RR <-> ( A + ( * ` A ) ) e. RR ) )
12		oveq2 5861	. . . . . . 7 |- ( x = ( * ` A ) -> ( A - x ) = ( A - ( * ` A ) ) )
13	12	oveq2d 5869	. . . . . 6 |- ( x = ( * ` A ) -> ( _i x. ( A - x ) ) = ( _i x. ( A - ( * ` A ) ) ) )
14	13	eleq1d 2239	. . . . 5 |- ( x = ( * ` A ) -> ( ( _i x. ( A - x ) ) e. RR <-> ( _i x. ( A - ( * ` A ) ) ) e. RR ) )
15	11, 14	anbi12d 470	. . . 4 |- ( x = ( * ` A ) -> ( ( ( A + x ) e. RR /\ ( _i x. ( A - x ) ) e. RR ) <-> ( ( A + ( * ` A ) ) e. RR /\ ( _i x. ( A - ( * ` A ) ) ) e. RR ) ) )
16	15	sbcieg 2987	. . 3 |- ( ( * ` A ) e. CC -> ( [. ( * ` A ) / x ]. ( ( A + x ) e. RR /\ ( _i x. ( A - x ) ) e. RR ) <-> ( ( A + ( * ` A ) ) e. RR /\ ( _i x. ( A - ( * ` A ) ) ) e. RR ) ) )
17	9, 16	syl 14	. 2 |- ( A e. CC -> ( [. ( * ` A ) / x ]. ( ( A + x ) e. RR /\ ( _i x. ( A - x ) ) e. RR ) <-> ( ( A + ( * ` A ) ) e. RR /\ ( _i x. ( A - ( * ` A ) ) ) e. RR ) ) )
18	6, 17	mpbid 146	1 |- ( A e. CC -> ( ( A + ( * ` A ) ) e. RR /\ ( _i x. ( A - ( * ` A ) ) ) e. RR ) )

Syntax hints:   -> wi 4   /\ wa 103   <-> wb 104   = wceq 1348   e. wcel 2141   E!wreu 2450   [.wsbc 2955   ` cfv 5198   iota_crio 5808  (class class class)co 5853   CCcc 7772   RRcr 7773   _ici 7776   + caddc 7777   x. cmul 7779   - cmin 8090   *ccj 10803

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-sep 4107  ax-pow 4160  ax-pr 4194  ax-un 4418  ax-setind 4521  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-lttrn 7888  ax-pre-apti 7889  ax-pre-ltadd 7890  ax-pre-mulgt0 7891

This theorem depends on definitions:  df-bi 116  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-dif 3123  df-un 3125  df-in 3127  df-ss 3134  df-pw 3568  df-sn 3589  df-pr 3590  df-op 3592  df-uni 3797  df-br 3990  df-opab 4051  df-mpt 4052  df-id 4278  df-xp 4617  df-rel 4618  df-cnv 4619  df-co 4620  df-dm 4621  df-iota 5160  df-fun 5200  df-fv 5206  df-riota 5809  df-ov 5856  df-oprab 5857  df-mpo 5858  df-pnf 7956  df-mnf 7957  df-ltxr 7959  df-sub 8092  df-neg 8093  df-reap 8494  df-cj 10806

This theorem is referenced by:  recl  10817  crre  10821