Theorem recexap 8971

Description: Existence of reciprocal of nonzero complex number. (Contributed by Jim Kingdon, 20-Feb-2020.)

Assertion

Ref	Expression
recexap	|- ( ( A e. CC /\ A # 0 ) -> E. x e. CC ( A x. x ) = 1 )

Distinct variable group:   x, A

Proof of Theorem recexap

Dummy variables y a b are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		cnre 8312	. . 3 |- ( A e. CC -> E. a e. RR E. b e. RR A = ( a + ( _i x. b ) ) )
2		recexaplem2 8970	. . . . . . . . 9 |- ( ( a e. RR /\ b e. RR /\ ( a + ( _i x. b ) ) # 0 ) -> ( ( a x. a ) + ( b x. b ) ) # 0 )
3	2	3expia 1236	. . . . . . . 8 |- ( ( a e. RR /\ b e. RR ) -> ( ( a + ( _i x. b ) ) # 0 -> ( ( a x. a ) + ( b x. b ) ) # 0 ) )
4		remulcl 8297	. . . . . . . . . . . 12 |- ( ( a e. RR /\ a e. RR ) -> ( a x. a ) e. RR )
5	4	anidms 401	. . . . . . . . . . 11 |- ( a e. RR -> ( a x. a ) e. RR )
6		remulcl 8297	. . . . . . . . . . . 12 |- ( ( b e. RR /\ b e. RR ) -> ( b x. b ) e. RR )
7	6	anidms 401	. . . . . . . . . . 11 |- ( b e. RR -> ( b x. b ) e. RR )
8		readdcl 8295	. . . . . . . . . . 11 |- ( ( ( a x. a ) e. RR /\ ( b x. b ) e. RR ) -> ( ( a x. a ) + ( b x. b ) ) e. RR )
9	5, 7, 8	syl2an 289	. . . . . . . . . 10 |- ( ( a e. RR /\ b e. RR ) -> ( ( a x. a ) + ( b x. b ) ) e. RR )
10		0re 8316	. . . . . . . . . 10 |- 0 e. RR
11		apreap 8905	. . . . . . . . . 10 |- ( ( ( ( a x. a ) + ( b x. b ) ) e. RR /\ 0 e. RR ) -> ( ( ( a x. a ) + ( b x. b ) ) # 0 <-> ( ( a x. a ) + ( b x. b ) ) #ℝ 0 ) )
12	9, 10, 11	sylancl 417	. . . . . . . . 9 |- ( ( a e. RR /\ b e. RR ) -> ( ( ( a x. a ) + ( b x. b ) ) # 0 <-> ( ( a x. a ) + ( b x. b ) ) #ℝ 0 ) )
13		recexre 8896	. . . . . . . . . . . 12 |- ( ( ( ( a x. a ) + ( b x. b ) ) e. RR /\ ( ( a x. a ) + ( b x. b ) ) #ℝ 0 ) -> E. y e. RR ( ( ( a x. a ) + ( b x. b ) ) x. y ) = 1 )
14	9, 13	sylan 283	. . . . . . . . . . 11 |- ( ( ( a e. RR /\ b e. RR ) /\ ( ( a x. a ) + ( b x. b ) ) #ℝ 0 ) -> E. y e. RR ( ( ( a x. a ) + ( b x. b ) ) x. y ) = 1 )
15		recn 8302	. . . . . . . . . . . . 13 |- ( a e. RR -> a e. CC )
16		recn 8302	. . . . . . . . . . . . 13 |- ( b e. RR -> b e. CC )
17		recn 8302	. . . . . . . . . . . . . . 15 |- ( y e. RR -> y e. CC )
18		ax-icn 8264	. . . . . . . . . . . . . . . . . . . . 21 |- _i e. CC
19		mulcl 8296	. . . . . . . . . . . . . . . . . . . . 21 |- ( ( _i e. CC /\ b e. CC ) -> ( _i x. b ) e. CC )
20	18, 19	mpan 428	. . . . . . . . . . . . . . . . . . . 20 |- ( b e. CC -> ( _i x. b ) e. CC )
21		subcl 8515	. . . . . . . . . . . . . . . . . . . 20 |- ( ( a e. CC /\ ( _i x. b ) e. CC ) -> ( a - ( _i x. b ) ) e. CC )
22	20, 21	sylan2 286	. . . . . . . . . . . . . . . . . . 19 |- ( ( a e. CC /\ b e. CC ) -> ( a - ( _i x. b ) ) e. CC )
23		mulcl 8296	. . . . . . . . . . . . . . . . . . 19 |- ( ( ( a - ( _i x. b ) ) e. CC /\ y e. CC ) -> ( ( a - ( _i x. b ) ) x. y ) e. CC )
24	22, 23	sylan 283	. . . . . . . . . . . . . . . . . 18 |- ( ( ( a e. CC /\ b e. CC ) /\ y e. CC ) -> ( ( a - ( _i x. b ) ) x. y ) e. CC )
25	24	adantr 276	. . . . . . . . . . . . . . . . 17 |- ( ( ( ( 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 )
26		addcl 8294	. . . . . . . . . . . . . . . . . . . . . 22 |- ( ( a e. CC /\ ( _i x. b ) e. CC ) -> ( a + ( _i x. b ) ) e. CC )
27	20, 26	sylan2 286	. . . . . . . . . . . . . . . . . . . . 21 |- ( ( a e. CC /\ b e. CC ) -> ( a + ( _i x. b ) ) e. CC )
28	27	adantr 276	. . . . . . . . . . . . . . . . . . . 20 |- ( ( ( a e. CC /\ b e. CC ) /\ y e. CC ) -> ( a + ( _i x. b ) ) e. CC )
29	22	adantr 276	. . . . . . . . . . . . . . . . . . . 20 |- ( ( ( a e. CC /\ b e. CC ) /\ y e. CC ) -> ( a - ( _i x. b ) ) e. CC )
30		simpr 110	. . . . . . . . . . . . . . . . . . . 20 |- ( ( ( a e. CC /\ b e. CC ) /\ y e. CC ) -> y e. CC )
31	28, 29, 30	mulassd 8339	. . . . . . . . . . . . . . . . . . 19 |- ( ( ( 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 ) ) )
32		recextlem1 8969	. . . . . . . . . . . . . . . . . . . . 21 |- ( ( a e. CC /\ b e. CC ) -> ( ( a + ( _i x. b ) ) x. ( a - ( _i x. b ) ) ) = ( ( a x. a ) + ( b x. b ) ) )
33	32	adantr 276	. . . . . . . . . . . . . . . . . . . 20 |- ( ( ( a e. CC /\ b e. CC ) /\ y e. CC ) -> ( ( a + ( _i x. b ) ) x. ( a - ( _i x. b ) ) ) = ( ( a x. a ) + ( b x. b ) ) )
34	33	oveq1d 6090	. . . . . . . . . . . . . . . . . . 19 |- ( ( ( 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 ) )
35	31, 34	eqtr3d 2273	. . . . . . . . . . . . . . . . . 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 ) )
36		id 19	. . . . . . . . . . . . . . . . . 18 |- ( ( ( ( a x. a ) + ( b x. b ) ) x. y ) = 1 -> ( ( ( a x. a ) + ( b x. b ) ) x. y ) = 1 )
37	35, 36	sylan9eq 2291	. . . . . . . . . . . . . . . . 17 |- ( ( ( ( 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 )
38		oveq2 6083	. . . . . . . . . . . . . . . . . . 19 |- ( x = ( ( a - ( _i x. b ) ) x. y ) -> ( ( a + ( _i x. b ) ) x. x ) = ( ( a + ( _i x. b ) ) x. ( ( a - ( _i x. b ) ) x. y ) ) )
39	38	eqeq1d 2247	. . . . . . . . . . . . . . . . . 18 |- ( 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 ) )
40	39	rspcev 2929	. . . . . . . . . . . . . . . . 17 |- ( ( ( ( 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 )
41	25, 37, 40	syl2anc 415	. . . . . . . . . . . . . . . 16 |- ( ( ( ( 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 )
42	41	exp31 364	. . . . . . . . . . . . . . 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 ) ) )
43	17, 42	syl5 32	. . . . . . . . . . . . . 14 |- ( ( 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 ) ) )
44	43	rexlimdv 2667	. . . . . . . . . . . . 13 |- ( ( 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 ) )
45	15, 16, 44	syl2an 289	. . . . . . . . . . . 12 |- ( ( 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 ) )
46	45	adantr 276	. . . . . . . . . . 11 |- ( ( ( a e. RR /\ b e. RR ) /\ ( ( a x. a ) + ( b x. b ) ) #ℝ 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 ) )
47	14, 46	mpd 13	. . . . . . . . . 10 |- ( ( ( a e. RR /\ b e. RR ) /\ ( ( a x. a ) + ( b x. b ) ) #ℝ 0 ) -> E. x e. CC ( ( a + ( _i x. b ) ) x. x ) = 1 )
48	47	ex 115	. . . . . . . . 9 |- ( ( a e. RR /\ b e. RR ) -> ( ( ( a x. a ) + ( b x. b ) ) #ℝ 0 -> E. x e. CC ( ( a + ( _i x. b ) ) x. x ) = 1 ) )
49	12, 48	sylbid 150	. . . . . . . 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 ) )
50	3, 49	syld 45	. . . . . . 7 |- ( ( a e. RR /\ b e. RR ) -> ( ( a + ( _i x. b ) ) # 0 -> E. x e. CC ( ( a + ( _i x. b ) ) x. x ) = 1 ) )
51	50	adantr 276	. . . . . 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 ) )
52		breq1 4128	. . . . . . 7 |- ( A = ( a + ( _i x. b ) ) -> ( A # 0 <-> ( a + ( _i x. b ) ) # 0 ) )
53	52	adantl 277	. . . . . 6 |- ( ( ( a e. RR /\ b e. RR ) /\ A = ( a + ( _i x. b ) ) ) -> ( A # 0 <-> ( a + ( _i x. b ) ) # 0 ) )
54		oveq1 6082	. . . . . . . . 9 |- ( A = ( a + ( _i x. b ) ) -> ( A x. x ) = ( ( a + ( _i x. b ) ) x. x ) )
55	54	eqeq1d 2247	. . . . . . . 8 |- ( A = ( a + ( _i x. b ) ) -> ( ( A x. x ) = 1 <-> ( ( a + ( _i x. b ) ) x. x ) = 1 ) )
56	55	rexbidv 2551	. . . . . . 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 ) )
57	56	adantl 277	. . . . . 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 ) )
58	51, 53, 57	3imtr4d 203	. . . . 5 |- ( ( ( a e. RR /\ b e. RR ) /\ A = ( a + ( _i x. b ) ) ) -> ( A # 0 -> E. x e. CC ( A x. x ) = 1 ) )
59	58	ex 115	. . . 4 |- ( ( a e. RR /\ b e. RR ) -> ( A = ( a + ( _i x. b ) ) -> ( A # 0 -> E. x e. CC ( A x. x ) = 1 ) ) )
60	59	rexlimivv 2674	. . 3 |- ( E. a e. RR E. b e. RR A = ( a + ( _i x. b ) ) -> ( A # 0 -> E. x e. CC ( A x. x ) = 1 ) )
61	1, 60	syl 14	. 2 |- ( A e. CC -> ( A # 0 -> E. x e. CC ( A x. x ) = 1 ) )
62	61	imp 124	1 |- ( ( A e. CC /\ A # 0 ) -> E. x e. CC ( A x. x ) = 1 )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   = wceq 1402   e. wcel 2209   E.wrex 2529   class class class wbr 4125  (class class class)co 6075   CCcc 8167   RRcr 8168   0cc0 8169   1c1 8170   _ici 8171   + caddc 8172   x. cmul 8174   - cmin 8487   #_ℝ creap 8892   # cap 8899

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4244  ax-pow 4306  ax-pr 4341  ax-un 4573  ax-setind 4679  ax-cnex 8260  ax-resscn 8261  ax-1cn 8262  ax-1re 8263  ax-icn 8264  ax-addcl 8265  ax-addrcl 8266  ax-mulcl 8267  ax-mulrcl 8268  ax-addcom 8269  ax-mulcom 8270  ax-addass 8271  ax-mulass 8272  ax-distr 8273  ax-i2m1 8274  ax-0lt1 8275  ax-1rid 8276  ax-0id 8277  ax-rnegex 8278  ax-precex 8279  ax-cnre 8280  ax-pre-ltirr 8281  ax-pre-ltwlin 8282  ax-pre-lttrn 8283  ax-pre-apti 8284  ax-pre-ltadd 8285  ax-pre-mulgt0 8286  ax-pre-mulext 8287

This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-reu 2535  df-rab 2537  df-v 2823  df-sbc 3052  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-br 4126  df-opab 4188  df-id 4433  df-po 4436  df-iso 4437  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-iota 5332  df-fun 5374  df-fv 5380  df-riota 6028  df-ov 6078  df-oprab 6079  df-mpo 6080  df-pnf 8352  df-mnf 8353  df-xr 8354  df-ltxr 8355  df-le 8356  df-sub 8489  df-neg 8490  df-reap 8893  df-ap 8900

This theorem is referenced by:  mulap0  8972  mulcanapd  8979  receuap  8989  recapb  8991