Theorem plycjOLD 26183

Description: Obsolete version of plycj 26181 as of 22-Sep-2025. The double conjugation of a polynomial is a polynomial. (The single conjugation is not because our definition of polynomial includes only holomorphic functions, i.e. no dependence on (∗‘𝑧) independently of 𝑧.) (Contributed by Mario Carneiro, 24-Jul-2014.) (New usage is discouraged.) (Proof modification is discouraged.)

Hypotheses

Ref	Expression
plycjOLD.1	⊢ 𝑁 = (deg‘𝐹)
plycjOLD.2	⊢ 𝐺 = ((∗ ∘ 𝐹) ∘ ∗)
plycjOLD.3	⊢ ((𝜑 ∧ 𝑥 ∈ 𝑆) → (∗‘𝑥) ∈ 𝑆)
plycjOLD.4	⊢ (𝜑 → 𝐹 ∈ (Poly‘𝑆))

Assertion

Ref	Expression
plycjOLD	⊢ (𝜑 → 𝐺 ∈ (Poly‘𝑆))

Distinct variable groups:   𝑥,𝐹   𝑥,𝑁   𝜑,𝑥   𝑥,𝑆

Allowed substitution hint:   𝐺(𝑥)

Proof of Theorem plycjOLD

Dummy variables 𝑘 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		plycjOLD.4	. . . 4 ⊢ (𝜑 → 𝐹 ∈ (Poly‘𝑆))
2		plycjOLD.1	. . . . 5 ⊢ 𝑁 = (deg‘𝐹)
3		plycjOLD.2	. . . . 5 ⊢ 𝐺 = ((∗ ∘ 𝐹) ∘ ∗)
4		eqid 2729	. . . . 5 ⊢ (coeff‘𝐹) = (coeff‘𝐹)
5	2, 3, 4	plycjlem 26180	. . . 4 ⊢ (𝐹 ∈ (Poly‘𝑆) → 𝐺 = (𝑧 ∈ ℂ ↦ Σ𝑘 ∈ (0...𝑁)(((∗ ∘ (coeff‘𝐹))‘𝑘) · (𝑧↑𝑘))))
6	1, 5	syl 17	. . 3 ⊢ (𝜑 → 𝐺 = (𝑧 ∈ ℂ ↦ Σ𝑘 ∈ (0...𝑁)(((∗ ∘ (coeff‘𝐹))‘𝑘) · (𝑧↑𝑘))))
7		plybss 26097	. . . . . 6 ⊢ (𝐹 ∈ (Poly‘𝑆) → 𝑆 ⊆ ℂ)
8	1, 7	syl 17	. . . . 5 ⊢ (𝜑 → 𝑆 ⊆ ℂ)
9		0cnd 11108	. . . . . 6 ⊢ (𝜑 → 0 ∈ ℂ)
10	9	snssd 4760	. . . . 5 ⊢ (𝜑 → {0} ⊆ ℂ)
11	8, 10	unssd 4143	. . . 4 ⊢ (𝜑 → (𝑆 ∪ {0}) ⊆ ℂ)
12		dgrcl 26136	. . . . . 6 ⊢ (𝐹 ∈ (Poly‘𝑆) → (deg‘𝐹) ∈ ℕ0)
13	1, 12	syl 17	. . . . 5 ⊢ (𝜑 → (deg‘𝐹) ∈ ℕ0)
14	2, 13	eqeltrid 2832	. . . 4 ⊢ (𝜑 → 𝑁 ∈ ℕ0)
15	4	coef 26133	. . . . . . 7 ⊢ (𝐹 ∈ (Poly‘𝑆) → (coeff‘𝐹):ℕ0⟶(𝑆 ∪ {0}))
16	1, 15	syl 17	. . . . . 6 ⊢ (𝜑 → (coeff‘𝐹):ℕ0⟶(𝑆 ∪ {0}))
17		elfznn0 13523	. . . . . 6 ⊢ (𝑘 ∈ (0...𝑁) → 𝑘 ∈ ℕ0)
18		fvco3 6922	. . . . . 6 ⊢ (((coeff‘𝐹):ℕ0⟶(𝑆 ∪ {0}) ∧ 𝑘 ∈ ℕ0) → ((∗ ∘ (coeff‘𝐹))‘𝑘) = (∗‘((coeff‘𝐹)‘𝑘)))
19	16, 17, 18	syl2an 596	. . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → ((∗ ∘ (coeff‘𝐹))‘𝑘) = (∗‘((coeff‘𝐹)‘𝑘)))
20		ffvelcdm 7015	. . . . . . 7 ⊢ (((coeff‘𝐹):ℕ0⟶(𝑆 ∪ {0}) ∧ 𝑘 ∈ ℕ0) → ((coeff‘𝐹)‘𝑘) ∈ (𝑆 ∪ {0}))
21	16, 17, 20	syl2an 596	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → ((coeff‘𝐹)‘𝑘) ∈ (𝑆 ∪ {0}))
22		plycjOLD.3	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑆) → (∗‘𝑥) ∈ 𝑆)
23	22	ralrimiva 3121	. . . . . . . . . 10 ⊢ (𝜑 → ∀𝑥 ∈ 𝑆 (∗‘𝑥) ∈ 𝑆)
24		fveq2 6822	. . . . . . . . . . . 12 ⊢ (𝑥 = ((coeff‘𝐹)‘𝑘) → (∗‘𝑥) = (∗‘((coeff‘𝐹)‘𝑘)))
25	24	eleq1d 2813	. . . . . . . . . . 11 ⊢ (𝑥 = ((coeff‘𝐹)‘𝑘) → ((∗‘𝑥) ∈ 𝑆 ↔ (∗‘((coeff‘𝐹)‘𝑘)) ∈ 𝑆))
26	25	rspccv 3574	. . . . . . . . . 10 ⊢ (∀𝑥 ∈ 𝑆 (∗‘𝑥) ∈ 𝑆 → (((coeff‘𝐹)‘𝑘) ∈ 𝑆 → (∗‘((coeff‘𝐹)‘𝑘)) ∈ 𝑆))
27	23, 26	syl 17	. . . . . . . . 9 ⊢ (𝜑 → (((coeff‘𝐹)‘𝑘) ∈ 𝑆 → (∗‘((coeff‘𝐹)‘𝑘)) ∈ 𝑆))
28		elsni 4594	. . . . . . . . . . . . 13 ⊢ (((coeff‘𝐹)‘𝑘) ∈ {0} → ((coeff‘𝐹)‘𝑘) = 0)
29	28	fveq2d 6826	. . . . . . . . . . . 12 ⊢ (((coeff‘𝐹)‘𝑘) ∈ {0} → (∗‘((coeff‘𝐹)‘𝑘)) = (∗‘0))
30		cj0 15065	. . . . . . . . . . . 12 ⊢ (∗‘0) = 0
31	29, 30	eqtrdi 2780	. . . . . . . . . . 11 ⊢ (((coeff‘𝐹)‘𝑘) ∈ {0} → (∗‘((coeff‘𝐹)‘𝑘)) = 0)
32		fvex 6835	. . . . . . . . . . . 12 ⊢ (∗‘((coeff‘𝐹)‘𝑘)) ∈ V
33	32	elsn 4592	. . . . . . . . . . 11 ⊢ ((∗‘((coeff‘𝐹)‘𝑘)) ∈ {0} ↔ (∗‘((coeff‘𝐹)‘𝑘)) = 0)
34	31, 33	sylibr 234	. . . . . . . . . 10 ⊢ (((coeff‘𝐹)‘𝑘) ∈ {0} → (∗‘((coeff‘𝐹)‘𝑘)) ∈ {0})
35	34	a1i 11	. . . . . . . . 9 ⊢ (𝜑 → (((coeff‘𝐹)‘𝑘) ∈ {0} → (∗‘((coeff‘𝐹)‘𝑘)) ∈ {0}))
36	27, 35	orim12d 966	. . . . . . . 8 ⊢ (𝜑 → ((((coeff‘𝐹)‘𝑘) ∈ 𝑆 ∨ ((coeff‘𝐹)‘𝑘) ∈ {0}) → ((∗‘((coeff‘𝐹)‘𝑘)) ∈ 𝑆 ∨ (∗‘((coeff‘𝐹)‘𝑘)) ∈ {0})))
37		elun 4104	. . . . . . . 8 ⊢ (((coeff‘𝐹)‘𝑘) ∈ (𝑆 ∪ {0}) ↔ (((coeff‘𝐹)‘𝑘) ∈ 𝑆 ∨ ((coeff‘𝐹)‘𝑘) ∈ {0}))
38		elun 4104	. . . . . . . 8 ⊢ ((∗‘((coeff‘𝐹)‘𝑘)) ∈ (𝑆 ∪ {0}) ↔ ((∗‘((coeff‘𝐹)‘𝑘)) ∈ 𝑆 ∨ (∗‘((coeff‘𝐹)‘𝑘)) ∈ {0}))
39	36, 37, 38	3imtr4g 296	. . . . . . 7 ⊢ (𝜑 → (((coeff‘𝐹)‘𝑘) ∈ (𝑆 ∪ {0}) → (∗‘((coeff‘𝐹)‘𝑘)) ∈ (𝑆 ∪ {0})))
40	39	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → (((coeff‘𝐹)‘𝑘) ∈ (𝑆 ∪ {0}) → (∗‘((coeff‘𝐹)‘𝑘)) ∈ (𝑆 ∪ {0})))
41	21, 40	mpd 15	. . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → (∗‘((coeff‘𝐹)‘𝑘)) ∈ (𝑆 ∪ {0}))
42	19, 41	eqeltrd 2828	. . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → ((∗ ∘ (coeff‘𝐹))‘𝑘) ∈ (𝑆 ∪ {0}))
43	11, 14, 42	elplyd 26105	. . 3 ⊢ (𝜑 → (𝑧 ∈ ℂ ↦ Σ𝑘 ∈ (0...𝑁)(((∗ ∘ (coeff‘𝐹))‘𝑘) · (𝑧↑𝑘))) ∈ (Poly‘(𝑆 ∪ {0})))
44	6, 43	eqeltrd 2828	. 2 ⊢ (𝜑 → 𝐺 ∈ (Poly‘(𝑆 ∪ {0})))
45		plyun0 26100	. 2 ⊢ (Poly‘(𝑆 ∪ {0})) = (Poly‘𝑆)
46	44, 45	eleqtrdi 2838	1 ⊢ (𝜑 → 𝐺 ∈ (Poly‘𝑆))

Syntax hints:   → wi 4   ∧ wa 395   ∨ wo 847   = wceq 1540   ∈ wcel 2109  ∀wral 3044   ∪ cun 3901   ⊆ wss 3903  {csn 4577   ↦ cmpt 5173   ∘ ccom 5623  ⟶wf 6478  ‘cfv 6482  (class class class)co 7349  ℂcc 11007  0cc0 11009   · cmul 11014  ℕ₀cn0 12384  ...cfz 13410  ↑cexp 13968  ∗ccj 15003  Σcsu 15593  Polycply 26087  coeffccoe 26089  degcdgr 26090

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-rep 5218  ax-sep 5235  ax-nul 5245  ax-pow 5304  ax-pr 5371  ax-un 7671  ax-inf2 9537  ax-cnex 11065  ax-resscn 11066  ax-1cn 11067  ax-icn 11068  ax-addcl 11069  ax-addrcl 11070  ax-mulcl 11071  ax-mulrcl 11072  ax-mulcom 11073  ax-addass 11074  ax-mulass 11075  ax-distr 11076  ax-i2m1 11077  ax-1ne0 11078  ax-1rid 11079  ax-rnegex 11080  ax-rrecex 11081  ax-cnre 11082  ax-pre-lttri 11083  ax-pre-lttrn 11084  ax-pre-ltadd 11085  ax-pre-mulgt0 11086  ax-pre-sup 11087

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-nel 3030  df-ral 3045  df-rex 3054  df-rmo 3343  df-reu 3344  df-rab 3395  df-v 3438  df-sbc 3743  df-csb 3852  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-pss 3923  df-nul 4285  df-if 4477  df-pw 4553  df-sn 4578  df-pr 4580  df-op 4584  df-uni 4859  df-int 4897  df-iun 4943  df-br 5093  df-opab 5155  df-mpt 5174  df-tr 5200  df-id 5514  df-eprel 5519  df-po 5527  df-so 5528  df-fr 5572  df-se 5573  df-we 5574  df-xp 5625  df-rel 5626  df-cnv 5627  df-co 5628  df-dm 5629  df-rn 5630  df-res 5631  df-ima 5632  df-pred 6249  df-ord 6310  df-on 6311  df-lim 6312  df-suc 6313  df-iota 6438  df-fun 6484  df-fn 6485  df-f 6486  df-f1 6487  df-fo 6488  df-f1o 6489  df-fv 6490  df-isom 6491  df-riota 7306  df-ov 7352  df-oprab 7353  df-mpo 7354  df-of 7613  df-om 7800  df-1st 7924  df-2nd 7925  df-frecs 8214  df-wrecs 8245  df-recs 8294  df-rdg 8332  df-1o 8388  df-er 8625  df-map 8755  df-pm 8756  df-en 8873  df-dom 8874  df-sdom 8875  df-fin 8876  df-sup 9332  df-inf 9333  df-oi 9402  df-card 9835  df-pnf 11151  df-mnf 11152  df-xr 11153  df-ltxr 11154  df-le 11155  df-sub 11349  df-neg 11350  df-div 11778  df-nn 12129  df-2 12191  df-3 12192  df-n0 12385  df-z 12472  df-uz 12736  df-rp 12894  df-fz 13411  df-fzo 13558  df-fl 13696  df-seq 13909  df-exp 13969  df-hash 14238  df-cj 15006  df-re 15007  df-im 15008  df-sqrt 15142  df-abs 15143  df-clim 15395  df-rlim 15396  df-sum 15594  df-0p 25569  df-ply 26091  df-coe 26093  df-dgr 26094

This theorem is referenced by:  coecjOLD  26184