Theorem elplyd 15494

Description: Sufficient condition for elementhood in the set of polynomials. (Contributed by Mario Carneiro, 17-Jul-2014.)

Hypotheses

Ref	Expression
elplyd.1	⊢ (𝜑 → 𝑆 ⊆ ℂ)
elplyd.2	⊢ (𝜑 → 𝑁 ∈ ℕ0)
elplyd.3	⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → 𝐴 ∈ 𝑆)

Assertion

Ref	Expression
elplyd	⊢ (𝜑 → (𝑧 ∈ ℂ ↦ Σ𝑘 ∈ (0...𝑁)(𝐴 · (𝑧↑𝑘))) ∈ (Poly‘𝑆))

Distinct variable groups:   𝑧,𝐴   𝑧,𝑘,𝑁   𝜑,𝑘,𝑧   𝑆,𝑘,𝑧

Allowed substitution hint:   𝐴(𝑘)

Proof of Theorem elplyd

Dummy variable 𝑗 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		nffvmpt1 5653	. . . . . . 7 ⊢ Ⅎ𝑘((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑗)
2		nfcv 2373	. . . . . . 7 ⊢ Ⅎ𝑘 ·
3		nfcv 2373	. . . . . . 7 ⊢ Ⅎ𝑘(𝑧↑𝑗)
4	1, 2, 3	nfov 6053	. . . . . 6 ⊢ Ⅎ𝑘(((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑗) · (𝑧↑𝑗))
5		nfcv 2373	. . . . . 6 ⊢ Ⅎ𝑗(((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑘) · (𝑧↑𝑘))
6		fveq2 5642	. . . . . . 7 ⊢ (𝑗 = 𝑘 → ((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑗) = ((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑘))
7		oveq2 6031	. . . . . . 7 ⊢ (𝑗 = 𝑘 → (𝑧↑𝑗) = (𝑧↑𝑘))
8	6, 7	oveq12d 6041	. . . . . 6 ⊢ (𝑗 = 𝑘 → (((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑗) · (𝑧↑𝑗)) = (((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑘) · (𝑧↑𝑘)))
9	4, 5, 8	cbvsumi 11945	. . . . 5 ⊢ Σ𝑗 ∈ (0...𝑁)(((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑗) · (𝑧↑𝑗)) = Σ𝑘 ∈ (0...𝑁)(((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑘) · (𝑧↑𝑘))
10		elfznn0 10354	. . . . . . . . 9 ⊢ (𝑘 ∈ (0...𝑁) → 𝑘 ∈ ℕ0)
11		iftrue 3611	. . . . . . . . . . 11 ⊢ (𝑘 ∈ (0...𝑁) → if(𝑘 ∈ (0...𝑁), 𝐴, 0) = 𝐴)
12	11	adantl 277	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → if(𝑘 ∈ (0...𝑁), 𝐴, 0) = 𝐴)
13		elplyd.3	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → 𝐴 ∈ 𝑆)
14	12, 13	eqeltrd 2307	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → if(𝑘 ∈ (0...𝑁), 𝐴, 0) ∈ 𝑆)
15		eqid 2230	. . . . . . . . . 10 ⊢ (𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0)) = (𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))
16	15	fvmpt2 5733	. . . . . . . . 9 ⊢ ((𝑘 ∈ ℕ0 ∧ if(𝑘 ∈ (0...𝑁), 𝐴, 0) ∈ 𝑆) → ((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑘) = if(𝑘 ∈ (0...𝑁), 𝐴, 0))
17	10, 14, 16	syl2an2 598	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → ((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑘) = if(𝑘 ∈ (0...𝑁), 𝐴, 0))
18	17, 12	eqtrd 2263	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → ((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑘) = 𝐴)
19	18	oveq1d 6038	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → (((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑘) · (𝑧↑𝑘)) = (𝐴 · (𝑧↑𝑘)))
20	19	sumeq2dv 11951	. . . . 5 ⊢ (𝜑 → Σ𝑘 ∈ (0...𝑁)(((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑘) · (𝑧↑𝑘)) = Σ𝑘 ∈ (0...𝑁)(𝐴 · (𝑧↑𝑘)))
21	9, 20	eqtrid 2275	. . . 4 ⊢ (𝜑 → Σ𝑗 ∈ (0...𝑁)(((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑗) · (𝑧↑𝑗)) = Σ𝑘 ∈ (0...𝑁)(𝐴 · (𝑧↑𝑘)))
22	21	mpteq2dv 4181	. . 3 ⊢ (𝜑 → (𝑧 ∈ ℂ ↦ Σ𝑗 ∈ (0...𝑁)(((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑗) · (𝑧↑𝑗))) = (𝑧 ∈ ℂ ↦ Σ𝑘 ∈ (0...𝑁)(𝐴 · (𝑧↑𝑘))))
23		elplyd.1	. . . . 5 ⊢ (𝜑 → 𝑆 ⊆ ℂ)
24		0cnd 8177	. . . . . 6 ⊢ (𝜑 → 0 ∈ ℂ)
25	24	snssd 3819	. . . . 5 ⊢ (𝜑 → {0} ⊆ ℂ)
26	23, 25	unssd 3382	. . . 4 ⊢ (𝜑 → (𝑆 ∪ {0}) ⊆ ℂ)
27		elplyd.2	. . . 4 ⊢ (𝜑 → 𝑁 ∈ ℕ0)
28		elun1 3373	. . . . . . . 8 ⊢ (𝐴 ∈ 𝑆 → 𝐴 ∈ (𝑆 ∪ {0}))
29	13, 28	syl 14	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → 𝐴 ∈ (𝑆 ∪ {0}))
30	29	adantlr 477	. . . . . 6 ⊢ (((𝜑 ∧ 𝑘 ∈ ℕ0) ∧ 𝑘 ∈ (0...𝑁)) → 𝐴 ∈ (𝑆 ∪ {0}))
31		ssun2 3370	. . . . . . . 8 ⊢ {0} ⊆ (𝑆 ∪ {0})
32		c0ex 8178	. . . . . . . . 9 ⊢ 0 ∈ V
33	32	snss 3809	. . . . . . . 8 ⊢ (0 ∈ (𝑆 ∪ {0}) ↔ {0} ⊆ (𝑆 ∪ {0}))
34	31, 33	mpbir 146	. . . . . . 7 ⊢ 0 ∈ (𝑆 ∪ {0})
35	34	a1i 9	. . . . . 6 ⊢ (((𝜑 ∧ 𝑘 ∈ ℕ0) ∧ ¬ 𝑘 ∈ (0...𝑁)) → 0 ∈ (𝑆 ∪ {0}))
36		nn0z 9504	. . . . . . . 8 ⊢ (𝑘 ∈ ℕ0 → 𝑘 ∈ ℤ)
37	36	adantl 277	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → 𝑘 ∈ ℤ)
38		0zd 9496	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → 0 ∈ ℤ)
39	27	nn0zd 9605	. . . . . . . 8 ⊢ (𝜑 → 𝑁 ∈ ℤ)
40	39	adantr 276	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → 𝑁 ∈ ℤ)
41		fzdcel 10280	. . . . . . 7 ⊢ ((𝑘 ∈ ℤ ∧ 0 ∈ ℤ ∧ 𝑁 ∈ ℤ) → DECID 𝑘 ∈ (0...𝑁))
42	37, 38, 40, 41	syl3anc 1273	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → DECID 𝑘 ∈ (0...𝑁))
43	30, 35, 42	ifcldadc 3636	. . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → if(𝑘 ∈ (0...𝑁), 𝐴, 0) ∈ (𝑆 ∪ {0}))
44	43	fmpttd 5805	. . . 4 ⊢ (𝜑 → (𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0)):ℕ0⟶(𝑆 ∪ {0}))
45		elplyr 15493	. . . 4 ⊢ (((𝑆 ∪ {0}) ⊆ ℂ ∧ 𝑁 ∈ ℕ0 ∧ (𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0)):ℕ0⟶(𝑆 ∪ {0})) → (𝑧 ∈ ℂ ↦ Σ𝑗 ∈ (0...𝑁)(((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑗) · (𝑧↑𝑗))) ∈ (Poly‘(𝑆 ∪ {0})))
46	26, 27, 44, 45	syl3anc 1273	. . 3 ⊢ (𝜑 → (𝑧 ∈ ℂ ↦ Σ𝑗 ∈ (0...𝑁)(((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑗) · (𝑧↑𝑗))) ∈ (Poly‘(𝑆 ∪ {0})))
47	22, 46	eqeltrrd 2308	. 2 ⊢ (𝜑 → (𝑧 ∈ ℂ ↦ Σ𝑘 ∈ (0...𝑁)(𝐴 · (𝑧↑𝑘))) ∈ (Poly‘(𝑆 ∪ {0})))
48		plyun0 15489	. 2 ⊢ (Poly‘(𝑆 ∪ {0})) = (Poly‘𝑆)
49	47, 48	eleqtrdi 2323	1 ⊢ (𝜑 → (𝑧 ∈ ℂ ↦ Σ𝑘 ∈ (0...𝑁)(𝐴 · (𝑧↑𝑘))) ∈ (Poly‘𝑆))

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 104  DECID wdc 841   = wceq 1397   ∈ wcel 2201   ∪ cun 3197   ⊆ wss 3199  ifcif 3604  {csn 3670   ↦ cmpt 4151  ⟶wf 5324  ‘cfv 5328  (class class class)co 6023  ℂcc 8035  0cc0 8037   · cmul 8042  ℕ₀cn0 9407  ℤcz 9484  ...cfz 10248  ↑cexp 10806  Σcsu 11936  Polycply 15481

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 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2203  ax-14 2204  ax-ext 2212  ax-coll 4205  ax-sep 4208  ax-pow 4266  ax-pr 4301  ax-un 4532  ax-setind 4637  ax-cnex 8128  ax-resscn 8129  ax-1cn 8130  ax-1re 8131  ax-icn 8132  ax-addcl 8133  ax-addrcl 8134  ax-mulcl 8135  ax-addcom 8137  ax-addass 8139  ax-distr 8141  ax-i2m1 8142  ax-0lt1 8143  ax-0id 8145  ax-rnegex 8146  ax-cnre 8148  ax-pre-ltirr 8149  ax-pre-ltwlin 8150  ax-pre-lttrn 8151  ax-pre-ltadd 8153

This theorem depends on definitions:  df-bi 117  df-dc 842  df-3or 1005  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1810  df-eu 2081  df-mo 2082  df-clab 2217  df-cleq 2223  df-clel 2226  df-nfc 2362  df-ne 2402  df-nel 2497  df-ral 2514  df-rex 2515  df-reu 2516  df-rab 2518  df-v 2803  df-sbc 3031  df-csb 3127  df-dif 3201  df-un 3203  df-in 3205  df-ss 3212  df-if 3605  df-pw 3655  df-sn 3676  df-pr 3677  df-op 3679  df-uni 3895  df-int 3930  df-iun 3973  df-br 4090  df-opab 4152  df-mpt 4153  df-id 4392  df-xp 4733  df-rel 4734  df-cnv 4735  df-co 4736  df-dm 4737  df-rn 4738  df-res 4739  df-ima 4740  df-iota 5288  df-fun 5330  df-fn 5331  df-f 5332  df-f1 5333  df-fo 5334  df-f1o 5335  df-fv 5336  df-riota 5976  df-ov 6026  df-oprab 6027  df-mpo 6028  df-1st 6308  df-2nd 6309  df-recs 6476  df-frec 6562  df-map 6824  df-pnf 8221  df-mnf 8222  df-xr 8223  df-ltxr 8224  df-le 8225  df-sub 8357  df-neg 8358  df-inn 9149  df-n0 9408  df-z 9485  df-uz 9761  df-fz 10249  df-seqfrec 10716  df-sumdc 11937  df-ply 15483

This theorem is referenced by:  ply1term  15496  plyaddlem  15502  plymullem  15503  plycj  15514  dvply2g  15519