Theorem elplyd 15735

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 5686	. . . . . . 7 ⊢ Ⅎ𝑘((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑗)
2		nfcv 2386	. . . . . . 7 ⊢ Ⅎ𝑘 ·
3		nfcv 2386	. . . . . . 7 ⊢ Ⅎ𝑘(𝑧↑𝑗)
4	1, 2, 3	nfov 6088	. . . . . 6 ⊢ Ⅎ𝑘(((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑗) · (𝑧↑𝑗))
5		nfcv 2386	. . . . . 6 ⊢ Ⅎ𝑗(((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑘) · (𝑧↑𝑘))
6		fveq2 5675	. . . . . . 7 ⊢ (𝑗 = 𝑘 → ((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑗) = ((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑘))
7		oveq2 6066	. . . . . . 7 ⊢ (𝑗 = 𝑘 → (𝑧↑𝑗) = (𝑧↑𝑘))
8	6, 7	oveq12d 6076	. . . . . 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 12075	. . . . 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 10473	. . . . . . . . 9 ⊢ (𝑘 ∈ (0...𝑁) → 𝑘 ∈ ℕ0)
11		iftrue 3631	. . . . . . . . . . 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 2311	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → if(𝑘 ∈ (0...𝑁), 𝐴, 0) ∈ 𝑆)
15		eqid 2234	. . . . . . . . . 10 ⊢ (𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0)) = (𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))
16	15	fvmpt2 5766	. . . . . . . . 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 2267	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → ((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑘) = 𝐴)
19	18	oveq1d 6073	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → (((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑘) · (𝑧↑𝑘)) = (𝐴 · (𝑧↑𝑘)))
20	19	sumeq2dv 12081	. . . . 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 2279	. . . 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 4206	. . 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 8283	. . . . . 6 ⊢ (𝜑 → 0 ∈ ℂ)
25	24	snssd 3844	. . . . 5 ⊢ (𝜑 → {0} ⊆ ℂ)
26	23, 25	unssd 3399	. . . 4 ⊢ (𝜑 → (𝑆 ∪ {0}) ⊆ ℂ)
27		elplyd.2	. . . 4 ⊢ (𝜑 → 𝑁 ∈ ℕ0)
28		elun1 3390	. . . . . . . 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 3387	. . . . . . . 8 ⊢ {0} ⊆ (𝑆 ∪ {0})
32		c0ex 8284	. . . . . . . . 9 ⊢ 0 ∈ V
33	32	snss 3834	. . . . . . . 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 9617	. . . . . . . 8 ⊢ (𝑘 ∈ ℕ0 → 𝑘 ∈ ℤ)
37	36	adantl 277	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → 𝑘 ∈ ℤ)
38		0zd 9609	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → 0 ∈ ℤ)
39	27	nn0zd 9719	. . . . . . . 8 ⊢ (𝜑 → 𝑁 ∈ ℤ)
40	39	adantr 276	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → 𝑁 ∈ ℤ)
41		fzdcel 10397	. . . . . . 7 ⊢ ((𝑘 ∈ ℤ ∧ 0 ∈ ℤ ∧ 𝑁 ∈ ℤ) → DECID 𝑘 ∈ (0...𝑁))
42	37, 38, 40, 41	syl3anc 1274	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → DECID 𝑘 ∈ (0...𝑁))
43	30, 35, 42	ifcldadc 3656	. . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → if(𝑘 ∈ (0...𝑁), 𝐴, 0) ∈ (𝑆 ∪ {0}))
44	43	fmpttd 5837	. . . 4 ⊢ (𝜑 → (𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0)):ℕ0⟶(𝑆 ∪ {0}))
45		elplyr 15734	. . . 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 1274	. . 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 2312	. 2 ⊢ (𝜑 → (𝑧 ∈ ℂ ↦ Σ𝑘 ∈ (0...𝑁)(𝐴 · (𝑧↑𝑘))) ∈ (Poly‘(𝑆 ∪ {0})))
48		plyun0 15730	. 2 ⊢ (Poly‘(𝑆 ∪ {0})) = (Poly‘𝑆)
49	47, 48	eleqtrdi 2327	1 ⊢ (𝜑 → (𝑧 ∈ ℂ ↦ Σ𝑘 ∈ (0...𝑁)(𝐴 · (𝑧↑𝑘))) ∈ (Poly‘𝑆))

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 104  DECID wdc 842   = wceq 1398   ∈ wcel 2205   ∪ cun 3212   ⊆ wss 3214  ifcif 3624  {csn 3694   ↦ cmpt 4176  ⟶wf 5353  ‘cfv 5357  (class class class)co 6058  ℂcc 8141  0cc0 8143   · cmul 8148  ℕ₀cn0 9516  ℤcz 9597  ...cfz 10364  ↑cexp 10927  Σcsu 12066  Polycply 15722

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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-coll 4230  ax-sep 4233  ax-pow 4292  ax-pr 4327  ax-un 4559  ax-setind 4664  ax-cnex 8234  ax-resscn 8235  ax-1cn 8236  ax-1re 8237  ax-icn 8238  ax-addcl 8239  ax-addrcl 8240  ax-mulcl 8241  ax-addcom 8243  ax-addass 8245  ax-distr 8247  ax-i2m1 8248  ax-0lt1 8249  ax-0id 8251  ax-rnegex 8252  ax-cnre 8254  ax-pre-ltirr 8255  ax-pre-ltwlin 8256  ax-pre-lttrn 8257  ax-pre-ltadd 8259

This theorem depends on definitions:  df-bi 117  df-dc 843  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-nel 2510  df-ral 2527  df-rex 2528  df-reu 2529  df-rab 2531  df-v 2817  df-sbc 3046  df-csb 3142  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-if 3625  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-int 3955  df-iun 3998  df-br 4115  df-opab 4177  df-mpt 4178  df-id 4419  df-xp 4760  df-rel 4761  df-cnv 4762  df-co 4763  df-dm 4764  df-rn 4765  df-res 4766  df-ima 4767  df-iota 5317  df-fun 5359  df-fn 5360  df-f 5361  df-f1 5362  df-fo 5363  df-f1o 5364  df-fv 5365  df-riota 6011  df-ov 6061  df-oprab 6062  df-mpo 6063  df-1st 6347  df-2nd 6348  df-recs 6549  df-frec 6635  df-map 6897  df-pnf 8326  df-mnf 8327  df-xr 8328  df-ltxr 8329  df-le 8330  df-sub 8463  df-neg 8464  df-inn 9258  df-n0 9517  df-z 9598  df-uz 9875  df-fz 10365  df-seqfrec 10837  df-sumdc 12067  df-ply 15724

This theorem is referenced by:  ply1term  15737  plyaddlem  15743  plymullem  15744  plycj  15755  dvply2g  15760