Theorem elplyd 15468

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 5650	. . . . . . 7 ⊢ Ⅎ𝑘((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑗)
2		nfcv 2374	. . . . . . 7 ⊢ Ⅎ𝑘 ·
3		nfcv 2374	. . . . . . 7 ⊢ Ⅎ𝑘(𝑧↑𝑗)
4	1, 2, 3	nfov 6048	. . . . . 6 ⊢ Ⅎ𝑘(((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑗) · (𝑧↑𝑗))
5		nfcv 2374	. . . . . 6 ⊢ Ⅎ𝑗(((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑘) · (𝑧↑𝑘))
6		fveq2 5639	. . . . . . 7 ⊢ (𝑗 = 𝑘 → ((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑗) = ((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑘))
7		oveq2 6026	. . . . . . 7 ⊢ (𝑗 = 𝑘 → (𝑧↑𝑗) = (𝑧↑𝑘))
8	6, 7	oveq12d 6036	. . . . . 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 11924	. . . . 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 10349	. . . . . . . . 9 ⊢ (𝑘 ∈ (0...𝑁) → 𝑘 ∈ ℕ0)
11		iftrue 3610	. . . . . . . . . . 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 2308	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → if(𝑘 ∈ (0...𝑁), 𝐴, 0) ∈ 𝑆)
15		eqid 2231	. . . . . . . . . 10 ⊢ (𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0)) = (𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))
16	15	fvmpt2 5730	. . . . . . . . 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 2264	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → ((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑘) = 𝐴)
19	18	oveq1d 6033	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → (((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑘) · (𝑧↑𝑘)) = (𝐴 · (𝑧↑𝑘)))
20	19	sumeq2dv 11930	. . . . 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 2276	. . . 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 4180	. . 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 8172	. . . . . 6 ⊢ (𝜑 → 0 ∈ ℂ)
25	24	snssd 3818	. . . . 5 ⊢ (𝜑 → {0} ⊆ ℂ)
26	23, 25	unssd 3383	. . . 4 ⊢ (𝜑 → (𝑆 ∪ {0}) ⊆ ℂ)
27		elplyd.2	. . . 4 ⊢ (𝜑 → 𝑁 ∈ ℕ0)
28		elun1 3374	. . . . . . . 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 3371	. . . . . . . 8 ⊢ {0} ⊆ (𝑆 ∪ {0})
32		c0ex 8173	. . . . . . . . 9 ⊢ 0 ∈ V
33	32	snss 3808	. . . . . . . 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 9499	. . . . . . . 8 ⊢ (𝑘 ∈ ℕ0 → 𝑘 ∈ ℤ)
37	36	adantl 277	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → 𝑘 ∈ ℤ)
38		0zd 9491	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → 0 ∈ ℤ)
39	27	nn0zd 9600	. . . . . . . 8 ⊢ (𝜑 → 𝑁 ∈ ℤ)
40	39	adantr 276	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → 𝑁 ∈ ℤ)
41		fzdcel 10275	. . . . . . 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 3635	. . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → if(𝑘 ∈ (0...𝑁), 𝐴, 0) ∈ (𝑆 ∪ {0}))
44	43	fmpttd 5802	. . . 4 ⊢ (𝜑 → (𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0)):ℕ0⟶(𝑆 ∪ {0}))
45		elplyr 15467	. . . 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 2309	. 2 ⊢ (𝜑 → (𝑧 ∈ ℂ ↦ Σ𝑘 ∈ (0...𝑁)(𝐴 · (𝑧↑𝑘))) ∈ (Poly‘(𝑆 ∪ {0})))
48		plyun0 15463	. 2 ⊢ (Poly‘(𝑆 ∪ {0})) = (Poly‘𝑆)
49	47, 48	eleqtrdi 2324	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 2202   ∪ cun 3198   ⊆ wss 3200  ifcif 3605  {csn 3669   ↦ cmpt 4150  ⟶wf 5322  ‘cfv 5326  (class class class)co 6018  ℂcc 8030  0cc0 8032   · cmul 8037  ℕ₀cn0 9402  ℤcz 9479  ...cfz 10243  ↑cexp 10801  Σcsu 11915  Polycply 15455

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 2204  ax-14 2205  ax-ext 2213  ax-coll 4204  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635  ax-cnex 8123  ax-resscn 8124  ax-1cn 8125  ax-1re 8126  ax-icn 8127  ax-addcl 8128  ax-addrcl 8129  ax-mulcl 8130  ax-addcom 8132  ax-addass 8134  ax-distr 8136  ax-i2m1 8137  ax-0lt1 8138  ax-0id 8140  ax-rnegex 8141  ax-cnre 8143  ax-pre-ltirr 8144  ax-pre-ltwlin 8145  ax-pre-lttrn 8146  ax-pre-ltadd 8148

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 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-nel 2498  df-ral 2515  df-rex 2516  df-reu 2517  df-rab 2519  df-v 2804  df-sbc 3032  df-csb 3128  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-if 3606  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-int 3929  df-iun 3972  df-br 4089  df-opab 4151  df-mpt 4152  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-ima 4738  df-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-f1 5331  df-fo 5332  df-f1o 5333  df-fv 5334  df-riota 5971  df-ov 6021  df-oprab 6022  df-mpo 6023  df-1st 6303  df-2nd 6304  df-recs 6471  df-frec 6557  df-map 6819  df-pnf 8216  df-mnf 8217  df-xr 8218  df-ltxr 8219  df-le 8220  df-sub 8352  df-neg 8353  df-inn 9144  df-n0 9403  df-z 9480  df-uz 9756  df-fz 10244  df-seqfrec 10711  df-sumdc 11916  df-ply 15457

This theorem is referenced by:  ply1term  15470  plyaddlem  15476  plymullem  15477  plycj  15488  dvply2g  15493