Theorem elplyd 23762

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 6111	. . . . . . 7 ⊢ Ⅎ𝑘((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑗)
2		nfcv 2751	. . . . . . 7 ⊢ Ⅎ𝑘 ·
3		nfcv 2751	. . . . . . 7 ⊢ Ⅎ𝑘(𝑧↑𝑗)
4	1, 2, 3	nfov 6575	. . . . . 6 ⊢ Ⅎ𝑘(((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑗) · (𝑧↑𝑗))
5		nfcv 2751	. . . . . 6 ⊢ Ⅎ𝑗(((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑘) · (𝑧↑𝑘))
6		fveq2 6103	. . . . . . 7 ⊢ (𝑗 = 𝑘 → ((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑗) = ((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑘))
7		oveq2 6557	. . . . . . 7 ⊢ (𝑗 = 𝑘 → (𝑧↑𝑗) = (𝑧↑𝑘))
8	6, 7	oveq12d 6567	. . . . . 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 14275	. . . . 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 12302	. . . . . . . . . 10 ⊢ (𝑘 ∈ (0...𝑁) → 𝑘 ∈ ℕ0)
11	10	adantl 481	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → 𝑘 ∈ ℕ0)
12		iftrue 4042	. . . . . . . . . . 11 ⊢ (𝑘 ∈ (0...𝑁) → if(𝑘 ∈ (0...𝑁), 𝐴, 0) = 𝐴)
13	12	adantl 481	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → if(𝑘 ∈ (0...𝑁), 𝐴, 0) = 𝐴)
14		elplyd.3	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → 𝐴 ∈ 𝑆)
15	13, 14	eqeltrd 2688	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → if(𝑘 ∈ (0...𝑁), 𝐴, 0) ∈ 𝑆)
16		eqid 2610	. . . . . . . . . 10 ⊢ (𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0)) = (𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))
17	16	fvmpt2 6200	. . . . . . . . 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))
18	11, 15, 17	syl2anc 691	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → ((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑘) = if(𝑘 ∈ (0...𝑁), 𝐴, 0))
19	18, 13	eqtrd 2644	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → ((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑘) = 𝐴)
20	19	oveq1d 6564	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → (((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑘) · (𝑧↑𝑘)) = (𝐴 · (𝑧↑𝑘)))
21	20	sumeq2dv 14281	. . . . 5 ⊢ (𝜑 → Σ𝑘 ∈ (0...𝑁)(((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑘) · (𝑧↑𝑘)) = Σ𝑘 ∈ (0...𝑁)(𝐴 · (𝑧↑𝑘)))
22	9, 21	syl5eq 2656	. . . 4 ⊢ (𝜑 → Σ𝑗 ∈ (0...𝑁)(((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑗) · (𝑧↑𝑗)) = Σ𝑘 ∈ (0...𝑁)(𝐴 · (𝑧↑𝑘)))
23	22	mpteq2dv 4673	. . 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))))
24		elplyd.1	. . . . 5 ⊢ (𝜑 → 𝑆 ⊆ ℂ)
25		0cnd 9912	. . . . . 6 ⊢ (𝜑 → 0 ∈ ℂ)
26	25	snssd 4281	. . . . 5 ⊢ (𝜑 → {0} ⊆ ℂ)
27	24, 26	unssd 3751	. . . 4 ⊢ (𝜑 → (𝑆 ∪ {0}) ⊆ ℂ)
28		elplyd.2	. . . 4 ⊢ (𝜑 → 𝑁 ∈ ℕ0)
29		elun1 3742	. . . . . . . 8 ⊢ (𝐴 ∈ 𝑆 → 𝐴 ∈ (𝑆 ∪ {0}))
30	14, 29	syl 17	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → 𝐴 ∈ (𝑆 ∪ {0}))
31	30	adantlr 747	. . . . . 6 ⊢ (((𝜑 ∧ 𝑘 ∈ ℕ0) ∧ 𝑘 ∈ (0...𝑁)) → 𝐴 ∈ (𝑆 ∪ {0}))
32		ssun2 3739	. . . . . . . 8 ⊢ {0} ⊆ (𝑆 ∪ {0})
33		c0ex 9913	. . . . . . . . 9 ⊢ 0 ∈ V
34	33	snss 4259	. . . . . . . 8 ⊢ (0 ∈ (𝑆 ∪ {0}) ↔ {0} ⊆ (𝑆 ∪ {0}))
35	32, 34	mpbir 220	. . . . . . 7 ⊢ 0 ∈ (𝑆 ∪ {0})
36	35	a1i 11	. . . . . 6 ⊢ (((𝜑 ∧ 𝑘 ∈ ℕ0) ∧ ¬ 𝑘 ∈ (0...𝑁)) → 0 ∈ (𝑆 ∪ {0}))
37	31, 36	ifclda 4070	. . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → if(𝑘 ∈ (0...𝑁), 𝐴, 0) ∈ (𝑆 ∪ {0}))
38	37, 16	fmptd 6292	. . . 4 ⊢ (𝜑 → (𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0)):ℕ0⟶(𝑆 ∪ {0}))
39		elplyr 23761	. . . 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})))
40	27, 28, 38, 39	syl3anc 1318	. . 3 ⊢ (𝜑 → (𝑧 ∈ ℂ ↦ Σ𝑗 ∈ (0...𝑁)(((𝑘 ∈ ℕ0 ↦ if(𝑘 ∈ (0...𝑁), 𝐴, 0))‘𝑗) · (𝑧↑𝑗))) ∈ (Poly‘(𝑆 ∪ {0})))
41	23, 40	eqeltrrd 2689	. 2 ⊢ (𝜑 → (𝑧 ∈ ℂ ↦ Σ𝑘 ∈ (0...𝑁)(𝐴 · (𝑧↑𝑘))) ∈ (Poly‘(𝑆 ∪ {0})))
42		plyun0 23757	. 2 ⊢ (Poly‘(𝑆 ∪ {0})) = (Poly‘𝑆)
43	41, 42	syl6eleq 2698	1 ⊢ (𝜑 → (𝑧 ∈ ℂ ↦ Σ𝑘 ∈ (0...𝑁)(𝐴 · (𝑧↑𝑘))) ∈ (Poly‘𝑆))

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 383   = wceq 1475   ∈ wcel 1977   ∪ cun 3538   ⊆ wss 3540  ifcif 4036  {csn 4125   ↦ cmpt 4643  ⟶wf 5800  ‘cfv 5804  (class class class)co 6549  ℂcc 9813  0cc0 9815   · cmul 9820  ℕ₀cn0 11169  ...cfz 12197  ↑cexp 12722  Σcsu 14264  Polycply 23744

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-fal 1481  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-1st 7059  df-2nd 7060  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-er 7629  df-map 7746  df-en 7842  df-dom 7843  df-sdom 7844  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-nn 10898  df-n0 11170  df-z 11255  df-uz 11564  df-fz 12198  df-seq 12664  df-sum 14265  df-ply 23748

This theorem is referenced by:  ply1term  23764  plyaddlem  23775  plymullem  23776  plycj  23837  dvply2g  23844  elqaalem3  23880  aareccl  23885  taylply2  23926  basellem2  24608  aacllem  42356