Theorem coeid 26171

Description: Reconstruct a polynomial as an explicit sum of the coefficient function up to the degree of the polynomial. (Contributed by Mario Carneiro, 22-Jul-2014.)

Hypotheses

Ref	Expression
dgrub.1	⊢ 𝐴 = (coeff‘𝐹)
dgrub.2	⊢ 𝑁 = (deg‘𝐹)

Assertion

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

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

Proof of Theorem coeid

Dummy variables 𝑎 𝑛 𝑥 𝑚 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		elply2 26129	. . 3 ⊢ (𝐹 ∈ (Poly‘𝑆) ↔ (𝑆 ⊆ ℂ ∧ ∃𝑛 ∈ ℕ0 ∃𝑎 ∈ ((𝑆 ∪ {0}) ↑m ℕ0)((𝑎 “ (ℤ≥‘(𝑛 + 1))) = {0} ∧ 𝐹 = (𝑥 ∈ ℂ ↦ Σ𝑚 ∈ (0...𝑛)((𝑎‘𝑚) · (𝑥↑𝑚))))))
2	1	simprbi 496	. 2 ⊢ (𝐹 ∈ (Poly‘𝑆) → ∃𝑛 ∈ ℕ0 ∃𝑎 ∈ ((𝑆 ∪ {0}) ↑m ℕ0)((𝑎 “ (ℤ≥‘(𝑛 + 1))) = {0} ∧ 𝐹 = (𝑥 ∈ ℂ ↦ Σ𝑚 ∈ (0...𝑛)((𝑎‘𝑚) · (𝑥↑𝑚)))))
3		dgrub.1	. . . . 5 ⊢ 𝐴 = (coeff‘𝐹)
4		dgrub.2	. . . . 5 ⊢ 𝑁 = (deg‘𝐹)
5		simpll 766	. . . . 5 ⊢ (((𝐹 ∈ (Poly‘𝑆) ∧ (𝑛 ∈ ℕ0 ∧ 𝑎 ∈ ((𝑆 ∪ {0}) ↑m ℕ0))) ∧ ((𝑎 “ (ℤ≥‘(𝑛 + 1))) = {0} ∧ 𝐹 = (𝑥 ∈ ℂ ↦ Σ𝑚 ∈ (0...𝑛)((𝑎‘𝑚) · (𝑥↑𝑚))))) → 𝐹 ∈ (Poly‘𝑆))
6		simplrl 776	. . . . 5 ⊢ (((𝐹 ∈ (Poly‘𝑆) ∧ (𝑛 ∈ ℕ0 ∧ 𝑎 ∈ ((𝑆 ∪ {0}) ↑m ℕ0))) ∧ ((𝑎 “ (ℤ≥‘(𝑛 + 1))) = {0} ∧ 𝐹 = (𝑥 ∈ ℂ ↦ Σ𝑚 ∈ (0...𝑛)((𝑎‘𝑚) · (𝑥↑𝑚))))) → 𝑛 ∈ ℕ0)
7		simplrr 777	. . . . 5 ⊢ (((𝐹 ∈ (Poly‘𝑆) ∧ (𝑛 ∈ ℕ0 ∧ 𝑎 ∈ ((𝑆 ∪ {0}) ↑m ℕ0))) ∧ ((𝑎 “ (ℤ≥‘(𝑛 + 1))) = {0} ∧ 𝐹 = (𝑥 ∈ ℂ ↦ Σ𝑚 ∈ (0...𝑛)((𝑎‘𝑚) · (𝑥↑𝑚))))) → 𝑎 ∈ ((𝑆 ∪ {0}) ↑m ℕ0))
8		simprl 770	. . . . 5 ⊢ (((𝐹 ∈ (Poly‘𝑆) ∧ (𝑛 ∈ ℕ0 ∧ 𝑎 ∈ ((𝑆 ∪ {0}) ↑m ℕ0))) ∧ ((𝑎 “ (ℤ≥‘(𝑛 + 1))) = {0} ∧ 𝐹 = (𝑥 ∈ ℂ ↦ Σ𝑚 ∈ (0...𝑛)((𝑎‘𝑚) · (𝑥↑𝑚))))) → (𝑎 “ (ℤ≥‘(𝑛 + 1))) = {0})
9		simprr 772	. . . . . 6 ⊢ (((𝐹 ∈ (Poly‘𝑆) ∧ (𝑛 ∈ ℕ0 ∧ 𝑎 ∈ ((𝑆 ∪ {0}) ↑m ℕ0))) ∧ ((𝑎 “ (ℤ≥‘(𝑛 + 1))) = {0} ∧ 𝐹 = (𝑥 ∈ ℂ ↦ Σ𝑚 ∈ (0...𝑛)((𝑎‘𝑚) · (𝑥↑𝑚))))) → 𝐹 = (𝑥 ∈ ℂ ↦ Σ𝑚 ∈ (0...𝑛)((𝑎‘𝑚) · (𝑥↑𝑚))))
10		fveq2 6828	. . . . . . . . . 10 ⊢ (𝑚 = 𝑘 → (𝑎‘𝑚) = (𝑎‘𝑘))
11		oveq2 7360	. . . . . . . . . 10 ⊢ (𝑚 = 𝑘 → (𝑥↑𝑚) = (𝑥↑𝑘))
12	10, 11	oveq12d 7370	. . . . . . . . 9 ⊢ (𝑚 = 𝑘 → ((𝑎‘𝑚) · (𝑥↑𝑚)) = ((𝑎‘𝑘) · (𝑥↑𝑘)))
13	12	cbvsumv 15605	. . . . . . . 8 ⊢ Σ𝑚 ∈ (0...𝑛)((𝑎‘𝑚) · (𝑥↑𝑚)) = Σ𝑘 ∈ (0...𝑛)((𝑎‘𝑘) · (𝑥↑𝑘))
14		oveq1 7359	. . . . . . . . . 10 ⊢ (𝑥 = 𝑧 → (𝑥↑𝑘) = (𝑧↑𝑘))
15	14	oveq2d 7368	. . . . . . . . 9 ⊢ (𝑥 = 𝑧 → ((𝑎‘𝑘) · (𝑥↑𝑘)) = ((𝑎‘𝑘) · (𝑧↑𝑘)))
16	15	sumeq2sdv 15612	. . . . . . . 8 ⊢ (𝑥 = 𝑧 → Σ𝑘 ∈ (0...𝑛)((𝑎‘𝑘) · (𝑥↑𝑘)) = Σ𝑘 ∈ (0...𝑛)((𝑎‘𝑘) · (𝑧↑𝑘)))
17	13, 16	eqtrid 2780	. . . . . . 7 ⊢ (𝑥 = 𝑧 → Σ𝑚 ∈ (0...𝑛)((𝑎‘𝑚) · (𝑥↑𝑚)) = Σ𝑘 ∈ (0...𝑛)((𝑎‘𝑘) · (𝑧↑𝑘)))
18	17	cbvmptv 5197	. . . . . 6 ⊢ (𝑥 ∈ ℂ ↦ Σ𝑚 ∈ (0...𝑛)((𝑎‘𝑚) · (𝑥↑𝑚))) = (𝑧 ∈ ℂ ↦ Σ𝑘 ∈ (0...𝑛)((𝑎‘𝑘) · (𝑧↑𝑘)))
19	9, 18	eqtrdi 2784	. . . . 5 ⊢ (((𝐹 ∈ (Poly‘𝑆) ∧ (𝑛 ∈ ℕ0 ∧ 𝑎 ∈ ((𝑆 ∪ {0}) ↑m ℕ0))) ∧ ((𝑎 “ (ℤ≥‘(𝑛 + 1))) = {0} ∧ 𝐹 = (𝑥 ∈ ℂ ↦ Σ𝑚 ∈ (0...𝑛)((𝑎‘𝑚) · (𝑥↑𝑚))))) → 𝐹 = (𝑧 ∈ ℂ ↦ Σ𝑘 ∈ (0...𝑛)((𝑎‘𝑘) · (𝑧↑𝑘))))
20	3, 4, 5, 6, 7, 8, 19	coeidlem 26170	. . . 4 ⊢ (((𝐹 ∈ (Poly‘𝑆) ∧ (𝑛 ∈ ℕ0 ∧ 𝑎 ∈ ((𝑆 ∪ {0}) ↑m ℕ0))) ∧ ((𝑎 “ (ℤ≥‘(𝑛 + 1))) = {0} ∧ 𝐹 = (𝑥 ∈ ℂ ↦ Σ𝑚 ∈ (0...𝑛)((𝑎‘𝑚) · (𝑥↑𝑚))))) → 𝐹 = (𝑧 ∈ ℂ ↦ Σ𝑘 ∈ (0...𝑁)((𝐴‘𝑘) · (𝑧↑𝑘))))
21	20	ex 412	. . 3 ⊢ ((𝐹 ∈ (Poly‘𝑆) ∧ (𝑛 ∈ ℕ0 ∧ 𝑎 ∈ ((𝑆 ∪ {0}) ↑m ℕ0))) → (((𝑎 “ (ℤ≥‘(𝑛 + 1))) = {0} ∧ 𝐹 = (𝑥 ∈ ℂ ↦ Σ𝑚 ∈ (0...𝑛)((𝑎‘𝑚) · (𝑥↑𝑚)))) → 𝐹 = (𝑧 ∈ ℂ ↦ Σ𝑘 ∈ (0...𝑁)((𝐴‘𝑘) · (𝑧↑𝑘)))))
22	21	rexlimdvva 3190	. 2 ⊢ (𝐹 ∈ (Poly‘𝑆) → (∃𝑛 ∈ ℕ0 ∃𝑎 ∈ ((𝑆 ∪ {0}) ↑m ℕ0)((𝑎 “ (ℤ≥‘(𝑛 + 1))) = {0} ∧ 𝐹 = (𝑥 ∈ ℂ ↦ Σ𝑚 ∈ (0...𝑛)((𝑎‘𝑚) · (𝑥↑𝑚)))) → 𝐹 = (𝑧 ∈ ℂ ↦ Σ𝑘 ∈ (0...𝑁)((𝐴‘𝑘) · (𝑧↑𝑘)))))
23	2, 22	mpd 15	1 ⊢ (𝐹 ∈ (Poly‘𝑆) → 𝐹 = (𝑧 ∈ ℂ ↦ Σ𝑘 ∈ (0...𝑁)((𝐴‘𝑘) · (𝑧↑𝑘))))

Syntax hints:   → wi 4   ∧ wa 395   = wceq 1541   ∈ wcel 2113  ∃wrex 3057   ∪ cun 3896   ⊆ wss 3898  {csn 4575   ↦ cmpt 5174   “ cima 5622  ‘cfv 6486  (class class class)co 7352   ↑_m cmap 8756  ℂcc 11011  0cc0 11013  1c1 11014   + caddc 11016   · cmul 11018  ℕ₀cn0 12388  ℤ_≥cuz 12738  ...cfz 13409  ↑cexp 13970  Σcsu 15595  Polycply 26117  coeffccoe 26119  degcdgr 26120

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2115  ax-9 2123  ax-10 2146  ax-11 2162  ax-12 2182  ax-ext 2705  ax-rep 5219  ax-sep 5236  ax-nul 5246  ax-pow 5305  ax-pr 5372  ax-un 7674  ax-inf2 9538  ax-cnex 11069  ax-resscn 11070  ax-1cn 11071  ax-icn 11072  ax-addcl 11073  ax-addrcl 11074  ax-mulcl 11075  ax-mulrcl 11076  ax-mulcom 11077  ax-addass 11078  ax-mulass 11079  ax-distr 11080  ax-i2m1 11081  ax-1ne0 11082  ax-1rid 11083  ax-rnegex 11084  ax-rrecex 11085  ax-cnre 11086  ax-pre-lttri 11087  ax-pre-lttrn 11088  ax-pre-ltadd 11089  ax-pre-mulgt0 11090  ax-pre-sup 11091

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-nf 1785  df-sb 2068  df-mo 2537  df-eu 2566  df-clab 2712  df-cleq 2725  df-clel 2808  df-nfc 2882  df-ne 2930  df-nel 3034  df-ral 3049  df-rex 3058  df-rmo 3347  df-reu 3348  df-rab 3397  df-v 3439  df-sbc 3738  df-csb 3847  df-dif 3901  df-un 3903  df-in 3905  df-ss 3915  df-pss 3918  df-nul 4283  df-if 4475  df-pw 4551  df-sn 4576  df-pr 4578  df-op 4582  df-uni 4859  df-int 4898  df-iun 4943  df-br 5094  df-opab 5156  df-mpt 5175  df-tr 5201  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 6253  df-ord 6314  df-on 6315  df-lim 6316  df-suc 6317  df-iota 6442  df-fun 6488  df-fn 6489  df-f 6490  df-f1 6491  df-fo 6492  df-f1o 6493  df-fv 6494  df-isom 6495  df-riota 7309  df-ov 7355  df-oprab 7356  df-mpo 7357  df-of 7616  df-om 7803  df-1st 7927  df-2nd 7928  df-frecs 8217  df-wrecs 8248  df-recs 8297  df-rdg 8335  df-1o 8391  df-er 8628  df-map 8758  df-pm 8759  df-en 8876  df-dom 8877  df-sdom 8878  df-fin 8879  df-sup 9333  df-inf 9334  df-oi 9403  df-card 9839  df-pnf 11155  df-mnf 11156  df-xr 11157  df-ltxr 11158  df-le 11159  df-sub 11353  df-neg 11354  df-div 11782  df-nn 12133  df-2 12195  df-3 12196  df-n0 12389  df-z 12476  df-uz 12739  df-rp 12893  df-fz 13410  df-fzo 13557  df-fl 13698  df-seq 13911  df-exp 13971  df-hash 14240  df-cj 15008  df-re 15009  df-im 15010  df-sqrt 15144  df-abs 15145  df-clim 15397  df-rlim 15398  df-sum 15596  df-0p 25599  df-ply 26121  df-coe 26123  df-dgr 26124

This theorem is referenced by:  coeid2  26172  plyco  26174  0dgrb  26179  coeaddlem  26182  coemullem  26183  coe11  26186  plycn  26194  plycnOLD  26195  plycjlem  26210