Theorem ser1const 14109

Description: Value of the partial series sum of a constant function. (Contributed by NM, 8-Aug-2005.) (Revised by Mario Carneiro, 16-Feb-2014.)

Assertion

Ref	Expression
ser1const	⊢ ((𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ) → (seq1( + , (ℕ × {𝐴}))‘𝑁) = (𝑁 · 𝐴))

Proof of Theorem ser1const

Dummy variables 𝑗 𝑘 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		fveq2 6920	. . . . 5 ⊢ (𝑗 = 1 → (seq1( + , (ℕ × {𝐴}))‘𝑗) = (seq1( + , (ℕ × {𝐴}))‘1))
2		oveq1 7455	. . . . 5 ⊢ (𝑗 = 1 → (𝑗 · 𝐴) = (1 · 𝐴))
3	1, 2	eqeq12d 2756	. . . 4 ⊢ (𝑗 = 1 → ((seq1( + , (ℕ × {𝐴}))‘𝑗) = (𝑗 · 𝐴) ↔ (seq1( + , (ℕ × {𝐴}))‘1) = (1 · 𝐴)))
4	3	imbi2d 340	. . 3 ⊢ (𝑗 = 1 → ((𝐴 ∈ ℂ → (seq1( + , (ℕ × {𝐴}))‘𝑗) = (𝑗 · 𝐴)) ↔ (𝐴 ∈ ℂ → (seq1( + , (ℕ × {𝐴}))‘1) = (1 · 𝐴))))
5		fveq2 6920	. . . . 5 ⊢ (𝑗 = 𝑘 → (seq1( + , (ℕ × {𝐴}))‘𝑗) = (seq1( + , (ℕ × {𝐴}))‘𝑘))
6		oveq1 7455	. . . . 5 ⊢ (𝑗 = 𝑘 → (𝑗 · 𝐴) = (𝑘 · 𝐴))
7	5, 6	eqeq12d 2756	. . . 4 ⊢ (𝑗 = 𝑘 → ((seq1( + , (ℕ × {𝐴}))‘𝑗) = (𝑗 · 𝐴) ↔ (seq1( + , (ℕ × {𝐴}))‘𝑘) = (𝑘 · 𝐴)))
8	7	imbi2d 340	. . 3 ⊢ (𝑗 = 𝑘 → ((𝐴 ∈ ℂ → (seq1( + , (ℕ × {𝐴}))‘𝑗) = (𝑗 · 𝐴)) ↔ (𝐴 ∈ ℂ → (seq1( + , (ℕ × {𝐴}))‘𝑘) = (𝑘 · 𝐴))))
9		fveq2 6920	. . . . 5 ⊢ (𝑗 = (𝑘 + 1) → (seq1( + , (ℕ × {𝐴}))‘𝑗) = (seq1( + , (ℕ × {𝐴}))‘(𝑘 + 1)))
10		oveq1 7455	. . . . 5 ⊢ (𝑗 = (𝑘 + 1) → (𝑗 · 𝐴) = ((𝑘 + 1) · 𝐴))
11	9, 10	eqeq12d 2756	. . . 4 ⊢ (𝑗 = (𝑘 + 1) → ((seq1( + , (ℕ × {𝐴}))‘𝑗) = (𝑗 · 𝐴) ↔ (seq1( + , (ℕ × {𝐴}))‘(𝑘 + 1)) = ((𝑘 + 1) · 𝐴)))
12	11	imbi2d 340	. . 3 ⊢ (𝑗 = (𝑘 + 1) → ((𝐴 ∈ ℂ → (seq1( + , (ℕ × {𝐴}))‘𝑗) = (𝑗 · 𝐴)) ↔ (𝐴 ∈ ℂ → (seq1( + , (ℕ × {𝐴}))‘(𝑘 + 1)) = ((𝑘 + 1) · 𝐴))))
13		fveq2 6920	. . . . 5 ⊢ (𝑗 = 𝑁 → (seq1( + , (ℕ × {𝐴}))‘𝑗) = (seq1( + , (ℕ × {𝐴}))‘𝑁))
14		oveq1 7455	. . . . 5 ⊢ (𝑗 = 𝑁 → (𝑗 · 𝐴) = (𝑁 · 𝐴))
15	13, 14	eqeq12d 2756	. . . 4 ⊢ (𝑗 = 𝑁 → ((seq1( + , (ℕ × {𝐴}))‘𝑗) = (𝑗 · 𝐴) ↔ (seq1( + , (ℕ × {𝐴}))‘𝑁) = (𝑁 · 𝐴)))
16	15	imbi2d 340	. . 3 ⊢ (𝑗 = 𝑁 → ((𝐴 ∈ ℂ → (seq1( + , (ℕ × {𝐴}))‘𝑗) = (𝑗 · 𝐴)) ↔ (𝐴 ∈ ℂ → (seq1( + , (ℕ × {𝐴}))‘𝑁) = (𝑁 · 𝐴))))
17		1z 12673	. . . 4 ⊢ 1 ∈ ℤ
18		1nn 12304	. . . . . 6 ⊢ 1 ∈ ℕ
19		fvconst2g 7239	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 1 ∈ ℕ) → ((ℕ × {𝐴})‘1) = 𝐴)
20	18, 19	mpan2 690	. . . . 5 ⊢ (𝐴 ∈ ℂ → ((ℕ × {𝐴})‘1) = 𝐴)
21		mullid 11289	. . . . 5 ⊢ (𝐴 ∈ ℂ → (1 · 𝐴) = 𝐴)
22	20, 21	eqtr4d 2783	. . . 4 ⊢ (𝐴 ∈ ℂ → ((ℕ × {𝐴})‘1) = (1 · 𝐴))
23	17, 22	seq1i 14066	. . 3 ⊢ (𝐴 ∈ ℂ → (seq1( + , (ℕ × {𝐴}))‘1) = (1 · 𝐴))
24		oveq1 7455	. . . . . 6 ⊢ ((seq1( + , (ℕ × {𝐴}))‘𝑘) = (𝑘 · 𝐴) → ((seq1( + , (ℕ × {𝐴}))‘𝑘) + 𝐴) = ((𝑘 · 𝐴) + 𝐴))
25		seqp1 14067	. . . . . . . . . 10 ⊢ (𝑘 ∈ (ℤ≥‘1) → (seq1( + , (ℕ × {𝐴}))‘(𝑘 + 1)) = ((seq1( + , (ℕ × {𝐴}))‘𝑘) + ((ℕ × {𝐴})‘(𝑘 + 1))))
26		nnuz 12946	. . . . . . . . . 10 ⊢ ℕ = (ℤ≥‘1)
27	25, 26	eleq2s 2862	. . . . . . . . 9 ⊢ (𝑘 ∈ ℕ → (seq1( + , (ℕ × {𝐴}))‘(𝑘 + 1)) = ((seq1( + , (ℕ × {𝐴}))‘𝑘) + ((ℕ × {𝐴})‘(𝑘 + 1))))
28	27	adantl 481	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝑘 ∈ ℕ) → (seq1( + , (ℕ × {𝐴}))‘(𝑘 + 1)) = ((seq1( + , (ℕ × {𝐴}))‘𝑘) + ((ℕ × {𝐴})‘(𝑘 + 1))))
29		peano2nn 12305	. . . . . . . . . 10 ⊢ (𝑘 ∈ ℕ → (𝑘 + 1) ∈ ℕ)
30		fvconst2g 7239	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (𝑘 + 1) ∈ ℕ) → ((ℕ × {𝐴})‘(𝑘 + 1)) = 𝐴)
31	29, 30	sylan2 592	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ 𝑘 ∈ ℕ) → ((ℕ × {𝐴})‘(𝑘 + 1)) = 𝐴)
32	31	oveq2d 7464	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝑘 ∈ ℕ) → ((seq1( + , (ℕ × {𝐴}))‘𝑘) + ((ℕ × {𝐴})‘(𝑘 + 1))) = ((seq1( + , (ℕ × {𝐴}))‘𝑘) + 𝐴))
33	28, 32	eqtrd 2780	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑘 ∈ ℕ) → (seq1( + , (ℕ × {𝐴}))‘(𝑘 + 1)) = ((seq1( + , (ℕ × {𝐴}))‘𝑘) + 𝐴))
34		nncn 12301	. . . . . . . . 9 ⊢ (𝑘 ∈ ℕ → 𝑘 ∈ ℂ)
35		id 22	. . . . . . . . 9 ⊢ (𝐴 ∈ ℂ → 𝐴 ∈ ℂ)
36		ax-1cn 11242	. . . . . . . . . 10 ⊢ 1 ∈ ℂ
37		adddir 11281	. . . . . . . . . 10 ⊢ ((𝑘 ∈ ℂ ∧ 1 ∈ ℂ ∧ 𝐴 ∈ ℂ) → ((𝑘 + 1) · 𝐴) = ((𝑘 · 𝐴) + (1 · 𝐴)))
38	36, 37	mp3an2 1449	. . . . . . . . 9 ⊢ ((𝑘 ∈ ℂ ∧ 𝐴 ∈ ℂ) → ((𝑘 + 1) · 𝐴) = ((𝑘 · 𝐴) + (1 · 𝐴)))
39	34, 35, 38	syl2anr 596	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝑘 ∈ ℕ) → ((𝑘 + 1) · 𝐴) = ((𝑘 · 𝐴) + (1 · 𝐴)))
40	21	adantr 480	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ 𝑘 ∈ ℕ) → (1 · 𝐴) = 𝐴)
41	40	oveq2d 7464	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝑘 ∈ ℕ) → ((𝑘 · 𝐴) + (1 · 𝐴)) = ((𝑘 · 𝐴) + 𝐴))
42	39, 41	eqtrd 2780	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑘 ∈ ℕ) → ((𝑘 + 1) · 𝐴) = ((𝑘 · 𝐴) + 𝐴))
43	33, 42	eqeq12d 2756	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝑘 ∈ ℕ) → ((seq1( + , (ℕ × {𝐴}))‘(𝑘 + 1)) = ((𝑘 + 1) · 𝐴) ↔ ((seq1( + , (ℕ × {𝐴}))‘𝑘) + 𝐴) = ((𝑘 · 𝐴) + 𝐴)))
44	24, 43	imbitrrid 246	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝑘 ∈ ℕ) → ((seq1( + , (ℕ × {𝐴}))‘𝑘) = (𝑘 · 𝐴) → (seq1( + , (ℕ × {𝐴}))‘(𝑘 + 1)) = ((𝑘 + 1) · 𝐴)))
45	44	expcom 413	. . . 4 ⊢ (𝑘 ∈ ℕ → (𝐴 ∈ ℂ → ((seq1( + , (ℕ × {𝐴}))‘𝑘) = (𝑘 · 𝐴) → (seq1( + , (ℕ × {𝐴}))‘(𝑘 + 1)) = ((𝑘 + 1) · 𝐴))))
46	45	a2d 29	. . 3 ⊢ (𝑘 ∈ ℕ → ((𝐴 ∈ ℂ → (seq1( + , (ℕ × {𝐴}))‘𝑘) = (𝑘 · 𝐴)) → (𝐴 ∈ ℂ → (seq1( + , (ℕ × {𝐴}))‘(𝑘 + 1)) = ((𝑘 + 1) · 𝐴))))
47	4, 8, 12, 16, 23, 46	nnind 12311	. 2 ⊢ (𝑁 ∈ ℕ → (𝐴 ∈ ℂ → (seq1( + , (ℕ × {𝐴}))‘𝑁) = (𝑁 · 𝐴)))
48	47	impcom 407	1 ⊢ ((𝐴 ∈ ℂ ∧ 𝑁 ∈ ℕ) → (seq1( + , (ℕ × {𝐴}))‘𝑁) = (𝑁 · 𝐴))

Syntax hints:   → wi 4   ∧ wa 395   = wceq 1537   ∈ wcel 2108  {csn 4648   × cxp 5698  ‘cfv 6573  (class class class)co 7448  ℂcc 11182  1c1 11185   + caddc 11187   · cmul 11189  ℕcn 12293  ℤ_≥cuz 12903  seqcseq 14052

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1793  ax-4 1807  ax-5 1909  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2158  ax-12 2178  ax-ext 2711  ax-sep 5317  ax-nul 5324  ax-pow 5383  ax-pr 5447  ax-un 7770  ax-cnex 11240  ax-resscn 11241  ax-1cn 11242  ax-icn 11243  ax-addcl 11244  ax-addrcl 11245  ax-mulcl 11246  ax-mulrcl 11247  ax-mulcom 11248  ax-addass 11249  ax-mulass 11250  ax-distr 11251  ax-i2m1 11252  ax-1ne0 11253  ax-1rid 11254  ax-rnegex 11255  ax-rrecex 11256  ax-cnre 11257  ax-pre-lttri 11258  ax-pre-lttrn 11259  ax-pre-ltadd 11260  ax-pre-mulgt0 11261

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 847  df-3or 1088  df-3an 1089  df-tru 1540  df-fal 1550  df-ex 1778  df-nf 1782  df-sb 2065  df-mo 2543  df-eu 2572  df-clab 2718  df-cleq 2732  df-clel 2819  df-nfc 2895  df-ne 2947  df-nel 3053  df-ral 3068  df-rex 3077  df-reu 3389  df-rab 3444  df-v 3490  df-sbc 3805  df-csb 3922  df-dif 3979  df-un 3981  df-in 3983  df-ss 3993  df-pss 3996  df-nul 4353  df-if 4549  df-pw 4624  df-sn 4649  df-pr 4651  df-op 4655  df-uni 4932  df-iun 5017  df-br 5167  df-opab 5229  df-mpt 5250  df-tr 5284  df-id 5593  df-eprel 5599  df-po 5607  df-so 5608  df-fr 5652  df-we 5654  df-xp 5706  df-rel 5707  df-cnv 5708  df-co 5709  df-dm 5710  df-rn 5711  df-res 5712  df-ima 5713  df-pred 6332  df-ord 6398  df-on 6399  df-lim 6400  df-suc 6401  df-iota 6525  df-fun 6575  df-fn 6576  df-f 6577  df-f1 6578  df-fo 6579  df-f1o 6580  df-fv 6581  df-riota 7404  df-ov 7451  df-oprab 7452  df-mpo 7453  df-om 7904  df-2nd 8031  df-frecs 8322  df-wrecs 8353  df-recs 8427  df-rdg 8466  df-er 8763  df-en 9004  df-dom 9005  df-sdom 9006  df-pnf 11326  df-mnf 11327  df-xr 11328  df-ltxr 11329  df-le 11330  df-sub 11522  df-neg 11523  df-nn 12294  df-n0 12554  df-z 12640  df-uz 12904  df-seq 14053

This theorem is referenced by:  fsumconst  15838  vitalilem4  25665  ovoliunnfl  37622  voliunnfl  37624