Theorem expadd 12764

Description: Sum of exponents law for nonnegative integer exponentiation. Proposition 10-4.2(a) of [Gleason] p. 135. (Contributed by NM, 30-Nov-2004.)

Assertion

Ref	Expression
expadd	⊢ ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0 ∧ 𝑁 ∈ ℕ0) → (𝐴↑(𝑀 + 𝑁)) = ((𝐴↑𝑀) · (𝐴↑𝑁)))

Proof of Theorem expadd

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

Step	Hyp	Ref	Expression
1		oveq2 6557	. . . . . . 7 ⊢ (𝑗 = 0 → (𝑀 + 𝑗) = (𝑀 + 0))
2	1	oveq2d 6565	. . . . . 6 ⊢ (𝑗 = 0 → (𝐴↑(𝑀 + 𝑗)) = (𝐴↑(𝑀 + 0)))
3		oveq2 6557	. . . . . . 7 ⊢ (𝑗 = 0 → (𝐴↑𝑗) = (𝐴↑0))
4	3	oveq2d 6565	. . . . . 6 ⊢ (𝑗 = 0 → ((𝐴↑𝑀) · (𝐴↑𝑗)) = ((𝐴↑𝑀) · (𝐴↑0)))
5	2, 4	eqeq12d 2625	. . . . 5 ⊢ (𝑗 = 0 → ((𝐴↑(𝑀 + 𝑗)) = ((𝐴↑𝑀) · (𝐴↑𝑗)) ↔ (𝐴↑(𝑀 + 0)) = ((𝐴↑𝑀) · (𝐴↑0))))
6	5	imbi2d 329	. . . 4 ⊢ (𝑗 = 0 → (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → (𝐴↑(𝑀 + 𝑗)) = ((𝐴↑𝑀) · (𝐴↑𝑗))) ↔ ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → (𝐴↑(𝑀 + 0)) = ((𝐴↑𝑀) · (𝐴↑0)))))
7		oveq2 6557	. . . . . . 7 ⊢ (𝑗 = 𝑘 → (𝑀 + 𝑗) = (𝑀 + 𝑘))
8	7	oveq2d 6565	. . . . . 6 ⊢ (𝑗 = 𝑘 → (𝐴↑(𝑀 + 𝑗)) = (𝐴↑(𝑀 + 𝑘)))
9		oveq2 6557	. . . . . . 7 ⊢ (𝑗 = 𝑘 → (𝐴↑𝑗) = (𝐴↑𝑘))
10	9	oveq2d 6565	. . . . . 6 ⊢ (𝑗 = 𝑘 → ((𝐴↑𝑀) · (𝐴↑𝑗)) = ((𝐴↑𝑀) · (𝐴↑𝑘)))
11	8, 10	eqeq12d 2625	. . . . 5 ⊢ (𝑗 = 𝑘 → ((𝐴↑(𝑀 + 𝑗)) = ((𝐴↑𝑀) · (𝐴↑𝑗)) ↔ (𝐴↑(𝑀 + 𝑘)) = ((𝐴↑𝑀) · (𝐴↑𝑘))))
12	11	imbi2d 329	. . . 4 ⊢ (𝑗 = 𝑘 → (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → (𝐴↑(𝑀 + 𝑗)) = ((𝐴↑𝑀) · (𝐴↑𝑗))) ↔ ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → (𝐴↑(𝑀 + 𝑘)) = ((𝐴↑𝑀) · (𝐴↑𝑘)))))
13		oveq2 6557	. . . . . . 7 ⊢ (𝑗 = (𝑘 + 1) → (𝑀 + 𝑗) = (𝑀 + (𝑘 + 1)))
14	13	oveq2d 6565	. . . . . 6 ⊢ (𝑗 = (𝑘 + 1) → (𝐴↑(𝑀 + 𝑗)) = (𝐴↑(𝑀 + (𝑘 + 1))))
15		oveq2 6557	. . . . . . 7 ⊢ (𝑗 = (𝑘 + 1) → (𝐴↑𝑗) = (𝐴↑(𝑘 + 1)))
16	15	oveq2d 6565	. . . . . 6 ⊢ (𝑗 = (𝑘 + 1) → ((𝐴↑𝑀) · (𝐴↑𝑗)) = ((𝐴↑𝑀) · (𝐴↑(𝑘 + 1))))
17	14, 16	eqeq12d 2625	. . . . 5 ⊢ (𝑗 = (𝑘 + 1) → ((𝐴↑(𝑀 + 𝑗)) = ((𝐴↑𝑀) · (𝐴↑𝑗)) ↔ (𝐴↑(𝑀 + (𝑘 + 1))) = ((𝐴↑𝑀) · (𝐴↑(𝑘 + 1)))))
18	17	imbi2d 329	. . . 4 ⊢ (𝑗 = (𝑘 + 1) → (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → (𝐴↑(𝑀 + 𝑗)) = ((𝐴↑𝑀) · (𝐴↑𝑗))) ↔ ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → (𝐴↑(𝑀 + (𝑘 + 1))) = ((𝐴↑𝑀) · (𝐴↑(𝑘 + 1))))))
19		oveq2 6557	. . . . . . 7 ⊢ (𝑗 = 𝑁 → (𝑀 + 𝑗) = (𝑀 + 𝑁))
20	19	oveq2d 6565	. . . . . 6 ⊢ (𝑗 = 𝑁 → (𝐴↑(𝑀 + 𝑗)) = (𝐴↑(𝑀 + 𝑁)))
21		oveq2 6557	. . . . . . 7 ⊢ (𝑗 = 𝑁 → (𝐴↑𝑗) = (𝐴↑𝑁))
22	21	oveq2d 6565	. . . . . 6 ⊢ (𝑗 = 𝑁 → ((𝐴↑𝑀) · (𝐴↑𝑗)) = ((𝐴↑𝑀) · (𝐴↑𝑁)))
23	20, 22	eqeq12d 2625	. . . . 5 ⊢ (𝑗 = 𝑁 → ((𝐴↑(𝑀 + 𝑗)) = ((𝐴↑𝑀) · (𝐴↑𝑗)) ↔ (𝐴↑(𝑀 + 𝑁)) = ((𝐴↑𝑀) · (𝐴↑𝑁))))
24	23	imbi2d 329	. . . 4 ⊢ (𝑗 = 𝑁 → (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → (𝐴↑(𝑀 + 𝑗)) = ((𝐴↑𝑀) · (𝐴↑𝑗))) ↔ ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → (𝐴↑(𝑀 + 𝑁)) = ((𝐴↑𝑀) · (𝐴↑𝑁)))))
25		nn0cn 11179	. . . . . . . . 9 ⊢ (𝑀 ∈ ℕ0 → 𝑀 ∈ ℂ)
26	25	addid1d 10115	. . . . . . . 8 ⊢ (𝑀 ∈ ℕ0 → (𝑀 + 0) = 𝑀)
27	26	adantl 481	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → (𝑀 + 0) = 𝑀)
28	27	oveq2d 6565	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → (𝐴↑(𝑀 + 0)) = (𝐴↑𝑀))
29		expcl 12740	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → (𝐴↑𝑀) ∈ ℂ)
30	29	mulid1d 9936	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → ((𝐴↑𝑀) · 1) = (𝐴↑𝑀))
31	28, 30	eqtr4d 2647	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → (𝐴↑(𝑀 + 0)) = ((𝐴↑𝑀) · 1))
32		exp0 12726	. . . . . . 7 ⊢ (𝐴 ∈ ℂ → (𝐴↑0) = 1)
33	32	adantr 480	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → (𝐴↑0) = 1)
34	33	oveq2d 6565	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → ((𝐴↑𝑀) · (𝐴↑0)) = ((𝐴↑𝑀) · 1))
35	31, 34	eqtr4d 2647	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → (𝐴↑(𝑀 + 0)) = ((𝐴↑𝑀) · (𝐴↑0)))
36		oveq1 6556	. . . . . . 7 ⊢ ((𝐴↑(𝑀 + 𝑘)) = ((𝐴↑𝑀) · (𝐴↑𝑘)) → ((𝐴↑(𝑀 + 𝑘)) · 𝐴) = (((𝐴↑𝑀) · (𝐴↑𝑘)) · 𝐴))
37		nn0cn 11179	. . . . . . . . . . . 12 ⊢ (𝑘 ∈ ℕ0 → 𝑘 ∈ ℂ)
38		ax-1cn 9873	. . . . . . . . . . . . 13 ⊢ 1 ∈ ℂ
39		addass 9902	. . . . . . . . . . . . 13 ⊢ ((𝑀 ∈ ℂ ∧ 𝑘 ∈ ℂ ∧ 1 ∈ ℂ) → ((𝑀 + 𝑘) + 1) = (𝑀 + (𝑘 + 1)))
40	38, 39	mp3an3 1405	. . . . . . . . . . . 12 ⊢ ((𝑀 ∈ ℂ ∧ 𝑘 ∈ ℂ) → ((𝑀 + 𝑘) + 1) = (𝑀 + (𝑘 + 1)))
41	25, 37, 40	syl2an 493	. . . . . . . . . . 11 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑘 ∈ ℕ0) → ((𝑀 + 𝑘) + 1) = (𝑀 + (𝑘 + 1)))
42	41	adantll 746	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → ((𝑀 + 𝑘) + 1) = (𝑀 + (𝑘 + 1)))
43	42	oveq2d 6565	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → (𝐴↑((𝑀 + 𝑘) + 1)) = (𝐴↑(𝑀 + (𝑘 + 1))))
44		simpll 786	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → 𝐴 ∈ ℂ)
45		nn0addcl 11205	. . . . . . . . . . 11 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑘 ∈ ℕ0) → (𝑀 + 𝑘) ∈ ℕ0)
46	45	adantll 746	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → (𝑀 + 𝑘) ∈ ℕ0)
47		expp1 12729	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (𝑀 + 𝑘) ∈ ℕ0) → (𝐴↑((𝑀 + 𝑘) + 1)) = ((𝐴↑(𝑀 + 𝑘)) · 𝐴))
48	44, 46, 47	syl2anc 691	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → (𝐴↑((𝑀 + 𝑘) + 1)) = ((𝐴↑(𝑀 + 𝑘)) · 𝐴))
49	43, 48	eqtr3d 2646	. . . . . . . 8 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → (𝐴↑(𝑀 + (𝑘 + 1))) = ((𝐴↑(𝑀 + 𝑘)) · 𝐴))
50		expp1 12729	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ 𝑘 ∈ ℕ0) → (𝐴↑(𝑘 + 1)) = ((𝐴↑𝑘) · 𝐴))
51	50	adantlr 747	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → (𝐴↑(𝑘 + 1)) = ((𝐴↑𝑘) · 𝐴))
52	51	oveq2d 6565	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → ((𝐴↑𝑀) · (𝐴↑(𝑘 + 1))) = ((𝐴↑𝑀) · ((𝐴↑𝑘) · 𝐴)))
53	29	adantr 480	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → (𝐴↑𝑀) ∈ ℂ)
54		expcl 12740	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ 𝑘 ∈ ℕ0) → (𝐴↑𝑘) ∈ ℂ)
55	54	adantlr 747	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → (𝐴↑𝑘) ∈ ℂ)
56	53, 55, 44	mulassd 9942	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → (((𝐴↑𝑀) · (𝐴↑𝑘)) · 𝐴) = ((𝐴↑𝑀) · ((𝐴↑𝑘) · 𝐴)))
57	52, 56	eqtr4d 2647	. . . . . . . 8 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → ((𝐴↑𝑀) · (𝐴↑(𝑘 + 1))) = (((𝐴↑𝑀) · (𝐴↑𝑘)) · 𝐴))
58	49, 57	eqeq12d 2625	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → ((𝐴↑(𝑀 + (𝑘 + 1))) = ((𝐴↑𝑀) · (𝐴↑(𝑘 + 1))) ↔ ((𝐴↑(𝑀 + 𝑘)) · 𝐴) = (((𝐴↑𝑀) · (𝐴↑𝑘)) · 𝐴)))
59	36, 58	syl5ibr 235	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → ((𝐴↑(𝑀 + 𝑘)) = ((𝐴↑𝑀) · (𝐴↑𝑘)) → (𝐴↑(𝑀 + (𝑘 + 1))) = ((𝐴↑𝑀) · (𝐴↑(𝑘 + 1)))))
60	59	expcom 450	. . . . 5 ⊢ (𝑘 ∈ ℕ0 → ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → ((𝐴↑(𝑀 + 𝑘)) = ((𝐴↑𝑀) · (𝐴↑𝑘)) → (𝐴↑(𝑀 + (𝑘 + 1))) = ((𝐴↑𝑀) · (𝐴↑(𝑘 + 1))))))
61	60	a2d 29	. . . 4 ⊢ (𝑘 ∈ ℕ0 → (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → (𝐴↑(𝑀 + 𝑘)) = ((𝐴↑𝑀) · (𝐴↑𝑘))) → ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → (𝐴↑(𝑀 + (𝑘 + 1))) = ((𝐴↑𝑀) · (𝐴↑(𝑘 + 1))))))
62	6, 12, 18, 24, 35, 61	nn0ind 11348	. . 3 ⊢ (𝑁 ∈ ℕ0 → ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → (𝐴↑(𝑀 + 𝑁)) = ((𝐴↑𝑀) · (𝐴↑𝑁))))
63	62	expdcom 454	. 2 ⊢ (𝐴 ∈ ℂ → (𝑀 ∈ ℕ0 → (𝑁 ∈ ℕ0 → (𝐴↑(𝑀 + 𝑁)) = ((𝐴↑𝑀) · (𝐴↑𝑁)))))
64	63	3imp 1249	1 ⊢ ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0 ∧ 𝑁 ∈ ℕ0) → (𝐴↑(𝑀 + 𝑁)) = ((𝐴↑𝑀) · (𝐴↑𝑁)))

Syntax hints:   → wi 4   ∧ wa 383   ∧ w3a 1031   = wceq 1475   ∈ wcel 1977  (class class class)co 6549  ℂcc 9813  0cc0 9815  1c1 9816   + caddc 9818   · cmul 9820  ℕ₀cn0 11169  ↑cexp 12722

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-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-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-2nd 7060  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-er 7629  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-seq 12664  df-exp 12723

This theorem is referenced by:  expaddzlem  12765  expaddz  12766  expmul  12767  i4  12829  expaddd  12872  faclbnd4lem1  12942  fallrisefac  14595  fsumcube  14630  ef01bndlem  14753  modxai  15610  numexp2x  15621  expmhm  19634  quart1lem  24382  log2ublem2  24474  bposlem8  24816  2exp5  40045  2exp11  40055  3exp4mod41  40071