Theorem expadd 10950

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 6060	. . . . . . 7 ⊢ (𝑗 = 0 → (𝑀 + 𝑗) = (𝑀 + 0))
2	1	oveq2d 6068	. . . . . 6 ⊢ (𝑗 = 0 → (𝐴↑(𝑀 + 𝑗)) = (𝐴↑(𝑀 + 0)))
3		oveq2 6060	. . . . . . 7 ⊢ (𝑗 = 0 → (𝐴↑𝑗) = (𝐴↑0))
4	3	oveq2d 6068	. . . . . 6 ⊢ (𝑗 = 0 → ((𝐴↑𝑀) · (𝐴↑𝑗)) = ((𝐴↑𝑀) · (𝐴↑0)))
5	2, 4	eqeq12d 2249	. . . . 5 ⊢ (𝑗 = 0 → ((𝐴↑(𝑀 + 𝑗)) = ((𝐴↑𝑀) · (𝐴↑𝑗)) ↔ (𝐴↑(𝑀 + 0)) = ((𝐴↑𝑀) · (𝐴↑0))))
6	5	imbi2d 230	. . . 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 6060	. . . . . . 7 ⊢ (𝑗 = 𝑘 → (𝑀 + 𝑗) = (𝑀 + 𝑘))
8	7	oveq2d 6068	. . . . . 6 ⊢ (𝑗 = 𝑘 → (𝐴↑(𝑀 + 𝑗)) = (𝐴↑(𝑀 + 𝑘)))
9		oveq2 6060	. . . . . . 7 ⊢ (𝑗 = 𝑘 → (𝐴↑𝑗) = (𝐴↑𝑘))
10	9	oveq2d 6068	. . . . . 6 ⊢ (𝑗 = 𝑘 → ((𝐴↑𝑀) · (𝐴↑𝑗)) = ((𝐴↑𝑀) · (𝐴↑𝑘)))
11	8, 10	eqeq12d 2249	. . . . 5 ⊢ (𝑗 = 𝑘 → ((𝐴↑(𝑀 + 𝑗)) = ((𝐴↑𝑀) · (𝐴↑𝑗)) ↔ (𝐴↑(𝑀 + 𝑘)) = ((𝐴↑𝑀) · (𝐴↑𝑘))))
12	11	imbi2d 230	. . . 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 6060	. . . . . . 7 ⊢ (𝑗 = (𝑘 + 1) → (𝑀 + 𝑗) = (𝑀 + (𝑘 + 1)))
14	13	oveq2d 6068	. . . . . 6 ⊢ (𝑗 = (𝑘 + 1) → (𝐴↑(𝑀 + 𝑗)) = (𝐴↑(𝑀 + (𝑘 + 1))))
15		oveq2 6060	. . . . . . 7 ⊢ (𝑗 = (𝑘 + 1) → (𝐴↑𝑗) = (𝐴↑(𝑘 + 1)))
16	15	oveq2d 6068	. . . . . 6 ⊢ (𝑗 = (𝑘 + 1) → ((𝐴↑𝑀) · (𝐴↑𝑗)) = ((𝐴↑𝑀) · (𝐴↑(𝑘 + 1))))
17	14, 16	eqeq12d 2249	. . . . 5 ⊢ (𝑗 = (𝑘 + 1) → ((𝐴↑(𝑀 + 𝑗)) = ((𝐴↑𝑀) · (𝐴↑𝑗)) ↔ (𝐴↑(𝑀 + (𝑘 + 1))) = ((𝐴↑𝑀) · (𝐴↑(𝑘 + 1)))))
18	17	imbi2d 230	. . . 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 6060	. . . . . . 7 ⊢ (𝑗 = 𝑁 → (𝑀 + 𝑗) = (𝑀 + 𝑁))
20	19	oveq2d 6068	. . . . . 6 ⊢ (𝑗 = 𝑁 → (𝐴↑(𝑀 + 𝑗)) = (𝐴↑(𝑀 + 𝑁)))
21		oveq2 6060	. . . . . . 7 ⊢ (𝑗 = 𝑁 → (𝐴↑𝑗) = (𝐴↑𝑁))
22	21	oveq2d 6068	. . . . . 6 ⊢ (𝑗 = 𝑁 → ((𝐴↑𝑀) · (𝐴↑𝑗)) = ((𝐴↑𝑀) · (𝐴↑𝑁)))
23	20, 22	eqeq12d 2249	. . . . 5 ⊢ (𝑗 = 𝑁 → ((𝐴↑(𝑀 + 𝑗)) = ((𝐴↑𝑀) · (𝐴↑𝑗)) ↔ (𝐴↑(𝑀 + 𝑁)) = ((𝐴↑𝑀) · (𝐴↑𝑁))))
24	23	imbi2d 230	. . . 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 9511	. . . . . . . . 9 ⊢ (𝑀 ∈ ℕ0 → 𝑀 ∈ ℂ)
26	25	addridd 8427	. . . . . . . 8 ⊢ (𝑀 ∈ ℕ0 → (𝑀 + 0) = 𝑀)
27	26	adantl 277	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → (𝑀 + 0) = 𝑀)
28	27	oveq2d 6068	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → (𝐴↑(𝑀 + 0)) = (𝐴↑𝑀))
29		expcl 10926	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → (𝐴↑𝑀) ∈ ℂ)
30	29	mulridd 8296	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → ((𝐴↑𝑀) · 1) = (𝐴↑𝑀))
31	28, 30	eqtr4d 2270	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → (𝐴↑(𝑀 + 0)) = ((𝐴↑𝑀) · 1))
32		exp0 10912	. . . . . . 7 ⊢ (𝐴 ∈ ℂ → (𝐴↑0) = 1)
33	32	adantr 276	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → (𝐴↑0) = 1)
34	33	oveq2d 6068	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → ((𝐴↑𝑀) · (𝐴↑0)) = ((𝐴↑𝑀) · 1))
35	31, 34	eqtr4d 2270	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → (𝐴↑(𝑀 + 0)) = ((𝐴↑𝑀) · (𝐴↑0)))
36		oveq1 6059	. . . . . . 7 ⊢ ((𝐴↑(𝑀 + 𝑘)) = ((𝐴↑𝑀) · (𝐴↑𝑘)) → ((𝐴↑(𝑀 + 𝑘)) · 𝐴) = (((𝐴↑𝑀) · (𝐴↑𝑘)) · 𝐴))
37		nn0cn 9511	. . . . . . . . . . . 12 ⊢ (𝑘 ∈ ℕ0 → 𝑘 ∈ ℂ)
38		ax-1cn 8225	. . . . . . . . . . . . 13 ⊢ 1 ∈ ℂ
39		addass 8262	. . . . . . . . . . . . 13 ⊢ ((𝑀 ∈ ℂ ∧ 𝑘 ∈ ℂ ∧ 1 ∈ ℂ) → ((𝑀 + 𝑘) + 1) = (𝑀 + (𝑘 + 1)))
40	38, 39	mp3an3 1363	. . . . . . . . . . . 12 ⊢ ((𝑀 ∈ ℂ ∧ 𝑘 ∈ ℂ) → ((𝑀 + 𝑘) + 1) = (𝑀 + (𝑘 + 1)))
41	25, 37, 40	syl2an 289	. . . . . . . . . . 11 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑘 ∈ ℕ0) → ((𝑀 + 𝑘) + 1) = (𝑀 + (𝑘 + 1)))
42	41	adantll 476	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → ((𝑀 + 𝑘) + 1) = (𝑀 + (𝑘 + 1)))
43	42	oveq2d 6068	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → (𝐴↑((𝑀 + 𝑘) + 1)) = (𝐴↑(𝑀 + (𝑘 + 1))))
44		simpll 527	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → 𝐴 ∈ ℂ)
45		nn0addcl 9536	. . . . . . . . . . 11 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑘 ∈ ℕ0) → (𝑀 + 𝑘) ∈ ℕ0)
46	45	adantll 476	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → (𝑀 + 𝑘) ∈ ℕ0)
47		expp1 10915	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (𝑀 + 𝑘) ∈ ℕ0) → (𝐴↑((𝑀 + 𝑘) + 1)) = ((𝐴↑(𝑀 + 𝑘)) · 𝐴))
48	44, 46, 47	syl2anc 411	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → (𝐴↑((𝑀 + 𝑘) + 1)) = ((𝐴↑(𝑀 + 𝑘)) · 𝐴))
49	43, 48	eqtr3d 2269	. . . . . . . 8 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → (𝐴↑(𝑀 + (𝑘 + 1))) = ((𝐴↑(𝑀 + 𝑘)) · 𝐴))
50		expp1 10915	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ 𝑘 ∈ ℕ0) → (𝐴↑(𝑘 + 1)) = ((𝐴↑𝑘) · 𝐴))
51	50	adantlr 477	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → (𝐴↑(𝑘 + 1)) = ((𝐴↑𝑘) · 𝐴))
52	51	oveq2d 6068	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → ((𝐴↑𝑀) · (𝐴↑(𝑘 + 1))) = ((𝐴↑𝑀) · ((𝐴↑𝑘) · 𝐴)))
53	29	adantr 276	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → (𝐴↑𝑀) ∈ ℂ)
54		expcl 10926	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ 𝑘 ∈ ℕ0) → (𝐴↑𝑘) ∈ ℂ)
55	54	adantlr 477	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → (𝐴↑𝑘) ∈ ℂ)
56	53, 55, 44	mulassd 8302	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → (((𝐴↑𝑀) · (𝐴↑𝑘)) · 𝐴) = ((𝐴↑𝑀) · ((𝐴↑𝑘) · 𝐴)))
57	52, 56	eqtr4d 2270	. . . . . . . 8 ⊢ (((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) ∧ 𝑘 ∈ ℕ0) → ((𝐴↑𝑀) · (𝐴↑(𝑘 + 1))) = (((𝐴↑𝑀) · (𝐴↑𝑘)) · 𝐴))
58	49, 57	eqeq12d 2249	. . . . . . 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	imbitrrid 156	. . . . . 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 116	. . . . 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 26	. . . 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 9698	. . 3 ⊢ (𝑁 ∈ ℕ0 → ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0) → (𝐴↑(𝑀 + 𝑁)) = ((𝐴↑𝑀) · (𝐴↑𝑁))))
63	62	expdcom 1488	. 2 ⊢ (𝐴 ∈ ℂ → (𝑀 ∈ ℕ0 → (𝑁 ∈ ℕ0 → (𝐴↑(𝑀 + 𝑁)) = ((𝐴↑𝑀) · (𝐴↑𝑁)))))
64	63	3imp 1220	1 ⊢ ((𝐴 ∈ ℂ ∧ 𝑀 ∈ ℕ0 ∧ 𝑁 ∈ ℕ0) → (𝐴↑(𝑀 + 𝑁)) = ((𝐴↑𝑀) · (𝐴↑𝑁)))

Syntax hints:   → wi 4   ∧ wa 104   ∧ w3a 1005   = wceq 1398   ∈ wcel 2205  (class class class)co 6052  ℂcc 8130  0cc0 8132  1c1 8133   + caddc 8135   · cmul 8137  ℕ₀cn0 9501  ↑cexp 10907

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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-coll 4227  ax-sep 4230  ax-nul 4238  ax-pow 4289  ax-pr 4324  ax-un 4556  ax-setind 4661  ax-iinf 4712  ax-cnex 8223  ax-resscn 8224  ax-1cn 8225  ax-1re 8226  ax-icn 8227  ax-addcl 8228  ax-addrcl 8229  ax-mulcl 8230  ax-mulrcl 8231  ax-addcom 8232  ax-mulcom 8233  ax-addass 8234  ax-mulass 8235  ax-distr 8236  ax-i2m1 8237  ax-0lt1 8238  ax-1rid 8239  ax-0id 8240  ax-rnegex 8241  ax-precex 8242  ax-cnre 8243  ax-pre-ltirr 8244  ax-pre-ltwlin 8245  ax-pre-lttrn 8246  ax-pre-apti 8247  ax-pre-ltadd 8248  ax-pre-mulgt0 8249  ax-pre-mulext 8250

This theorem depends on definitions:  df-bi 117  df-dc 843  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-nel 2510  df-ral 2527  df-rex 2528  df-reu 2529  df-rmo 2530  df-rab 2531  df-v 2817  df-sbc 3045  df-csb 3141  df-dif 3215  df-un 3217  df-in 3219  df-ss 3226  df-nul 3511  df-if 3623  df-pw 3673  df-sn 3697  df-pr 3698  df-op 3700  df-uni 3917  df-int 3952  df-iun 3995  df-br 4112  df-opab 4174  df-mpt 4175  df-tr 4211  df-id 4416  df-po 4419  df-iso 4420  df-iord 4489  df-on 4491  df-ilim 4492  df-suc 4494  df-iom 4715  df-xp 4757  df-rel 4758  df-cnv 4759  df-co 4760  df-dm 4761  df-rn 4762  df-res 4763  df-ima 4764  df-iota 5314  df-fun 5356  df-fn 5357  df-f 5358  df-f1 5359  df-fo 5360  df-f1o 5361  df-fv 5362  df-riota 6005  df-ov 6055  df-oprab 6056  df-mpo 6057  df-1st 6336  df-2nd 6337  df-recs 6538  df-frec 6624  df-pnf 8315  df-mnf 8316  df-xr 8317  df-ltxr 8318  df-le 8319  df-sub 8451  df-neg 8452  df-reap 8854  df-ap 8861  df-div 8952  df-inn 9243  df-n0 9502  df-z 9583  df-uz 9860  df-seqfrec 10817  df-exp 10908

This theorem is referenced by:  expaddzaplem  10951  expaddzap  10952  expmul  10953  i4  11011  expaddd  11045  ef01bndlem  12450  modxai  13122  numexp2x  13131  2exp5  13138  2exp11  13142