Theorem absexpt 6868

Description: Absolute value of natural number exponentiation.

Assertion

Ref	Expression
absexpt	|- ((A e. CC /\ N e. NN0) -> (abs` (A^N)) = ((abs` A)^N))

Proof of Theorem absexpt

Step	Hyp	Ref	Expression
1		opreq2 3969	. . . . . 6 |- (j = 0 -> (A^j) = (A^0))
2	1	fveq2d 3728	. . . . 5 |- (j = 0 -> (abs` (A^j)) = (abs` (A^0)))
3		opreq2 3969	. . . . 5 |- (j = 0 -> ((abs` A)^j) = ((abs` A)^0))
4	2, 3	eqeq12d 1489	. . . 4 |- (j = 0 -> ((abs` (A^j)) = ((abs` A)^j) <-> (abs` (A^0)) = ((abs` A)^0)))
5	4	imbi2d 612	. . 3 |- (j = 0 -> ((A e. CC -> (abs` (A^j)) = ((abs` A)^j)) <-> (A e. CC -> (abs` (A^0)) = ((abs` A)^0))))
6		opreq2 3969	. . . . . 6 |- (j = k -> (A^j) = (A^k))
7	6	fveq2d 3728	. . . . 5 |- (j = k -> (abs` (A^j)) = (abs` (A^k)))
8		opreq2 3969	. . . . 5 |- (j = k -> ((abs` A)^j) = ((abs` A)^k))
9	7, 8	eqeq12d 1489	. . . 4 |- (j = k -> ((abs` (A^j)) = ((abs` A)^j) <-> (abs` (A^k)) = ((abs` A)^k)))
10	9	imbi2d 612	. . 3 |- (j = k -> ((A e. CC -> (abs` (A^j)) = ((abs` A)^j)) <-> (A e. CC -> (abs` (A^k)) = ((abs` A)^k))))
11		opreq2 3969	. . . . . 6 |- (j = (k + 1) -> (A^j) = (A^(k + 1)))
12	11	fveq2d 3728	. . . . 5 |- (j = (k + 1) -> (abs` (A^j)) = (abs` (A^(k + 1))))
13		opreq2 3969	. . . . 5 |- (j = (k + 1) -> ((abs` A)^j) = ((abs` A)^(k + 1)))
14	12, 13	eqeq12d 1489	. . . 4 |- (j = (k + 1) -> ((abs` (A^j)) = ((abs` A)^j) <-> (abs` (A^(k + 1))) = ((abs` A)^(k + 1))))
15	14	imbi2d 612	. . 3 |- (j = (k + 1) -> ((A e. CC -> (abs` (A^j)) = ((abs` A)^j)) <-> (A e. CC -> (abs` (A^(k + 1))) = ((abs` A)^(k + 1)))))
16		opreq2 3969	. . . . . 6 |- (j = N -> (A^j) = (A^N))
17	16	fveq2d 3728	. . . . 5 |- (j = N -> (abs` (A^j)) = (abs` (A^N)))
18		opreq2 3969	. . . . 5 |- (j = N -> ((abs` A)^j) = ((abs` A)^N))
19	17, 18	eqeq12d 1489	. . . 4 |- (j = N -> ((abs` (A^j)) = ((abs` A)^j) <-> (abs` (A^N)) = ((abs` A)^N)))
20	19	imbi2d 612	. . 3 |- (j = N -> ((A e. CC -> (abs` (A^j)) = ((abs` A)^j)) <-> (A e. CC -> (abs` (A^N)) = ((abs` A)^N))))
21		0re 5440	. . . . . 6 |- 0 e. RR
22		1re 5435	. . . . . 6 |- 1 e. RR
23		lt01 5680	. . . . . 6 |- 0 < 1
24	21, 22, 23	ltlei 5581	. . . . 5 |- 0 <_ 1
25	22	absid 6861	. . . . 5 |- (0 <_ 1 -> (abs` 1) = 1)
26	24, 25	ax-mp 7	. . . 4 |- (abs` 1) = 1
27		exp0t 6571	. . . . 5 |- (A e. CC -> (A^0) = 1)
28	27	fveq2d 3728	. . . 4 |- (A e. CC -> (abs` (A^0)) = (abs` 1))
29		absclt 6833	. . . . . 6 |- (A e. CC -> (abs` A) e. RR)
30	29	recnd 5315	. . . . 5 |- (A e. CC -> (abs` A) e. CC)
31		exp0t 6571	. . . . 5 |- ((abs` A) e. CC -> ((abs` A)^0) = 1)
32	30, 31	syl 10	. . . 4 |- (A e. CC -> ((abs` A)^0) = 1)
33	26, 28, 32	3eqtr4a 1532	. . 3 |- (A e. CC -> (abs` (A^0)) = ((abs` A)^0))
34		opreq1 3968	. . . . . . . 8 |- ((abs` (A^k)) = ((abs` A)^k) -> ((abs` (A^k)) x. (abs` A)) = (((abs` A)^k) x. (abs` A)))
35	34	adantl 388	. . . . . . 7 |- (((A e. CC /\ k e. NN0) /\ (abs` (A^k)) = ((abs` A)^k)) -> ((abs` (A^k)) x. (abs` A)) = (((abs` A)^k) x. (abs` A)))
36		expp1t 6574	. . . . . . . . . 10 |- ((A e. CC /\ k e. NN0) -> (A^(k + 1)) = ((A^k) x. A))
37	36	fveq2d 3728	. . . . . . . . 9 |- ((A e. CC /\ k e. NN0) -> (abs` (A^(k + 1))) = (abs` ((A^k) x. A)))
38		absmult 6858	. . . . . . . . . 10 |- (((A^k) e. CC /\ A e. CC) -> (abs` ((A^k) x. A)) = ((abs` (A^k)) x. (abs` A)))
39		expclt 6581	. . . . . . . . . 10 |- ((A e. CC /\ k e. NN0) -> (A^k) e. CC)
40		pm3.26 319	. . . . . . . . . 10 |- ((A e. CC /\ k e. NN0) -> A e. CC)
41	38, 39, 40	sylanc 471	. . . . . . . . 9 |- ((A e. CC /\ k e. NN0) -> (abs` ((A^k) x. A)) = ((abs` (A^k)) x. (abs` A)))
42	37, 41	eqtrd 1507	. . . . . . . 8 |- ((A e. CC /\ k e. NN0) -> (abs` (A^(k + 1))) = ((abs` (A^k)) x. (abs` A)))
43	42	adantr 389	. . . . . . 7 |- (((A e. CC /\ k e. NN0) /\ (abs` (A^k)) = ((abs` A)^k)) -> (abs` (A^(k + 1))) = ((abs` (A^k)) x. (abs` A)))
44		expp1t 6574	. . . . . . . . 9 |- (((abs` A) e. CC /\ k e. NN0) -> ((abs` A)^(k + 1)) = (((abs` A)^k) x. (abs` A)))
45	44, 30	sylan 448	. . . . . . . 8 |- ((A e. CC /\ k e. NN0) -> ((abs` A)^(k + 1)) = (((abs` A)^k) x. (abs` A)))
46	45	adantr 389	. . . . . . 7 |- (((A e. CC /\ k e. NN0) /\ (abs` (A^k)) = ((abs` A)^k)) -> ((abs` A)^(k + 1)) = (((abs` A)^k) x. (abs` A)))
47	35, 43, 46	3eqtr4d 1517	. . . . . 6 |- (((A e. CC /\ k e. NN0) /\ (abs` (A^k)) = ((abs` A)^k)) -> (abs` (A^(k + 1))) = ((abs` A)^(k + 1)))
48	47	exp31 376	. . . . 5 |- (A e. CC -> (k e. NN0 -> ((abs` (A^k)) = ((abs` A)^k) -> (abs` (A^(k + 1))) = ((abs` A)^(k + 1)))))
49	48	com12 11	. . . 4 |- (k e. NN0 -> (A e. CC -> ((abs` (A^k)) = ((abs` A)^k) -> (abs` (A^(k + 1))) = ((abs` A)^(k + 1)))))
50	49	a2d 13	. . 3 |- (k e. NN0 -> ((A e. CC -> (abs` (A^k)) = ((abs` A)^k)) -> (A e. CC -> (abs` (A^(k + 1))) = ((abs` A)^(k + 1)))))
51	5, 10, 15, 20, 33, 50	nn0ind 6212	. 2 |- (N e. NN0 -> (A e. CC -> (abs` (A^N)) = ((abs` A)^N)))
52	51	impcom 351	1 |- ((A e. CC /\ N e. NN0) -> (abs` (A^N)) = ((abs` A)^N))

Syntax hints:   -> wi 3   /\ wa 223   = wceq 956   e. wcel 958   class class class wbr 2619  ` cfv 3182  (class class class)co 3963  CCcc 5232  0cc0 5234  1c1 5235   + caddc 5237   x. cmul 5239   <_ cle 5295  NN0cn0 5297  ^cexp 6568  abscabs 6750

This theorem is referenced by:  expcnv 7233  efaddlem10 7347  eftabs 7375  absefm1le 7412

This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 962  ax-gen 963  ax-8 964  ax-9 965  ax-10 966  ax-11 967  ax-12 968  ax-13 969  ax-14 970  ax-17 971  ax-4 973  ax-5o 975  ax-6o 978  ax-9o 1123  ax-10o 1140  ax-16 1210  ax-11o 1218  ax-ext 1459  ax-rep 2693  ax-sep 2703  ax-nul 2710  ax-pow 2742  ax-pr 2779  ax-un 2866  ax-inf2 4625

This theorem depends on definitions:  df-bi 147  df-or 224  df-an 225  df-3or 776  df-3an 777  df-ex 981  df-sb 1172  df-eu 1382  df-mo 1383  df-clab 1464  df-cleq 1469  df-clel 1472  df-ne 1587  df-nel 1588  df-ral 1649  df-rex 1650  df-reu 1651  df-rab 1652  df-v 1812  df-sbc 1942  df-csb 2002  df-dif 2049  df-un 2050  df-in 2051  df-ss 2053  df-pss 2055  df-nul 2281  df-if 2362  df-pw 2402  df-sn 2412  df-pr 2413  df-tp 2415  df-op 2416  df-uni 2504  df-int 2534  df-iun 2568  df-br 2620  df-opab 2667  df-tr 2681  df-eprel 2832  df-id 2835  df-po 2840  df-so 2850  df-fr 2917  df-we 2934  df-ord 2951  df-on 2952  df-lim 2953  df-suc 2954  df-om