Theorem expadd 10335

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 e. CC /\ M e. NN0 /\ N e. NN0 ) -> ( A ^ ( M + N ) ) = ( ( A ^ M ) x. ( 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 5782	. . . . . . 7 |- ( j = 0 -> ( M + j ) = ( M + 0 ) )
2	1	oveq2d 5790	. . . . . 6 |- ( j = 0 -> ( A ^ ( M + j ) ) = ( A ^ ( M + 0 ) ) )
3		oveq2 5782	. . . . . . 7 |- ( j = 0 -> ( A ^ j ) = ( A ^ 0 ) )
4	3	oveq2d 5790	. . . . . 6 |- ( j = 0 -> ( ( A ^ M ) x. ( A ^ j ) ) = ( ( A ^ M ) x. ( A ^ 0 ) ) )
5	2, 4	eqeq12d 2154	. . . . 5 |- ( j = 0 -> ( ( A ^ ( M + j ) ) = ( ( A ^ M ) x. ( A ^ j ) ) <-> ( A ^ ( M + 0 ) ) = ( ( A ^ M ) x. ( A ^ 0 ) ) ) )
6	5	imbi2d 229	. . . 4 |- ( j = 0 -> ( ( ( A e. CC /\ M e. NN0 ) -> ( A ^ ( M + j ) ) = ( ( A ^ M ) x. ( A ^ j ) ) ) <-> ( ( A e. CC /\ M e. NN0 ) -> ( A ^ ( M + 0 ) ) = ( ( A ^ M ) x. ( A ^ 0 ) ) ) ) )
7		oveq2 5782	. . . . . . 7 |- ( j = k -> ( M + j ) = ( M + k ) )
8	7	oveq2d 5790	. . . . . 6 |- ( j = k -> ( A ^ ( M + j ) ) = ( A ^ ( M + k ) ) )
9		oveq2 5782	. . . . . . 7 |- ( j = k -> ( A ^ j ) = ( A ^ k ) )
10	9	oveq2d 5790	. . . . . 6 |- ( j = k -> ( ( A ^ M ) x. ( A ^ j ) ) = ( ( A ^ M ) x. ( A ^ k ) ) )
11	8, 10	eqeq12d 2154	. . . . 5 |- ( j = k -> ( ( A ^ ( M + j ) ) = ( ( A ^ M ) x. ( A ^ j ) ) <-> ( A ^ ( M + k ) ) = ( ( A ^ M ) x. ( A ^ k ) ) ) )
12	11	imbi2d 229	. . . 4 |- ( j = k -> ( ( ( A e. CC /\ M e. NN0 ) -> ( A ^ ( M + j ) ) = ( ( A ^ M ) x. ( A ^ j ) ) ) <-> ( ( A e. CC /\ M e. NN0 ) -> ( A ^ ( M + k ) ) = ( ( A ^ M ) x. ( A ^ k ) ) ) ) )
13		oveq2 5782	. . . . . . 7 |- ( j = ( k + 1 ) -> ( M + j ) = ( M + ( k + 1 ) ) )
14	13	oveq2d 5790	. . . . . 6 |- ( j = ( k + 1 ) -> ( A ^ ( M + j ) ) = ( A ^ ( M + ( k + 1 ) ) ) )
15		oveq2 5782	. . . . . . 7 |- ( j = ( k + 1 ) -> ( A ^ j ) = ( A ^ ( k + 1 ) ) )
16	15	oveq2d 5790	. . . . . 6 |- ( j = ( k + 1 ) -> ( ( A ^ M ) x. ( A ^ j ) ) = ( ( A ^ M ) x. ( A ^ ( k + 1 ) ) ) )
17	14, 16	eqeq12d 2154	. . . . 5 |- ( j = ( k + 1 ) -> ( ( A ^ ( M + j ) ) = ( ( A ^ M ) x. ( A ^ j ) ) <-> ( A ^ ( M + ( k + 1 ) ) ) = ( ( A ^ M ) x. ( A ^ ( k + 1 ) ) ) ) )
18	17	imbi2d 229	. . . 4 |- ( j = ( k + 1 ) -> ( ( ( A e. CC /\ M e. NN0 ) -> ( A ^ ( M + j ) ) = ( ( A ^ M ) x. ( A ^ j ) ) ) <-> ( ( A e. CC /\ M e. NN0 ) -> ( A ^ ( M + ( k + 1 ) ) ) = ( ( A ^ M ) x. ( A ^ ( k + 1 ) ) ) ) ) )
19		oveq2 5782	. . . . . . 7 |- ( j = N -> ( M + j ) = ( M + N ) )
20	19	oveq2d 5790	. . . . . 6 |- ( j = N -> ( A ^ ( M + j ) ) = ( A ^ ( M + N ) ) )
21		oveq2 5782	. . . . . . 7 |- ( j = N -> ( A ^ j ) = ( A ^ N ) )
22	21	oveq2d 5790	. . . . . 6 |- ( j = N -> ( ( A ^ M ) x. ( A ^ j ) ) = ( ( A ^ M ) x. ( A ^ N ) ) )
23	20, 22	eqeq12d 2154	. . . . 5 |- ( j = N -> ( ( A ^ ( M + j ) ) = ( ( A ^ M ) x. ( A ^ j ) ) <-> ( A ^ ( M + N ) ) = ( ( A ^ M ) x. ( A ^ N ) ) ) )
24	23	imbi2d 229	. . . 4 |- ( j = N -> ( ( ( A e. CC /\ M e. NN0 ) -> ( A ^ ( M + j ) ) = ( ( A ^ M ) x. ( A ^ j ) ) ) <-> ( ( A e. CC /\ M e. NN0 ) -> ( A ^ ( M + N ) ) = ( ( A ^ M ) x. ( A ^ N ) ) ) ) )
25		nn0cn 8987	. . . . . . . . 9 |- ( M e. NN0 -> M e. CC )
26	25	addid1d 7911	. . . . . . . 8 |- ( M e. NN0 -> ( M + 0 ) = M )
27	26	adantl 275	. . . . . . 7 |- ( ( A e. CC /\ M e. NN0 ) -> ( M + 0 ) = M )
28	27	oveq2d 5790	. . . . . 6 |- ( ( A e. CC /\ M e. NN0 ) -> ( A ^ ( M + 0 ) ) = ( A ^ M ) )
29		expcl 10311	. . . . . . 7 |- ( ( A e. CC /\ M e. NN0 ) -> ( A ^ M ) e. CC )
30	29	mulid1d 7783	. . . . . 6 |- ( ( A e. CC /\ M e. NN0 ) -> ( ( A ^ M ) x. 1 ) = ( A ^ M ) )
31	28, 30	eqtr4d 2175	. . . . 5 |- ( ( A e. CC /\ M e. NN0 ) -> ( A ^ ( M + 0 ) ) = ( ( A ^ M ) x. 1 ) )
32		exp0 10297	. . . . . . 7 |- ( A e. CC -> ( A ^ 0 ) = 1 )
33	32	adantr 274	. . . . . 6 |- ( ( A e. CC /\ M e. NN0 ) -> ( A ^ 0 ) = 1 )
34	33	oveq2d 5790	. . . . 5 |- ( ( A e. CC /\ M e. NN0 ) -> ( ( A ^ M ) x. ( A ^ 0 ) ) = ( ( A ^ M ) x. 1 ) )
35	31, 34	eqtr4d 2175	. . . 4 |- ( ( A e. CC /\ M e. NN0 ) -> ( A ^ ( M + 0 ) ) = ( ( A ^ M ) x. ( A ^ 0 ) ) )
36		oveq1 5781	. . . . . . 7 |- ( ( A ^ ( M + k ) ) = ( ( A ^ M ) x. ( A ^ k ) ) -> ( ( A ^ ( M + k ) ) x. A ) = ( ( ( A ^ M ) x. ( A ^ k ) ) x. A ) )
37		nn0cn 8987	. . . . . . . . . . . 12 |- ( k e. NN0 -> k e. CC )
38		ax-1cn 7713	. . . . . . . . . . . . 13 |- 1 e. CC
39		addass 7750	. . . . . . . . . . . . 13 |- ( ( M e. CC /\ k e. CC /\ 1 e. CC ) -> ( ( M + k ) + 1 ) = ( M + ( k + 1 ) ) )
40	38, 39	mp3an3 1304	. . . . . . . . . . . 12 |- ( ( M e. CC /\ k e. CC ) -> ( ( M + k ) + 1 ) = ( M + ( k + 1 ) ) )
41	25, 37, 40	syl2an 287	. . . . . . . . . . 11 |- ( ( M e. NN0 /\ k e. NN0 ) -> ( ( M + k ) + 1 ) = ( M + ( k + 1 ) ) )
42	41	adantll 467	. . . . . . . . . 10 |- ( ( ( A e. CC /\ M e. NN0 ) /\ k e. NN0 ) -> ( ( M + k ) + 1 ) = ( M + ( k + 1 ) ) )
43	42	oveq2d 5790	. . . . . . . . 9 |- ( ( ( A e. CC /\ M e. NN0 ) /\ k e. NN0 ) -> ( A ^ ( ( M + k ) + 1 ) ) = ( A ^ ( M + ( k + 1 ) ) ) )
44		simpll 518	. . . . . . . . . 10 |- ( ( ( A e. CC /\ M e. NN0 ) /\ k e. NN0 ) -> A e. CC )
45		nn0addcl 9012	. . . . . . . . . . 11 |- ( ( M e. NN0 /\ k e. NN0 ) -> ( M + k ) e. NN0 )
46	45	adantll 467	. . . . . . . . . 10 |- ( ( ( A e. CC /\ M e. NN0 ) /\ k e. NN0 ) -> ( M + k ) e. NN0 )
47		expp1 10300	. . . . . . . . . 10 |- ( ( A e. CC /\ ( M + k ) e. NN0 ) -> ( A ^ ( ( M + k ) + 1 ) ) = ( ( A ^ ( M + k ) ) x. A ) )
48	44, 46, 47	syl2anc 408	. . . . . . . . 9 |- ( ( ( A e. CC /\ M e. NN0 ) /\ k e. NN0 ) -> ( A ^ ( ( M + k ) + 1 ) ) = ( ( A ^ ( M + k ) ) x. A ) )
49	43, 48	eqtr3d 2174	. . . . . . . 8 |- ( ( ( A e. CC /\ M e. NN0 ) /\ k e. NN0 ) -> ( A ^ ( M + ( k + 1 ) ) ) = ( ( A ^ ( M + k ) ) x. A ) )
50		expp1 10300	. . . . . . . . . . 11 |- ( ( A e. CC /\ k e. NN0 ) -> ( A ^ ( k + 1 ) ) = ( ( A ^ k ) x. A ) )
51	50	adantlr 468	. . . . . . . . . 10 |- ( ( ( A e. CC /\ M e. NN0 ) /\ k e. NN0 ) -> ( A ^ ( k + 1 ) ) = ( ( A ^ k ) x. A ) )
52	51	oveq2d 5790	. . . . . . . . 9 |- ( ( ( A e. CC /\ M e. NN0 ) /\ k e. NN0 ) -> ( ( A ^ M ) x. ( A ^ ( k + 1 ) ) ) = ( ( A ^ M ) x. ( ( A ^ k ) x. A ) ) )
53	29	adantr 274	. . . . . . . . . 10 |- ( ( ( A e. CC /\ M e. NN0 ) /\ k e. NN0 ) -> ( A ^ M ) e. CC )
54		expcl 10311	. . . . . . . . . . 11 |- ( ( A e. CC /\ k e. NN0 ) -> ( A ^ k ) e. CC )
55	54	adantlr 468	. . . . . . . . . 10 |- ( ( ( A e. CC /\ M e. NN0 ) /\ k e. NN0 ) -> ( A ^ k ) e. CC )
56	53, 55, 44	mulassd 7789	. . . . . . . . 9 |- ( ( ( A e. CC /\ M e. NN0 ) /\ k e. NN0 ) -> ( ( ( A ^ M ) x. ( A ^ k ) ) x. A ) = ( ( A ^ M ) x. ( ( A ^ k ) x. A ) ) )
57	52, 56	eqtr4d 2175	. . . . . . . 8 |- ( ( ( A e. CC /\ M e. NN0 ) /\ k e. NN0 ) -> ( ( A ^ M ) x. ( A ^ ( k + 1 ) ) ) = ( ( ( A ^ M ) x. ( A ^ k ) ) x. A ) )
58	49, 57	eqeq12d 2154	. . . . . . 7 |- ( ( ( A e. CC /\ M e. NN0 ) /\ k e. NN0 ) -> ( ( A ^ ( M + ( k + 1 ) ) ) = ( ( A ^ M ) x. ( A ^ ( k + 1 ) ) ) <-> ( ( A ^ ( M + k ) ) x. A ) = ( ( ( A ^ M ) x. ( A ^ k ) ) x. A ) ) )
59	36, 58	syl5ibr 155	. . . . . 6 |- ( ( ( A e. CC /\ M e. NN0 ) /\ k e. NN0 ) -> ( ( A ^ ( M + k ) ) = ( ( A ^ M ) x. ( A ^ k ) ) -> ( A ^ ( M + ( k + 1 ) ) ) = ( ( A ^ M ) x. ( A ^ ( k + 1 ) ) ) ) )
60	59	expcom 115	. . . . 5 |- ( k e. NN0 -> ( ( A e. CC /\ M e. NN0 ) -> ( ( A ^ ( M + k ) ) = ( ( A ^ M ) x. ( A ^ k ) ) -> ( A ^ ( M + ( k + 1 ) ) ) = ( ( A ^ M ) x. ( A ^ ( k + 1 ) ) ) ) ) )
61	60	a2d 26	. . . 4 |- ( k e. NN0 -> ( ( ( A e. CC /\ M e. NN0 ) -> ( A ^ ( M + k ) ) = ( ( A ^ M ) x. ( A ^ k ) ) ) -> ( ( A e. CC /\ M e. NN0 ) -> ( A ^ ( M + ( k + 1 ) ) ) = ( ( A ^ M ) x. ( A ^ ( k + 1 ) ) ) ) ) )
62	6, 12, 18, 24, 35, 61	nn0ind 9165	. . 3 |- ( N e. NN0 -> ( ( A e. CC /\ M e. NN0 ) -> ( A ^ ( M + N ) ) = ( ( A ^ M ) x. ( A ^ N ) ) ) )
63	62	expdcom 1418	. 2 |- ( A e. CC -> ( M e. NN0 -> ( N e. NN0 -> ( A ^ ( M + N ) ) = ( ( A ^ M ) x. ( A ^ N ) ) ) ) )
64	63	3imp 1175	1 |- ( ( A e. CC /\ M e. NN0 /\ N e. NN0 ) -> ( A ^ ( M + N ) ) = ( ( A ^ M ) x. ( A ^ N ) ) )

Syntax hints:   -> wi 4   /\ wa 103   /\ w3a 962   = wceq 1331   e. wcel 1480  (class class class)co 5774   CCcc 7618   0cc0 7620   1c1 7621   + caddc 7623   x. cmul 7625   NN0cn0 8977   ^cexp 10292

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 603  ax-in2 604  ax-io 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-13 1491  ax-14 1492  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2121  ax-coll 4043  ax-sep 4046  ax-nul 4054  ax-pow 4098  ax-pr 4131  ax-un 4355  ax-setind 4452  ax-iinf 4502  ax-cnex 7711  ax-resscn 7712  ax-1cn 7713  ax-1re 7714  ax-icn 7715  ax-addcl 7716  ax-addrcl 7717  ax-mulcl 7718  ax-mulrcl 7719  ax-addcom 7720  ax-mulcom 7721  ax-addass 7722  ax-mulass 7723  ax-distr 7724  ax-i2m1 7725  ax-0lt1 7726  ax-1rid 7727  ax-0id 7728  ax-rnegex 7729  ax-precex 7730  ax-cnre 7731  ax-pre-ltirr 7732  ax-pre-ltwlin 7733  ax-pre-lttrn 7734  ax-pre-apti 7735  ax-pre-ltadd 7736  ax-pre-mulgt0 7737  ax-pre-mulext 7738

This theorem depends on definitions:  df-bi 116  df-dc 820  df-3or 963  df-3an 964  df-tru 1334  df-fal 1337  df-nf 1437  df-sb 1736  df-eu 2002  df-mo 2003  df-clab 2126  df-cleq 2132  df-clel 2135  df-nfc 2270  df-ne 2309  df-nel 2404  df-ral 2421  df-rex 2422  df-reu 2423  df-rmo 2424  df-rab 2425  df-v 2688  df-sbc 2910  df-csb 3004  df-dif 3073  df-un 3075  df-in 3077  df-ss 3084  df-nul 3364  df-if 3475  df-pw 3512  df-sn 3533  df-pr 3534  df-op 3536  df-uni 3737  df-int 3772  df-iun 3815  df-br 3930  df-opab 3990  df-mpt 3991  df-tr 4027  df-id 4215  df-po 4218  df-iso 4219  df-iord 4288  df-on 4290  df-ilim 4291  df-suc 4293  df-iom 4505  df-xp 4545  df-rel 4546  df-cnv 4547  df-co 4548  df-dm 4549  df-rn 4550  df-res 4551  df-ima 4552  df-iota 5088  df-fun 5125  df-fn 5126  df-f 5127  df-f1 5128  df-fo 5129  df-f1o 5130  df-fv 5131  df-riota 5730  df-ov 5777  df-oprab 5778  df-mpo 5779  df-1st 6038  df-2nd 6039  df-recs 6202  df-frec 6288  df-pnf 7802  df-mnf 7803  df-xr 7804  df-ltxr 7805  df-le 7806  df-sub 7935  df-neg 7936  df-reap 8337  df-ap 8344  df-div 8433  df-inn 8721  df-n0 8978  df-z 9055  df-uz 9327  df-seqfrec 10219  df-exp 10293

This theorem is referenced by:  expaddzaplem  10336  expaddzap  10337  expmul  10338  i4  10395  expaddd  10426  ef01bndlem  11463