Theorem fprodeq0 11584

Description: Any finite product containing a zero term is itself zero. (Contributed by Scott Fenton, 27-Dec-2017.)

Hypotheses

Ref	Expression
fprodeq0.1	|- Z = ( ZZ>= ` M )
fprodeq0.2	|- ( ph -> N e. Z )
fprodeq0.3	|- ( ( ph /\ k e. Z ) -> A e. CC )
fprodeq0.4	|- ( ( ph /\ k = N ) -> A = 0 )

Assertion

Ref	Expression
fprodeq0	|- ( ( ph /\ K e. ( ZZ>= ` N ) ) -> prod_ k e. ( M ... K ) A = 0 )

Distinct variable groups:   k, K   k, M   k, N   k, Z   ph, k

Allowed substitution hint:   A( k)

Proof of Theorem fprodeq0

Dummy variable j is distinct from all other variables.

Step	Hyp	Ref	Expression
1		eluzel2 9496	. . . . . . 7 |- ( K e. ( ZZ>= ` N ) -> N e. ZZ )
2	1	adantl 275	. . . . . 6 |- ( ( ph /\ K e. ( ZZ>= ` N ) ) -> N e. ZZ )
3	2	zred 9338	. . . . 5 |- ( ( ph /\ K e. ( ZZ>= ` N ) ) -> N e. RR )
4	3	ltp1d 8850	. . . 4 |- ( ( ph /\ K e. ( ZZ>= ` N ) ) -> N < ( N + 1 ) )
5		fzdisj 10012	. . . 4 |- ( N < ( N + 1 ) -> ( ( M ... N ) i^i ( ( N + 1 ) ... K ) ) = (/) )
6	4, 5	syl 14	. . 3 |- ( ( ph /\ K e. ( ZZ>= ` N ) ) -> ( ( M ... N ) i^i ( ( N + 1 ) ... K ) ) = (/) )
7		fprodeq0.2	. . . . . . . 8 |- ( ph -> N e. Z )
8		eluzel2 9496	. . . . . . . . 9 |- ( N e. ( ZZ>= ` M ) -> M e. ZZ )
9		fprodeq0.1	. . . . . . . . 9 |- Z = ( ZZ>= ` M )
10	8, 9	eleq2s 2266	. . . . . . . 8 |- ( N e. Z -> M e. ZZ )
11	7, 10	syl 14	. . . . . . 7 |- ( ph -> M e. ZZ )
12	11	adantr 274	. . . . . 6 |- ( ( ph /\ K e. ( ZZ>= ` N ) ) -> M e. ZZ )
13		eluzelz 9500	. . . . . . 7 |- ( K e. ( ZZ>= ` N ) -> K e. ZZ )
14	13	adantl 275	. . . . . 6 |- ( ( ph /\ K e. ( ZZ>= ` N ) ) -> K e. ZZ )
15	12, 14, 2	3jca 1173	. . . . 5 |- ( ( ph /\ K e. ( ZZ>= ` N ) ) -> ( M e. ZZ /\ K e. ZZ /\ N e. ZZ ) )
16		eluzle 9503	. . . . . . . 8 |- ( N e. ( ZZ>= ` M ) -> M <_ N )
17	16, 9	eleq2s 2266	. . . . . . 7 |- ( N e. Z -> M <_ N )
18	7, 17	syl 14	. . . . . 6 |- ( ph -> M <_ N )
19		eluzle 9503	. . . . . 6 |- ( K e. ( ZZ>= ` N ) -> N <_ K )
20	18, 19	anim12i 336	. . . . 5 |- ( ( ph /\ K e. ( ZZ>= ` N ) ) -> ( M <_ N /\ N <_ K ) )
21		elfz2 9976	. . . . 5 |- ( N e. ( M ... K ) <-> ( ( M e. ZZ /\ K e. ZZ /\ N e. ZZ ) /\ ( M <_ N /\ N <_ K ) ) )
22	15, 20, 21	sylanbrc 415	. . . 4 |- ( ( ph /\ K e. ( ZZ>= ` N ) ) -> N e. ( M ... K ) )
23		fzsplit 10011	. . . 4 |- ( N e. ( M ... K ) -> ( M ... K ) = ( ( M ... N ) u. ( ( N + 1 ) ... K ) ) )
24	22, 23	syl 14	. . 3 |- ( ( ph /\ K e. ( ZZ>= ` N ) ) -> ( M ... K ) = ( ( M ... N ) u. ( ( N + 1 ) ... K ) ) )
25	12, 14	fzfigd 10391	. . 3 |- ( ( ph /\ K e. ( ZZ>= ` N ) ) -> ( M ... K ) e. Fin )
26		elfzelz 9985	. . . . . 6 |- ( j e. ( M ... K ) -> j e. ZZ )
27	26	adantl 275	. . . . 5 |- ( ( ( ph /\ K e. ( ZZ>= ` N ) ) /\ j e. ( M ... K ) ) -> j e. ZZ )
28	12	adantr 274	. . . . 5 |- ( ( ( ph /\ K e. ( ZZ>= ` N ) ) /\ j e. ( M ... K ) ) -> M e. ZZ )
29	2	adantr 274	. . . . 5 |- ( ( ( ph /\ K e. ( ZZ>= ` N ) ) /\ j e. ( M ... K ) ) -> N e. ZZ )
30		fzdcel 10000	. . . . 5 |- ( ( j e. ZZ /\ M e. ZZ /\ N e. ZZ ) -> DECID j e. ( M ... N ) )
31	27, 28, 29, 30	syl3anc 1234	. . . 4 |- ( ( ( ph /\ K e. ( ZZ>= ` N ) ) /\ j e. ( M ... K ) ) -> DECID j e. ( M ... N ) )
32	31	ralrimiva 2544	. . 3 |- ( ( ph /\ K e. ( ZZ>= ` N ) ) -> A. j e. ( M ... K )DECID j e. ( M ... N ) )
33		elfzuz 9981	. . . . . 6 |- ( k e. ( M ... K ) -> k e. ( ZZ>= ` M ) )
34	33, 9	eleqtrrdi 2265	. . . . 5 |- ( k e. ( M ... K ) -> k e. Z )
35		fprodeq0.3	. . . . 5 |- ( ( ph /\ k e. Z ) -> A e. CC )
36	34, 35	sylan2 284	. . . 4 |- ( ( ph /\ k e. ( M ... K ) ) -> A e. CC )
37	36	adantlr 475	. . 3 |- ( ( ( ph /\ K e. ( ZZ>= ` N ) ) /\ k e. ( M ... K ) ) -> A e. CC )
38	6, 24, 25, 32, 37	fprodsplitdc 11563	. 2 |- ( ( ph /\ K e. ( ZZ>= ` N ) ) -> prod_ k e. ( M ... K ) A = ( prod_ k e. ( M ... N ) A x. prod_ k e. ( ( N + 1 ) ... K ) A ) )
39	7, 9	eleqtrdi 2264	. . . . . 6 |- ( ph -> N e. ( ZZ>= ` M ) )
40		elfzuz 9981	. . . . . . . 8 |- ( k e. ( M ... N ) -> k e. ( ZZ>= ` M ) )
41	40, 9	eleqtrrdi 2265	. . . . . . 7 |- ( k e. ( M ... N ) -> k e. Z )
42	41, 35	sylan2 284	. . . . . 6 |- ( ( ph /\ k e. ( M ... N ) ) -> A e. CC )
43	39, 42	fprodm1s 11568	. . . . 5 |- ( ph -> prod_ k e. ( M ... N ) A = ( prod_ k e. ( M ... ( N - 1 ) ) A x. [_ N / k ]_ A ) )
44		fprodeq0.4	. . . . . . 7 |- ( ( ph /\ k = N ) -> A = 0 )
45	7, 44	csbied 3096	. . . . . 6 |- ( ph -> [_ N / k ]_ A = 0 )
46	45	oveq2d 5873	. . . . 5 |- ( ph -> ( prod_ k e. ( M ... ( N - 1 ) ) A x. [_ N / k ]_ A ) = ( prod_ k e. ( M ... ( N - 1 ) ) A x. 0 ) )
47		eluzelz 9500	. . . . . . . . . 10 |- ( N e. ( ZZ>= ` M ) -> N e. ZZ )
48	39, 47	syl 14	. . . . . . . . 9 |- ( ph -> N e. ZZ )
49		peano2zm 9254	. . . . . . . . 9 |- ( N e. ZZ -> ( N - 1 ) e. ZZ )
50	48, 49	syl 14	. . . . . . . 8 |- ( ph -> ( N - 1 ) e. ZZ )
51	11, 50	fzfigd 10391	. . . . . . 7 |- ( ph -> ( M ... ( N - 1 ) ) e. Fin )
52		elfzuz 9981	. . . . . . . . 9 |- ( k e. ( M ... ( N - 1 ) ) -> k e. ( ZZ>= ` M ) )
53	52, 9	eleqtrrdi 2265	. . . . . . . 8 |- ( k e. ( M ... ( N - 1 ) ) -> k e. Z )
54	53, 35	sylan2 284	. . . . . . 7 |- ( ( ph /\ k e. ( M ... ( N - 1 ) ) ) -> A e. CC )
55	51, 54	fprodcl 11574	. . . . . 6 |- ( ph -> prod_ k e. ( M ... ( N - 1 ) ) A e. CC )
56	55	mul01d 8316	. . . . 5 |- ( ph -> ( prod_ k e. ( M ... ( N - 1 ) ) A x. 0 ) = 0 )
57	43, 46, 56	3eqtrd 2208	. . . 4 |- ( ph -> prod_ k e. ( M ... N ) A = 0 )
58	57	adantr 274	. . 3 |- ( ( ph /\ K e. ( ZZ>= ` N ) ) -> prod_ k e. ( M ... N ) A = 0 )
59	58	oveq1d 5872	. 2 |- ( ( ph /\ K e. ( ZZ>= ` N ) ) -> ( prod_ k e. ( M ... N ) A x. prod_ k e. ( ( N + 1 ) ... K ) A ) = ( 0 x. prod_ k e. ( ( N + 1 ) ... K ) A ) )
60	2	peano2zd 9341	. . . . 5 |- ( ( ph /\ K e. ( ZZ>= ` N ) ) -> ( N + 1 ) e. ZZ )
61	60, 14	fzfigd 10391	. . . 4 |- ( ( ph /\ K e. ( ZZ>= ` N ) ) -> ( ( N + 1 ) ... K ) e. Fin )
62	9	peano2uzs 9547	. . . . . . . . 9 |- ( N e. Z -> ( N + 1 ) e. Z )
63	7, 62	syl 14	. . . . . . . 8 |- ( ph -> ( N + 1 ) e. Z )
64		elfzuz 9981	. . . . . . . 8 |- ( k e. ( ( N + 1 ) ... K ) -> k e. ( ZZ>= ` ( N + 1 ) ) )
65	9	uztrn2 9508	. . . . . . . 8 |- ( ( ( N + 1 ) e. Z /\ k e. ( ZZ>= ` ( N + 1 ) ) ) -> k e. Z )
66	63, 64, 65	syl2an 287	. . . . . . 7 |- ( ( ph /\ k e. ( ( N + 1 ) ... K ) ) -> k e. Z )
67	66	adantrl 476	. . . . . 6 |- ( ( ph /\ ( K e. ( ZZ>= ` N ) /\ k e. ( ( N + 1 ) ... K ) ) ) -> k e. Z )
68	67, 35	syldan 280	. . . . 5 |- ( ( ph /\ ( K e. ( ZZ>= ` N ) /\ k e. ( ( N + 1 ) ... K ) ) ) -> A e. CC )
69	68	anassrs 398	. . . 4 |- ( ( ( ph /\ K e. ( ZZ>= ` N ) ) /\ k e. ( ( N + 1 ) ... K ) ) -> A e. CC )
70	61, 69	fprodcl 11574	. . 3 |- ( ( ph /\ K e. ( ZZ>= ` N ) ) -> prod_ k e. ( ( N + 1 ) ... K ) A e. CC )
71	70	mul02d 8315	. 2 |- ( ( ph /\ K e. ( ZZ>= ` N ) ) -> ( 0 x. prod_ k e. ( ( N + 1 ) ... K ) A ) = 0 )
72	38, 59, 71	3eqtrd 2208	1 |- ( ( ph /\ K e. ( ZZ>= ` N ) ) -> prod_ k e. ( M ... K ) A = 0 )

Syntax hints:   -> wi 4   /\ wa 103  DECID wdc 830   /\ w3a 974   = wceq 1349   e. wcel 2142   [_csb 3050   u. cun 3120   i^i cin 3121   (/)c0 3415   class class class wbr 3990   ` cfv 5200  (class class class)co 5857   CCcc 7776   0cc0 7778   1c1 7779   + caddc 7781   x. cmul 7783   < clt 7958   <_ cle 7959   - cmin 8094   ZZcz 9216   ZZ>=cuz 9491   ...cfz 9969   prod_cprod 11517

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 610  ax-in2 611  ax-io 705  ax-5 1441  ax-7 1442  ax-gen 1443  ax-ie1 1487  ax-ie2 1488  ax-8 1498  ax-10 1499  ax-11 1500  ax-i12 1501  ax-bndl 1503  ax-4 1504  ax-17 1520  ax-i9 1524  ax-ial 1528  ax-i5r 1529  ax-13 2144  ax-14 2145  ax-ext 2153  ax-coll 4105  ax-sep 4108  ax-nul 4116  ax-pow 4161  ax-pr 4195  ax-un 4419  ax-setind 4522  ax-iinf 4573  ax-cnex 7869  ax-resscn 7870  ax-1cn 7871  ax-1re 7872  ax-icn 7873  ax-addcl 7874  ax-addrcl 7875  ax-mulcl 7876  ax-mulrcl 7877  ax-addcom 7878  ax-mulcom 7879  ax-addass 7880  ax-mulass 7881  ax-distr 7882  ax-i2m1 7883  ax-0lt1 7884  ax-1rid 7885  ax-0id 7886  ax-rnegex 7887  ax-precex 7888  ax-cnre 7889  ax-pre-ltirr 7890  ax-pre-ltwlin 7891  ax-pre-lttrn 7892  ax-pre-apti 7893  ax-pre-ltadd 7894  ax-pre-mulgt0 7895  ax-pre-mulext 7896  ax-arch 7897  ax-caucvg 7898

This theorem depends on definitions:  df-bi 116  df-dc 831  df-3or 975  df-3an 976  df-tru 1352  df-fal 1355  df-nf 1455  df-sb 1757  df-eu 2023  df-mo 2024  df-clab 2158  df-cleq 2164  df-clel 2167  df-nfc 2302  df-ne 2342  df-nel 2437  df-ral 2454  df-rex 2455  df-reu 2456  df-rmo 2457  df-rab 2458  df-v 2733  df-sbc 2957  df-csb 3051  df-dif 3124  df-un 3126  df-in 3128  df-ss 3135  df-nul 3416  df-if 3528  df-pw 3569  df-sn 3590  df-pr 3591  df-op 3593  df-uni 3798  df-int 3833  df-iun 3876  df-br 3991  df-opab 4052  df-mpt 4053  df-tr 4089  df-id 4279  df-po 4282  df-iso 4283  df-iord 4352  df-on 4354  df-ilim 4355  df-suc 4357  df-iom 4576  df-xp 4618  df-rel 4619  df-cnv 4620  df-co 4621  df-dm 4622  df-rn 4623  df-res 4624  df-ima 4625  df-iota 5162  df-fun 5202  df-fn 5203  df-f 5204  df-f1 5205  df-fo 5206  df-f1o 5207  df-fv 5208  df-isom 5209  df-riota 5813  df-ov 5860  df-oprab 5861  df-mpo 5862  df-1st 6123  df-2nd 6124  df-recs 6288  df-irdg 6353  df-frec 6374  df-1o 6399  df-oadd 6403  df-er 6517  df-en 6723  df-dom 6724  df-fin 6725  df-pnf 7960  df-mnf 7961  df-xr 7962  df-ltxr 7963  df-le 7964  df-sub 8096  df-neg 8097  df-reap 8498  df-ap 8505  df-div 8594  df-inn 8883  df-2 8941  df-3 8942  df-4 8943  df-n0 9140  df-z 9217  df-uz 9492  df-q 9583  df-rp 9615  df-fz 9970  df-fzo 10103  df-seqfrec 10406  df-exp 10480  df-ihash 10714  df-cj 10810  df-re 10811  df-im 10812  df-rsqrt 10966  df-abs 10967  df-clim 11246  df-proddc 11518

This theorem is referenced by: (None)