Theorem intfracq 10682

Description: Decompose a rational number, expressed as a ratio, into integer and fractional parts. The fractional part has a tighter bound than that of intqfrac2 10681. (Contributed by NM, 16-Aug-2008.)

Hypotheses

Ref	Expression
intfracq.1	|- Z = ( |_ ` ( M / N ) )
intfracq.2	|- F = ( ( M / N ) - Z )

Assertion

Ref	Expression
intfracq	|- ( ( M e. ZZ /\ N e. NN ) -> ( 0 <_ F /\ F <_ ( ( N - 1 ) / N ) /\ ( M / N ) = ( Z + F ) ) )

Proof of Theorem intfracq

Step	Hyp	Ref	Expression
1		znq 9956	. . . 4 |- ( ( M e. ZZ /\ N e. NN ) -> ( M / N ) e. QQ )
2		intfracq.1	. . . . 5 |- Z = ( |_ ` ( M / N ) )
3		intfracq.2	. . . . 5 |- F = ( ( M / N ) - Z )
4	2, 3	intqfrac2 10681	. . . 4 |- ( ( M / N ) e. QQ -> ( 0 <_ F /\ F < 1 /\ ( M / N ) = ( Z + F ) ) )
5	1, 4	syl 14	. . 3 |- ( ( M e. ZZ /\ N e. NN ) -> ( 0 <_ F /\ F < 1 /\ ( M / N ) = ( Z + F ) ) )
6	5	simp1d 1036	. 2 |- ( ( M e. ZZ /\ N e. NN ) -> 0 <_ F )
7		qfraclt1 10640	. . . . . . 7 |- ( ( M / N ) e. QQ -> ( ( M / N ) - ( |_ ` ( M / N ) ) ) < 1 )
8	1, 7	syl 14	. . . . . 6 |- ( ( M e. ZZ /\ N e. NN ) -> ( ( M / N ) - ( |_ ` ( M / N ) ) ) < 1 )
9	2	oveq2i 6061	. . . . . . . 8 |- ( ( M / N ) - Z ) = ( ( M / N ) - ( |_ ` ( M / N ) ) )
10	3, 9	eqtri 2253	. . . . . . 7 |- F = ( ( M / N ) - ( |_ ` ( M / N ) ) )
11	10	a1i 9	. . . . . 6 |- ( ( M e. ZZ /\ N e. NN ) -> F = ( ( M / N ) - ( |_ ` ( M / N ) ) ) )
12		simpr 110	. . . . . . . 8 |- ( ( M e. ZZ /\ N e. NN ) -> N e. NN )
13	12	nncnd 9251	. . . . . . 7 |- ( ( M e. ZZ /\ N e. NN ) -> N e. CC )
14	12	nnap0d 9283	. . . . . . 7 |- ( ( M e. ZZ /\ N e. NN ) -> N # 0 )
15	13, 14	dividapd 9060	. . . . . 6 |- ( ( M e. ZZ /\ N e. NN ) -> ( N / N ) = 1 )
16	8, 11, 15	3brtr4d 4141	. . . . 5 |- ( ( M e. ZZ /\ N e. NN ) -> F < ( N / N ) )
17		qre 9957	. . . . . . . . 9 |- ( ( M / N ) e. QQ -> ( M / N ) e. RR )
18	1, 17	syl 14	. . . . . . . 8 |- ( ( M e. ZZ /\ N e. NN ) -> ( M / N ) e. RR )
19	1	flqcld 10637	. . . . . . . . . 10 |- ( ( M e. ZZ /\ N e. NN ) -> ( |_ ` ( M / N ) ) e. ZZ )
20	2, 19	eqeltrid 2319	. . . . . . . . 9 |- ( ( M e. ZZ /\ N e. NN ) -> Z e. ZZ )
21	20	zred 9700	. . . . . . . 8 |- ( ( M e. ZZ /\ N e. NN ) -> Z e. RR )
22	18, 21	resubcld 8654	. . . . . . 7 |- ( ( M e. ZZ /\ N e. NN ) -> ( ( M / N ) - Z ) e. RR )
23	3, 22	eqeltrid 2319	. . . . . 6 |- ( ( M e. ZZ /\ N e. NN ) -> F e. RR )
24		nnre 9244	. . . . . . 7 |- ( N e. NN -> N e. RR )
25	24	adantl 277	. . . . . 6 |- ( ( M e. ZZ /\ N e. NN ) -> N e. RR )
26		nngt0 9262	. . . . . . . 8 |- ( N e. NN -> 0 < N )
27	24, 26	jca 306	. . . . . . 7 |- ( N e. NN -> ( N e. RR /\ 0 < N ) )
28	27	adantl 277	. . . . . 6 |- ( ( M e. ZZ /\ N e. NN ) -> ( N e. RR /\ 0 < N ) )
29		ltmuldiv2 9149	. . . . . 6 |- ( ( F e. RR /\ N e. RR /\ ( N e. RR /\ 0 < N ) ) -> ( ( N x. F ) < N <-> F < ( N / N ) ) )
30	23, 25, 28, 29	syl3anc 1274	. . . . 5 |- ( ( M e. ZZ /\ N e. NN ) -> ( ( N x. F ) < N <-> F < ( N / N ) ) )
31	16, 30	mpbird 167	. . . 4 |- ( ( M e. ZZ /\ N e. NN ) -> ( N x. F ) < N )
32	3	oveq2i 6061	. . . . . . 7 |- ( N x. F ) = ( N x. ( ( M / N ) - Z ) )
33	18	recnd 8302	. . . . . . . 8 |- ( ( M e. ZZ /\ N e. NN ) -> ( M / N ) e. CC )
34	20	zcnd 9701	. . . . . . . 8 |- ( ( M e. ZZ /\ N e. NN ) -> Z e. CC )
35	13, 33, 34	subdid 8687	. . . . . . 7 |- ( ( M e. ZZ /\ N e. NN ) -> ( N x. ( ( M / N ) - Z ) ) = ( ( N x. ( M / N ) ) - ( N x. Z ) ) )
36	32, 35	eqtrid 2277	. . . . . 6 |- ( ( M e. ZZ /\ N e. NN ) -> ( N x. F ) = ( ( N x. ( M / N ) ) - ( N x. Z ) ) )
37		zcn 9582	. . . . . . . . . 10 |- ( M e. ZZ -> M e. CC )
38	37	adantr 276	. . . . . . . . 9 |- ( ( M e. ZZ /\ N e. NN ) -> M e. CC )
39	38, 13, 14	divcanap2d 9066	. . . . . . . 8 |- ( ( M e. ZZ /\ N e. NN ) -> ( N x. ( M / N ) ) = M )
40		simpl 109	. . . . . . . 8 |- ( ( M e. ZZ /\ N e. NN ) -> M e. ZZ )
41	39, 40	eqeltrd 2309	. . . . . . 7 |- ( ( M e. ZZ /\ N e. NN ) -> ( N x. ( M / N ) ) e. ZZ )
42		nnz 9596	. . . . . . . . 9 |- ( N e. NN -> N e. ZZ )
43	42	adantl 277	. . . . . . . 8 |- ( ( M e. ZZ /\ N e. NN ) -> N e. ZZ )
44	43, 20	zmulcld 9706	. . . . . . 7 |- ( ( M e. ZZ /\ N e. NN ) -> ( N x. Z ) e. ZZ )
45	41, 44	zsubcld 9705	. . . . . 6 |- ( ( M e. ZZ /\ N e. NN ) -> ( ( N x. ( M / N ) ) - ( N x. Z ) ) e. ZZ )
46	36, 45	eqeltrd 2309	. . . . 5 |- ( ( M e. ZZ /\ N e. NN ) -> ( N x. F ) e. ZZ )
47		zltlem1 9635	. . . . 5 |- ( ( ( N x. F ) e. ZZ /\ N e. ZZ ) -> ( ( N x. F ) < N <-> ( N x. F ) <_ ( N - 1 ) ) )
48	46, 43, 47	syl2anc 411	. . . 4 |- ( ( M e. ZZ /\ N e. NN ) -> ( ( N x. F ) < N <-> ( N x. F ) <_ ( N - 1 ) ) )
49	31, 48	mpbid 147	. . 3 |- ( ( M e. ZZ /\ N e. NN ) -> ( N x. F ) <_ ( N - 1 ) )
50		peano2rem 8540	. . . . . 6 |- ( N e. RR -> ( N - 1 ) e. RR )
51	24, 50	syl 14	. . . . 5 |- ( N e. NN -> ( N - 1 ) e. RR )
52	51	adantl 277	. . . 4 |- ( ( M e. ZZ /\ N e. NN ) -> ( N - 1 ) e. RR )
53		lemuldiv2 9156	. . . 4 |- ( ( F e. RR /\ ( N - 1 ) e. RR /\ ( N e. RR /\ 0 < N ) ) -> ( ( N x. F ) <_ ( N - 1 ) <-> F <_ ( ( N - 1 ) / N ) ) )
54	23, 52, 28, 53	syl3anc 1274	. . 3 |- ( ( M e. ZZ /\ N e. NN ) -> ( ( N x. F ) <_ ( N - 1 ) <-> F <_ ( ( N - 1 ) / N ) ) )
55	49, 54	mpbid 147	. 2 |- ( ( M e. ZZ /\ N e. NN ) -> F <_ ( ( N - 1 ) / N ) )
56	5	simp3d 1038	. 2 |- ( ( M e. ZZ /\ N e. NN ) -> ( M / N ) = ( Z + F ) )
57	6, 55, 56	3jca 1204	1 |- ( ( M e. ZZ /\ N e. NN ) -> ( 0 <_ F /\ F <_ ( ( N - 1 ) / N ) /\ ( M / N ) = ( Z + F ) ) )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   /\ w3a 1005   = wceq 1398   e. wcel 2203   class class class wbr 4109   ` cfv 5352  (class class class)co 6050   CCcc 8125   RRcr 8126   0cc0 8127   1c1 8128   + caddc 8130   x. cmul 8132   < clt 8308   <_ cle 8309   - cmin 8444   / cdiv 8946   NNcn 9237   ZZcz 9577   QQcq 9951   |_cfl 10628

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 2205  ax-14 2206  ax-ext 2214  ax-sep 4228  ax-pow 4287  ax-pr 4322  ax-un 4554  ax-setind 4659  ax-cnex 8218  ax-resscn 8219  ax-1cn 8220  ax-1re 8221  ax-icn 8222  ax-addcl 8223  ax-addrcl 8224  ax-mulcl 8225  ax-mulrcl 8226  ax-addcom 8227  ax-mulcom 8228  ax-addass 8229  ax-mulass 8230  ax-distr 8231  ax-i2m1 8232  ax-0lt1 8233  ax-1rid 8234  ax-0id 8235  ax-rnegex 8236  ax-precex 8237  ax-cnre 8238  ax-pre-ltirr 8239  ax-pre-ltwlin 8240  ax-pre-lttrn 8241  ax-pre-apti 8242  ax-pre-ltadd 8243  ax-pre-mulgt0 8244  ax-pre-mulext 8245  ax-arch 8246

This theorem depends on definitions:  df-bi 117  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ne 2413  df-nel 2508  df-ral 2525  df-rex 2526  df-reu 2527  df-rmo 2528  df-rab 2529  df-v 2815  df-sbc 3043  df-csb 3139  df-dif 3213  df-un 3215  df-in 3217  df-ss 3224  df-pw 3671  df-sn 3695  df-pr 3696  df-op 3698  df-uni 3915  df-int 3950  df-iun 3993  df-br 4110  df-opab 4172  df-mpt 4173  df-id 4414  df-po 4417  df-iso 4418  df-xp 4755  df-rel 4756  df-cnv 4757  df-co 4758  df-dm 4759  df-rn 4760  df-res 4761  df-ima 4762  df-iota 5312  df-fun 5354  df-fn 5355  df-f 5356  df-fv 5360  df-riota 6003  df-ov 6053  df-oprab 6054  df-mpo 6055  df-1st 6334  df-2nd 6335  df-pnf 8310  df-mnf 8311  df-xr 8312  df-ltxr 8313  df-le 8314  df-sub 8446  df-neg 8447  df-reap 8849  df-ap 8856  df-div 8947  df-inn 9238  df-n0 9497  df-z 9578  df-q 9952  df-rp 9987  df-fl 10630

This theorem is referenced by:  flqdiv  10683