Theorem intfracq 10735

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 10734. (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 10003	. . . 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 10734	. . . 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 1040	. 2 |- ( ( M e. ZZ /\ N e. NN ) -> 0 <_ F )
7		qfraclt1 10693	. . . . . . 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 6086	. . . . . . . 8 |- ( ( M / N ) - Z ) = ( ( M / N ) - ( |_ ` ( M / N ) ) )
10	3, 9	eqtri 2259	. . . . . . 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 9297	. . . . . . 7 |- ( ( M e. ZZ /\ N e. NN ) -> N e. CC )
14	12	nnap0d 9329	. . . . . . 7 |- ( ( M e. ZZ /\ N e. NN ) -> N # 0 )
15	13, 14	dividapd 9106	. . . . . 6 |- ( ( M e. ZZ /\ N e. NN ) -> ( N / N ) = 1 )
16	8, 11, 15	3brtr4d 4157	. . . . 5 |- ( ( M e. ZZ /\ N e. NN ) -> F < ( N / N ) )
17		qre 10004	. . . . . . . . 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 10690	. . . . . . . . . 10 |- ( ( M e. ZZ /\ N e. NN ) -> ( |_ ` ( M / N ) ) e. ZZ )
20	2, 19	eqeltrid 2325	. . . . . . . . 9 |- ( ( M e. ZZ /\ N e. NN ) -> Z e. ZZ )
21	20	zred 9747	. . . . . . . 8 |- ( ( M e. ZZ /\ N e. NN ) -> Z e. RR )
22	18, 21	resubcld 8698	. . . . . . 7 |- ( ( M e. ZZ /\ N e. NN ) -> ( ( M / N ) - Z ) e. RR )
23	3, 22	eqeltrid 2325	. . . . . 6 |- ( ( M e. ZZ /\ N e. NN ) -> F e. RR )
24		nnre 9290	. . . . . . 7 |- ( N e. NN -> N e. RR )
25	24	adantl 277	. . . . . 6 |- ( ( M e. ZZ /\ N e. NN ) -> N e. RR )
26		nngt0 9308	. . . . . . . 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 9195	. . . . . 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 1278	. . . . 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 6086	. . . . . . 7 |- ( N x. F ) = ( N x. ( ( M / N ) - Z ) )
33	18	recnd 8344	. . . . . . . 8 |- ( ( M e. ZZ /\ N e. NN ) -> ( M / N ) e. CC )
34	20	zcnd 9748	. . . . . . . 8 |- ( ( M e. ZZ /\ N e. NN ) -> Z e. CC )
35	13, 33, 34	subdid 8731	. . . . . . 7 |- ( ( M e. ZZ /\ N e. NN ) -> ( N x. ( ( M / N ) - Z ) ) = ( ( N x. ( M / N ) ) - ( N x. Z ) ) )
36	32, 35	eqtrid 2283	. . . . . 6 |- ( ( M e. ZZ /\ N e. NN ) -> ( N x. F ) = ( ( N x. ( M / N ) ) - ( N x. Z ) ) )
37		zcn 9628	. . . . . . . . . 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 9112	. . . . . . . 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 2315	. . . . . . 7 |- ( ( M e. ZZ /\ N e. NN ) -> ( N x. ( M / N ) ) e. ZZ )
42		nnz 9642	. . . . . . . . 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 9753	. . . . . . 7 |- ( ( M e. ZZ /\ N e. NN ) -> ( N x. Z ) e. ZZ )
45	41, 44	zsubcld 9752	. . . . . 6 |- ( ( M e. ZZ /\ N e. NN ) -> ( ( N x. ( M / N ) ) - ( N x. Z ) ) e. ZZ )
46	36, 45	eqeltrd 2315	. . . . 5 |- ( ( M e. ZZ /\ N e. NN ) -> ( N x. F ) e. ZZ )
47		zltlem1 9681	. . . . 5 |- ( ( ( N x. F ) e. ZZ /\ N e. ZZ ) -> ( ( N x. F ) < N <-> ( N x. F ) <_ ( N - 1 ) ) )
48	46, 43, 47	syl2anc 415	. . . 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 8583	. . . . . 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 9202	. . . 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 1278	. . 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 1042	. 2 |- ( ( M e. ZZ /\ N e. NN ) -> ( M / N ) = ( Z + F ) )
57	6, 55, 56	3jca 1208	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 1009   = wceq 1402   e. wcel 2209   class class class wbr 4125   ` cfv 5372  (class class class)co 6075   CCcc 8167   RRcr 8168   0cc0 8169   1c1 8170   + caddc 8172   x. cmul 8174   < clt 8350   <_ cle 8351   - cmin 8487   / cdiv 8992   NNcn 9283   ZZcz 9623   QQcq 9998   |_cfl 10681

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 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4244  ax-pow 4306  ax-pr 4341  ax-un 4573  ax-setind 4679  ax-cnex 8260  ax-resscn 8261  ax-1cn 8262  ax-1re 8263  ax-icn 8264  ax-addcl 8265  ax-addrcl 8266  ax-mulcl 8267  ax-mulrcl 8268  ax-addcom 8269  ax-mulcom 8270  ax-addass 8271  ax-mulass 8272  ax-distr 8273  ax-i2m1 8274  ax-0lt1 8275  ax-1rid 8276  ax-0id 8277  ax-rnegex 8278  ax-precex 8279  ax-cnre 8280  ax-pre-ltirr 8281  ax-pre-ltwlin 8282  ax-pre-lttrn 8283  ax-pre-apti 8284  ax-pre-ltadd 8285  ax-pre-mulgt0 8286  ax-pre-mulext 8287  ax-arch 8288

This theorem depends on definitions:  df-bi 117  df-3or 1010  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-reu 2535  df-rmo 2536  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-int 3966  df-iun 4009  df-br 4126  df-opab 4188  df-mpt 4189  df-id 4433  df-po 4436  df-iso 4437  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-rn 4780  df-res 4781  df-ima 4782  df-iota 5332  df-fun 5374  df-fn 5375  df-f 5376  df-fv 5380  df-riota 6028  df-ov 6078  df-oprab 6079  df-mpo 6080  df-1st 6364  df-2nd 6365  df-pnf 8352  df-mnf 8353  df-xr 8354  df-ltxr 8355  df-le 8356  df-sub 8489  df-neg 8490  df-reap 8893  df-ap 8900  df-div 8993  df-inn 9284  df-n0 9543  df-z 9624  df-q 9999  df-rp 10034  df-fl 10683

This theorem is referenced by:  flqdiv  10736