Theorem hashgcdeq 11647

Description: Number of initial positive integers with specified divisors. (Contributed by Stefan O'Rear, 12-Sep-2015.)

Assertion

Ref	Expression
hashgcdeq	|- ( ( M e. NN /\ N e. NN ) -> (♯ ` { x e. ( 0..^ M ) | ( x gcd M ) = N } ) = if ( N || M , ( phi ` ( M / N ) ) , 0 ) )

Distinct variable groups:   x, M   x, N

Proof of Theorem hashgcdeq

Dummy variables z y are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		eqeq2 2104	. 2 |- ( ( phi ` ( M / N ) ) = if ( N || M , ( phi ` ( M / N ) ) , 0 ) -> ( (♯ ` { x e. ( 0..^ M ) | ( x gcd M ) = N } ) = ( phi ` ( M / N ) ) <-> (♯ ` { x e. ( 0..^ M ) | ( x gcd M ) = N } ) = if ( N || M , ( phi ` ( M / N ) ) , 0 ) ) )
2		eqeq2 2104	. 2 |- ( 0 = if ( N || M , ( phi ` ( M / N ) ) , 0 ) -> ( (♯ ` { x e. ( 0..^ M ) | ( x gcd M ) = N } ) = 0 <-> (♯ ` { x e. ( 0..^ M ) | ( x gcd M ) = N } ) = if ( N || M , ( phi ` ( M / N ) ) , 0 ) ) )
3		nndivdvds 11245	. . . . 5 |- ( ( M e. NN /\ N e. NN ) -> ( N || M <-> ( M / N ) e. NN ) )
4	3	biimpa 291	. . . 4 |- ( ( ( M e. NN /\ N e. NN ) /\ N || M ) -> ( M / N ) e. NN )
5		dfphi2 11639	. . . 4 |- ( ( M / N ) e. NN -> ( phi ` ( M / N ) ) = (♯ ` { y e. ( 0..^ ( M / N ) ) | ( y gcd ( M / N ) ) = 1 } ) )
6	4, 5	syl 14	. . 3 |- ( ( ( M e. NN /\ N e. NN ) /\ N || M ) -> ( phi ` ( M / N ) ) = (♯ ` { y e. ( 0..^ ( M / N ) ) | ( y gcd ( M / N ) ) = 1 } ) )
7		0z 8859	. . . . . 6 |- 0 e. ZZ
8	4	nnzd 8966	. . . . . 6 |- ( ( ( M e. NN /\ N e. NN ) /\ N || M ) -> ( M / N ) e. ZZ )
9		fzofig 9988	. . . . . 6 |- ( ( 0 e. ZZ /\ ( M / N ) e. ZZ ) -> ( 0..^ ( M / N ) ) e. Fin )
10	7, 8, 9	sylancr 406	. . . . 5 |- ( ( ( M e. NN /\ N e. NN ) /\ N || M ) -> ( 0..^ ( M / N ) ) e. Fin )
11		elfzoelz 9707	. . . . . . . . . 10 |- ( y e. ( 0..^ ( M / N ) ) -> y e. ZZ )
12	11	adantl 272	. . . . . . . . 9 |- ( ( ( ( M e. NN /\ N e. NN ) /\ N || M ) /\ y e. ( 0..^ ( M / N ) ) ) -> y e. ZZ )
13	8	adantr 271	. . . . . . . . 9 |- ( ( ( ( M e. NN /\ N e. NN ) /\ N || M ) /\ y e. ( 0..^ ( M / N ) ) ) -> ( M / N ) e. ZZ )
14	12, 13	gcdcld 11403	. . . . . . . 8 |- ( ( ( ( M e. NN /\ N e. NN ) /\ N || M ) /\ y e. ( 0..^ ( M / N ) ) ) -> ( y gcd ( M / N ) ) e. NN0 )
15	14	nn0zd 8965	. . . . . . 7 |- ( ( ( ( M e. NN /\ N e. NN ) /\ N || M ) /\ y e. ( 0..^ ( M / N ) ) ) -> ( y gcd ( M / N ) ) e. ZZ )
16		1zzd 8875	. . . . . . 7 |- ( ( ( ( M e. NN /\ N e. NN ) /\ N || M ) /\ y e. ( 0..^ ( M / N ) ) ) -> 1 e. ZZ )
17		zdceq 8920	. . . . . . 7 |- ( ( ( y gcd ( M / N ) ) e. ZZ /\ 1 e. ZZ ) -> DECID ( y gcd ( M / N ) ) = 1 )
18	15, 16, 17	syl2anc 404	. . . . . 6 |- ( ( ( ( M e. NN /\ N e. NN ) /\ N || M ) /\ y e. ( 0..^ ( M / N ) ) ) -> DECID ( y gcd ( M / N ) ) = 1 )
19	18	ralrimiva 2458	. . . . 5 |- ( ( ( M e. NN /\ N e. NN ) /\ N || M ) -> A. y e. ( 0..^ ( M / N ) )DECID ( y gcd ( M / N ) ) = 1 )
20	10, 19	ssfirab 6723	. . . 4 |- ( ( ( M e. NN /\ N e. NN ) /\ N || M ) -> { y e. ( 0..^ ( M / N ) ) | ( y gcd ( M / N ) ) = 1 } e. Fin )
21		eqid 2095	. . . . . 6 |- { y e. ( 0..^ ( M / N ) ) | ( y gcd ( M / N ) ) = 1 } = { y e. ( 0..^ ( M / N ) ) | ( y gcd ( M / N ) ) = 1 }
22		eqid 2095	. . . . . 6 |- { x e. ( 0..^ M ) | ( x gcd M ) = N } = { x e. ( 0..^ M ) | ( x gcd M ) = N }
23		eqid 2095	. . . . . 6 |- ( z e. { y e. ( 0..^ ( M / N ) ) | ( y gcd ( M / N ) ) = 1 } |-> ( z x. N ) ) = ( z e. { y e. ( 0..^ ( M / N ) ) | ( y gcd ( M / N ) ) = 1 } |-> ( z x. N ) )
24	21, 22, 23	hashgcdlem 11646	. . . . 5 |- ( ( M e. NN /\ N e. NN /\ N || M ) -> ( z e. { y e. ( 0..^ ( M / N ) ) | ( y gcd ( M / N ) ) = 1 } |-> ( z x. N ) ) : { y e. ( 0..^ ( M / N ) ) | ( y gcd ( M / N ) ) = 1 } -1-1-onto-> { x e. ( 0..^ M ) | ( x gcd M ) = N } )
25	24	3expa 1146	. . . 4 |- ( ( ( M e. NN /\ N e. NN ) /\ N || M ) -> ( z e. { y e. ( 0..^ ( M / N ) ) | ( y gcd ( M / N ) ) = 1 } |-> ( z x. N ) ) : { y e. ( 0..^ ( M / N ) ) | ( y gcd ( M / N ) ) = 1 } -1-1-onto-> { x e. ( 0..^ M ) | ( x gcd M ) = N } )
26	20, 25	fihasheqf1od 10329	. . 3 |- ( ( ( M e. NN /\ N e. NN ) /\ N || M ) -> (♯ ` { y e. ( 0..^ ( M / N ) ) | ( y gcd ( M / N ) ) = 1 } ) = (♯ ` { x e. ( 0..^ M ) | ( x gcd M ) = N } ) )
27	6, 26	eqtr2d 2128	. 2 |- ( ( ( M e. NN /\ N e. NN ) /\ N || M ) -> (♯ ` { x e. ( 0..^ M ) | ( x gcd M ) = N } ) = ( phi ` ( M / N ) ) )
28		simprr 500	. . . . . . . . . 10 |- ( ( ( M e. NN /\ N e. NN ) /\ ( x e. ( 0..^ M ) /\ ( x gcd M ) = N ) ) -> ( x gcd M ) = N )
29		elfzoelz 9707	. . . . . . . . . . . . 13 |- ( x e. ( 0..^ M ) -> x e. ZZ )
30	29	ad2antrl 475	. . . . . . . . . . . 12 |- ( ( ( M e. NN /\ N e. NN ) /\ ( x e. ( 0..^ M ) /\ ( x gcd M ) = N ) ) -> x e. ZZ )
31		nnz 8867	. . . . . . . . . . . . 13 |- ( M e. NN -> M e. ZZ )
32	31	ad2antrr 473	. . . . . . . . . . . 12 |- ( ( ( M e. NN /\ N e. NN ) /\ ( x e. ( 0..^ M ) /\ ( x gcd M ) = N ) ) -> M e. ZZ )
33		gcddvds 11398	. . . . . . . . . . . 12 |- ( ( x e. ZZ /\ M e. ZZ ) -> ( ( x gcd M ) || x /\ ( x gcd M ) || M ) )
34	30, 32, 33	syl2anc 404	. . . . . . . . . . 11 |- ( ( ( M e. NN /\ N e. NN ) /\ ( x e. ( 0..^ M ) /\ ( x gcd M ) = N ) ) -> ( ( x gcd M ) || x /\ ( x gcd M ) || M ) )
35	34	simprd 113	. . . . . . . . . 10 |- ( ( ( M e. NN /\ N e. NN ) /\ ( x e. ( 0..^ M ) /\ ( x gcd M ) = N ) ) -> ( x gcd M ) || M )
36	28, 35	eqbrtrrd 3889	. . . . . . . . 9 |- ( ( ( M e. NN /\ N e. NN ) /\ ( x e. ( 0..^ M ) /\ ( x gcd M ) = N ) ) -> N || M )
37	36	expr 368	. . . . . . . 8 |- ( ( ( M e. NN /\ N e. NN ) /\ x e. ( 0..^ M ) ) -> ( ( x gcd M ) = N -> N || M ) )
38	37	con3d 599	. . . . . . 7 |- ( ( ( M e. NN /\ N e. NN ) /\ x e. ( 0..^ M ) ) -> ( -. N || M -> -. ( x gcd M ) = N ) )
39	38	impancom 257	. . . . . 6 |- ( ( ( M e. NN /\ N e. NN ) /\ -. N || M ) -> ( x e. ( 0..^ M ) -> -. ( x gcd M ) = N ) )
40	39	ralrimiv 2457	. . . . 5 |- ( ( ( M e. NN /\ N e. NN ) /\ -. N || M ) -> A. x e. ( 0..^ M ) -. ( x gcd M ) = N )
41		rabeq0 3331	. . . . 5 |- ( { x e. ( 0..^ M ) | ( x gcd M ) = N } = (/) <-> A. x e. ( 0..^ M ) -. ( x gcd M ) = N )
42	40, 41	sylibr 133	. . . 4 |- ( ( ( M e. NN /\ N e. NN ) /\ -. N || M ) -> { x e. ( 0..^ M ) | ( x gcd M ) = N } = (/) )
43	42	fveq2d 5344	. . 3 |- ( ( ( M e. NN /\ N e. NN ) /\ -. N || M ) -> (♯ ` { x e. ( 0..^ M ) | ( x gcd M ) = N } ) = (♯ ` (/) ) )
44		hash0 10336	. . 3 |- (♯ ` (/) ) = 0
45	43, 44	syl6eq 2143	. 2 |- ( ( ( M e. NN /\ N e. NN ) /\ -. N || M ) -> (♯ ` { x e. ( 0..^ M ) | ( x gcd M ) = N } ) = 0 )
46		dvdsdc 11247	. . . 4 |- ( ( N e. NN /\ M e. ZZ ) -> DECID N || M )
47	31, 46	sylan2 281	. . 3 |- ( ( N e. NN /\ M e. NN ) -> DECID N || M )
48	47	ancoms 265	. 2 |- ( ( M e. NN /\ N e. NN ) -> DECID N || M )
49	1, 2, 27, 45, 48	ifbothdadc 3442	1 |- ( ( M e. NN /\ N e. NN ) -> (♯ ` { x e. ( 0..^ M ) | ( x gcd M ) = N } ) = if ( N || M , ( phi ` ( M / N ) ) , 0 ) )

Syntax hints:   -. wn 3   -> wi 4   /\ wa 103  DECID wdc 783   = wceq 1296   e. wcel 1445   A.wral 2370   {crab 2374   (/)c0 3302   ifcif 3413   class class class wbr 3867   |-> cmpt 3921   -1-1-onto->wf1o 5048   ` cfv 5049  (class class class)co 5690   Fincfn 6537   0cc0 7447   1c1 7448   x. cmul 7452   / cdiv 8236   NNcn 8520   ZZcz 8848  ..^cfzo 9702  ♯chash 10314   || cdvds 11239   gcd cgcd 11381   phicphi 11629

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 582  ax-in2 583  ax-io 668  ax-5 1388  ax-7 1389  ax-gen 1390  ax-ie1 1434  ax-ie2 1435  ax-8 1447  ax-10 1448  ax-11 1449  ax-i12 1450  ax-bndl 1451  ax-4 1452  ax-13 1456  ax-14 1457  ax-17 1471  ax-i9 1475  ax-ial 1479  ax-i5r 1480  ax-ext 2077  ax-coll 3975  ax-sep 3978  ax-nul 3986  ax-pow 4030  ax-pr 4060  ax-un 4284  ax-setind 4381  ax-iinf 4431  ax-cnex 7533  ax-resscn 7534  ax-1cn 7535  ax-1re 7536  ax-icn 7537  ax-addcl 7538  ax-addrcl 7539  ax-mulcl 7540  ax-mulrcl 7541  ax-addcom 7542  ax-mulcom 7543  ax-addass 7544  ax-mulass 7545  ax-distr 7546  ax-i2m1 7547  ax-0lt1 7548  ax-1rid 7549  ax-0id 7550  ax-rnegex 7551  ax-precex 7552  ax-cnre 7553  ax-pre-ltirr 7554  ax-pre-ltwlin 7555  ax-pre-lttrn 7556  ax-pre-apti 7557  ax-pre-ltadd 7558  ax-pre-mulgt0 7559  ax-pre-mulext 7560  ax-arch 7561  ax-caucvg 7562

This theorem depends on definitions:  df-bi 116  df-dc 784  df-3or 928  df-3an 929  df-tru 1299  df-fal 1302  df-nf 1402  df-sb 1700  df-eu 1958  df-mo 1959  df-clab 2082  df-cleq 2088  df-clel 2091  df-nfc 2224  df-ne 2263  df-nel 2358  df-ral 2375  df-rex 2376  df-reu 2377  df-rmo 2378  df-rab 2379  df-v 2635  df-sbc 2855  df-csb 2948  df-dif 3015  df-un 3017  df-in 3019  df-ss 3026  df-nul 3303  df-if 3414  df-pw 3451  df-sn 3472  df-pr 3473  df-op 3475  df-uni 3676  df-int 3711  df-iun 3754  df-br 3868  df-opab 3922  df-mpt 3923  df-tr 3959  df-id 4144  df-po 4147  df-iso 4148  df-iord 4217  df-on 4219  df-ilim 4220  df-suc 4222  df-iom 4434  df-xp 4473  df-rel 4474  df-cnv 4475  df-co 4476  df-dm 4477  df-rn 4478  df-res 4479  df-ima 4480  df-iota 5014  df-fun 5051  df-fn 5052  df-f 5053  df-f1 5054  df-fo 5055  df-f1o 5056  df-fv 5057  df-riota 5646  df-ov 5693  df-oprab 5694  df-mpt2 5695  df-1st 5949  df-2nd 5950  df-recs 6108  df-frec 6194  df-1o 6219  df-er 6332  df-en 6538  df-dom 6539  df-fin 6540  df-sup 6759  df-pnf 7621  df-mnf 7622  df-xr 7623  df-ltxr 7624  df-le 7625  df-sub 7752  df-neg 7753  df-reap 8149  df-ap 8156  df-div 8237  df-inn 8521  df-2 8579  df-3 8580  df-4 8581  df-n0 8772  df-z 8849  df-uz 9119  df-q 9204  df-rp 9234  df-fz 9574  df-fzo 9703  df-fl 9826  df-mod 9879  df-iseq 10002  df-seq3 10003  df-exp 10086  df-ihash 10315  df-cj 10407  df-re 10408  df-im 10409  df-rsqrt 10562  df-abs 10563  df-dvds 11240  df-gcd 11382  df-phi 11630

This theorem is referenced by: (None)