Theorem hashgcdeq 12256

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 2198	. 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 2198	. 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 11820	. . . . 5 |- ( ( M e. NN /\ N e. NN ) -> ( N || M <-> ( M / N ) e. NN ) )
4	3	biimpa 296	. . . 4 |- ( ( ( M e. NN /\ N e. NN ) /\ N || M ) -> ( M / N ) e. NN )
5		dfphi2 12237	. . . 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 9281	. . . . . 6 |- 0 e. ZZ
8	4	nnzd 9391	. . . . . 6 |- ( ( ( M e. NN /\ N e. NN ) /\ N || M ) -> ( M / N ) e. ZZ )
9		fzofig 10449	. . . . . 6 |- ( ( 0 e. ZZ /\ ( M / N ) e. ZZ ) -> ( 0..^ ( M / N ) ) e. Fin )
10	7, 8, 9	sylancr 414	. . . . 5 |- ( ( ( M e. NN /\ N e. NN ) /\ N || M ) -> ( 0..^ ( M / N ) ) e. Fin )
11		elfzoelz 10164	. . . . . . . . . 10 |- ( y e. ( 0..^ ( M / N ) ) -> y e. ZZ )
12	11	adantl 277	. . . . . . . . 9 |- ( ( ( ( M e. NN /\ N e. NN ) /\ N || M ) /\ y e. ( 0..^ ( M / N ) ) ) -> y e. ZZ )
13	8	adantr 276	. . . . . . . . 9 |- ( ( ( ( M e. NN /\ N e. NN ) /\ N || M ) /\ y e. ( 0..^ ( M / N ) ) ) -> ( M / N ) e. ZZ )
14	12, 13	gcdcld 11986	. . . . . . . 8 |- ( ( ( ( M e. NN /\ N e. NN ) /\ N || M ) /\ y e. ( 0..^ ( M / N ) ) ) -> ( y gcd ( M / N ) ) e. NN0 )
15	14	nn0zd 9390	. . . . . . 7 |- ( ( ( ( M e. NN /\ N e. NN ) /\ N || M ) /\ y e. ( 0..^ ( M / N ) ) ) -> ( y gcd ( M / N ) ) e. ZZ )
16		1zzd 9297	. . . . . . 7 |- ( ( ( ( M e. NN /\ N e. NN ) /\ N || M ) /\ y e. ( 0..^ ( M / N ) ) ) -> 1 e. ZZ )
17		zdceq 9345	. . . . . . 7 |- ( ( ( y gcd ( M / N ) ) e. ZZ /\ 1 e. ZZ ) -> DECID ( y gcd ( M / N ) ) = 1 )
18	15, 16, 17	syl2anc 411	. . . . . 6 |- ( ( ( ( M e. NN /\ N e. NN ) /\ N || M ) /\ y e. ( 0..^ ( M / N ) ) ) -> DECID ( y gcd ( M / N ) ) = 1 )
19	18	ralrimiva 2562	. . . . 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 6950	. . . 4 |- ( ( ( M e. NN /\ N e. NN ) /\ N || M ) -> { y e. ( 0..^ ( M / N ) ) | ( y gcd ( M / N ) ) = 1 } e. Fin )
21		eqid 2188	. . . . . 6 |- { y e. ( 0..^ ( M / N ) ) | ( y gcd ( M / N ) ) = 1 } = { y e. ( 0..^ ( M / N ) ) | ( y gcd ( M / N ) ) = 1 }
22		eqid 2188	. . . . . 6 |- { x e. ( 0..^ M ) | ( x gcd M ) = N } = { x e. ( 0..^ M ) | ( x gcd M ) = N }
23		eqid 2188	. . . . . 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 12255	. . . . 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 1204	. . . 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 10786	. . 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 2222	. 2 |- ( ( ( M e. NN /\ N e. NN ) /\ N || M ) -> (♯ ` { x e. ( 0..^ M ) | ( x gcd M ) = N } ) = ( phi ` ( M / N ) ) )
28		simprr 531	. . . . . . . . . 10 |- ( ( ( M e. NN /\ N e. NN ) /\ ( x e. ( 0..^ M ) /\ ( x gcd M ) = N ) ) -> ( x gcd M ) = N )
29		elfzoelz 10164	. . . . . . . . . . . . 13 |- ( x e. ( 0..^ M ) -> x e. ZZ )
30	29	ad2antrl 490	. . . . . . . . . . . 12 |- ( ( ( M e. NN /\ N e. NN ) /\ ( x e. ( 0..^ M ) /\ ( x gcd M ) = N ) ) -> x e. ZZ )
31		nnz 9289	. . . . . . . . . . . . 13 |- ( M e. NN -> M e. ZZ )
32	31	ad2antrr 488	. . . . . . . . . . . 12 |- ( ( ( M e. NN /\ N e. NN ) /\ ( x e. ( 0..^ M ) /\ ( x gcd M ) = N ) ) -> M e. ZZ )
33		gcddvds 11981	. . . . . . . . . . . 12 |- ( ( x e. ZZ /\ M e. ZZ ) -> ( ( x gcd M ) || x /\ ( x gcd M ) || M ) )
34	30, 32, 33	syl2anc 411	. . . . . . . . . . 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 114	. . . . . . . . . 10 |- ( ( ( M e. NN /\ N e. NN ) /\ ( x e. ( 0..^ M ) /\ ( x gcd M ) = N ) ) -> ( x gcd M ) || M )
36	28, 35	eqbrtrrd 4041	. . . . . . . . 9 |- ( ( ( M e. NN /\ N e. NN ) /\ ( x e. ( 0..^ M ) /\ ( x gcd M ) = N ) ) -> N || M )
37	36	expr 375	. . . . . . . 8 |- ( ( ( M e. NN /\ N e. NN ) /\ x e. ( 0..^ M ) ) -> ( ( x gcd M ) = N -> N || M ) )
38	37	con3d 632	. . . . . . 7 |- ( ( ( M e. NN /\ N e. NN ) /\ x e. ( 0..^ M ) ) -> ( -. N || M -> -. ( x gcd M ) = N ) )
39	38	impancom 260	. . . . . 6 |- ( ( ( M e. NN /\ N e. NN ) /\ -. N || M ) -> ( x e. ( 0..^ M ) -> -. ( x gcd M ) = N ) )
40	39	ralrimiv 2561	. . . . 5 |- ( ( ( M e. NN /\ N e. NN ) /\ -. N || M ) -> A. x e. ( 0..^ M ) -. ( x gcd M ) = N )
41		rabeq0 3466	. . . . 5 |- ( { x e. ( 0..^ M ) | ( x gcd M ) = N } = (/) <-> A. x e. ( 0..^ M ) -. ( x gcd M ) = N )
42	40, 41	sylibr 134	. . . 4 |- ( ( ( M e. NN /\ N e. NN ) /\ -. N || M ) -> { x e. ( 0..^ M ) | ( x gcd M ) = N } = (/) )
43	42	fveq2d 5533	. . 3 |- ( ( ( M e. NN /\ N e. NN ) /\ -. N || M ) -> (♯ ` { x e. ( 0..^ M ) | ( x gcd M ) = N } ) = (♯ ` (/) ) )
44		hash0 10793	. . 3 |- (♯ ` (/) ) = 0
45	43, 44	eqtrdi 2237	. 2 |- ( ( ( M e. NN /\ N e. NN ) /\ -. N || M ) -> (♯ ` { x e. ( 0..^ M ) | ( x gcd M ) = N } ) = 0 )
46		dvdsdc 11822	. . . 4 |- ( ( N e. NN /\ M e. ZZ ) -> DECID N || M )
47	31, 46	sylan2 286	. . 3 |- ( ( N e. NN /\ M e. NN ) -> DECID N || M )
48	47	ancoms 268	. 2 |- ( ( M e. NN /\ N e. NN ) -> DECID N || M )
49	1, 2, 27, 45, 48	ifbothdadc 3580	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 104  DECID wdc 835   = wceq 1363   e. wcel 2159   A.wral 2467   {crab 2471   (/)c0 3436   ifcif 3548   class class class wbr 4017   |-> cmpt 4078   -1-1-onto->wf1o 5229   ` cfv 5230  (class class class)co 5890   Fincfn 6757   0cc0 7828   1c1 7829   x. cmul 7833   / cdiv 8646   NNcn 8936   ZZcz 9270  ..^cfzo 10159  ♯chash 10772   || cdvds 11811   gcd cgcd 11960   phicphi 12226

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 615  ax-in2 616  ax-io 710  ax-5 1457  ax-7 1458  ax-gen 1459  ax-ie1 1503  ax-ie2 1504  ax-8 1514  ax-10 1515  ax-11 1516  ax-i12 1517  ax-bndl 1519  ax-4 1520  ax-17 1536  ax-i9 1540  ax-ial 1544  ax-i5r 1545  ax-13 2161  ax-14 2162  ax-ext 2170  ax-coll 4132  ax-sep 4135  ax-nul 4143  ax-pow 4188  ax-pr 4223  ax-un 4447  ax-setind 4550  ax-iinf 4601  ax-cnex 7919  ax-resscn 7920  ax-1cn 7921  ax-1re 7922  ax-icn 7923  ax-addcl 7924  ax-addrcl 7925  ax-mulcl 7926  ax-mulrcl 7927  ax-addcom 7928  ax-mulcom 7929  ax-addass 7930  ax-mulass 7931  ax-distr 7932  ax-i2m1 7933  ax-0lt1 7934  ax-1rid 7935  ax-0id 7936  ax-rnegex 7937  ax-precex 7938  ax-cnre 7939  ax-pre-ltirr 7940  ax-pre-ltwlin 7941  ax-pre-lttrn 7942  ax-pre-apti 7943  ax-pre-ltadd 7944  ax-pre-mulgt0 7945  ax-pre-mulext 7946  ax-arch 7947  ax-caucvg 7948

This theorem depends on definitions:  df-bi 117  df-stab 832  df-dc 836  df-3or 980  df-3an 981  df-tru 1366  df-fal 1369  df-nf 1471  df-sb 1773  df-eu 2040  df-mo 2041  df-clab 2175  df-cleq 2181  df-clel 2184  df-nfc 2320  df-ne 2360  df-nel 2455  df-ral 2472  df-rex 2473  df-reu 2474  df-rmo 2475  df-rab 2476  df-v 2753  df-sbc 2977  df-csb 3072  df-dif 3145  df-un 3147  df-in 3149  df-ss 3156  df-nul 3437  df-if 3549  df-pw 3591  df-sn 3612  df-pr 3613  df-op 3615  df-uni 3824  df-int 3859  df-iun 3902  df-br 4018  df-opab 4079  df-mpt 4080  df-tr 4116  df-id 4307  df-po 4310  df-iso 4311  df-iord 4380  df-on 4382  df-ilim 4383  df-suc 4385  df-iom 4604  df-xp 4646  df-rel 4647  df-cnv 4648  df-co 4649  df-dm 4650  df-rn 4651  df-res 4652  df-ima 4653  df-iota 5192  df-fun 5232  df-fn 5233  df-f 5234  df-f1 5235  df-fo 5236  df-f1o 5237  df-fv 5238  df-riota 5846  df-ov 5893  df-oprab 5894  df-mpo 5895  df-1st 6158  df-2nd 6159  df-recs 6323  df-frec 6409  df-1o 6434  df-er 6552  df-en 6758  df-dom 6759  df-fin 6760  df-sup 7000  df-pnf 8011  df-mnf 8012  df-xr 8013  df-ltxr 8014  df-le 8015  df-sub 8147  df-neg 8148  df-reap 8549  df-ap 8556  df-div 8647  df-inn 8937  df-2 8995  df-3 8996  df-4 8997  df-n0 9194  df-z 9271  df-uz 9546  df-q 9637  df-rp 9671  df-fz 10026  df-fzo 10160  df-fl 10287  df-mod 10340  df-seqfrec 10463  df-exp 10537  df-ihash 10773  df-cj 10868  df-re 10869  df-im 10870  df-rsqrt 11024  df-abs 11025  df-dvds 11812  df-gcd 11961  df-phi 12228

This theorem is referenced by:  phisum  12257