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Theorem fincygsubgodd 19984

Description: Calculate the order of a subgroup of a finite cyclic group. (Contributed by Rohan Ridenour, 3-Aug-2023.)

**Hypotheses**
Ref	Expression
fincygsubgodd.1	⊢ 𝐵 = (Base‘𝐺)
fincygsubgodd.2	⊢ · = (._g‘𝐺)
fincygsubgodd.3	⊢ 𝐷 = ((♯‘𝐵) / 𝐶)
fincygsubgodd.4	⊢ 𝐹 = (𝑛 ∈ ℤ ↦ (𝑛 · 𝐴))
fincygsubgodd.5	⊢ 𝐻 = (𝑛 ∈ ℤ ↦ (𝑛 · (𝐶 · 𝐴)))
fincygsubgodd.6	⊢ (𝜑 → 𝐺 ∈ Grp)
fincygsubgodd.7	⊢ (𝜑 → 𝐴 ∈ 𝐵)
fincygsubgodd.8	⊢ (𝜑 → ran 𝐹 = 𝐵)
fincygsubgodd.9	⊢ (𝜑 → 𝐶 ∥ (♯‘𝐵))
fincygsubgodd.10	⊢ (𝜑 → 𝐵 ∈ Fin)
fincygsubgodd.11	⊢ (𝜑 → 𝐶 ∈ ℕ)

**Assertion**
Ref	Expression
fincygsubgodd	⊢ (𝜑 → (♯‘ran 𝐻) = 𝐷)

Distinct variable groups: · ,𝑛 𝐴,𝑛 𝐵,𝑛 𝐶,𝑛 𝑛,𝐺 Allowed substitution hints: 𝜑(𝑛) 𝐷(𝑛) 𝐹(𝑛) 𝐻(𝑛)

**Proof of Theorem fincygsubgodd**
Step	Hyp	Ref	Expression
1		fincygsubgodd.3	. . 3 ⊢ 𝐷 = ((♯‘𝐵) / 𝐶)
2		fincygsubgodd.1	. . . . . . 7 ⊢ 𝐵 = (Base‘𝐺)
3		fincygsubgodd.2	. . . . . . 7 ⊢ · = (._g‘𝐺)
4		eqid 2732	. . . . . . 7 ⊢ (od‘𝐺) = (od‘𝐺)
5		fincygsubgodd.6	. . . . . . 7 ⊢ (𝜑 → 𝐺 ∈ Grp)
6		fincygsubgodd.7	. . . . . . 7 ⊢ (𝜑 → 𝐴 ∈ 𝐵)
7		fincygsubgodd.8	. . . . . . . 8 ⊢ (𝜑 → ran 𝐹 = 𝐵)
8		fincygsubgodd.4	. . . . . . . . 9 ⊢ 𝐹 = (𝑛 ∈ ℤ ↦ (𝑛 · 𝐴))
9	8	rneqi 5936	. . . . . . . 8 ⊢ ran 𝐹 = ran (𝑛 ∈ ℤ ↦ (𝑛 · 𝐴))
10	7, 9	eqtr3di 2787	. . . . . . 7 ⊢ (𝜑 → 𝐵 = ran (𝑛 ∈ ℤ ↦ (𝑛 · 𝐴)))
11	2, 3, 4, 5, 6, 10	cycsubggenodd 19981	. . . . . 6 ⊢ (𝜑 → ((od‘𝐺)‘𝐴) = if(𝐵 ∈ Fin, (♯‘𝐵), 0))
12		fincygsubgodd.10	. . . . . . 7 ⊢ (𝜑 → 𝐵 ∈ Fin)
13	12	iftrued 4536	. . . . . 6 ⊢ (𝜑 → if(𝐵 ∈ Fin, (♯‘𝐵), 0) = (♯‘𝐵))
14	11, 13	eqtrd 2772	. . . . 5 ⊢ (𝜑 → ((od‘𝐺)‘𝐴) = (♯‘𝐵))
15	14	oveq1d 7426	. . . 4 ⊢ (𝜑 → (((od‘𝐺)‘𝐴) / 𝐶) = ((♯‘𝐵) / 𝐶))
16		fincygsubgodd.11	. . . . . . . 8 ⊢ (𝜑 → 𝐶 ∈ ℕ)
17	16	nnzd 12587	. . . . . . 7 ⊢ (𝜑 → 𝐶 ∈ ℤ)
18	2, 4, 3	odmulg 19426	. . . . . . 7 ⊢ ((𝐺 ∈ Grp ∧ 𝐴 ∈ 𝐵 ∧ 𝐶 ∈ ℤ) → ((od‘𝐺)‘𝐴) = ((𝐶 gcd ((od‘𝐺)‘𝐴)) · ((od‘𝐺)‘(𝐶 · 𝐴))))
19	5, 6, 17, 18	syl3anc 1371	. . . . . 6 ⊢ (𝜑 → ((od‘𝐺)‘𝐴) = ((𝐶 gcd ((od‘𝐺)‘𝐴)) · ((od‘𝐺)‘(𝐶 · 𝐴))))
20	2, 4	odcl 19406	. . . . . . . . 9 ⊢ (𝐴 ∈ 𝐵 → ((od‘𝐺)‘𝐴) ∈ ℕ₀)
21		nn0z 12585	. . . . . . . . 9 ⊢ (((od‘𝐺)‘𝐴) ∈ ℕ₀ → ((od‘𝐺)‘𝐴) ∈ ℤ)
22	6, 20, 21	3syl 18	. . . . . . . 8 ⊢ (𝜑 → ((od‘𝐺)‘𝐴) ∈ ℤ)
23		fincygsubgodd.9	. . . . . . . . 9 ⊢ (𝜑 → 𝐶 ∥ (♯‘𝐵))
24	23, 14	breqtrrd 5176	. . . . . . . 8 ⊢ (𝜑 → 𝐶 ∥ ((od‘𝐺)‘𝐴))
25	16, 22, 24	dvdsgcdidd 16481	. . . . . . 7 ⊢ (𝜑 → (𝐶 gcd ((od‘𝐺)‘𝐴)) = 𝐶)
26	25	oveq1d 7426	. . . . . 6 ⊢ (𝜑 → ((𝐶 gcd ((od‘𝐺)‘𝐴)) · ((od‘𝐺)‘(𝐶 · 𝐴))) = (𝐶 · ((od‘𝐺)‘(𝐶 · 𝐴))))
27	19, 26	eqtrd 2772	. . . . 5 ⊢ (𝜑 → ((od‘𝐺)‘𝐴) = (𝐶 · ((od‘𝐺)‘(𝐶 · 𝐴))))
28	2, 4, 6	odcld 19422	. . . . . . 7 ⊢ (𝜑 → ((od‘𝐺)‘𝐴) ∈ ℕ₀)
29	28	nn0cnd 12536	. . . . . 6 ⊢ (𝜑 → ((od‘𝐺)‘𝐴) ∈ ℂ)
30	2, 3, 5, 17, 6	mulgcld 18978	. . . . . . . 8 ⊢ (𝜑 → (𝐶 · 𝐴) ∈ 𝐵)
31	2, 4, 30	odcld 19422	. . . . . . 7 ⊢ (𝜑 → ((od‘𝐺)‘(𝐶 · 𝐴)) ∈ ℕ₀)
32	31	nn0cnd 12536	. . . . . 6 ⊢ (𝜑 → ((od‘𝐺)‘(𝐶 · 𝐴)) ∈ ℂ)
33	17	zcnd 12669	. . . . . 6 ⊢ (𝜑 → 𝐶 ∈ ℂ)
34	16	nnne0d 12264	. . . . . 6 ⊢ (𝜑 → 𝐶 ≠ 0)
35	29, 32, 33, 34	divmul2d 12025	. . . . 5 ⊢ (𝜑 → ((((od‘𝐺)‘𝐴) / 𝐶) = ((od‘𝐺)‘(𝐶 · 𝐴)) ↔ ((od‘𝐺)‘𝐴) = (𝐶 · ((od‘𝐺)‘(𝐶 · 𝐴)))))
36	27, 35	mpbird 256	. . . 4 ⊢ (𝜑 → (((od‘𝐺)‘𝐴) / 𝐶) = ((od‘𝐺)‘(𝐶 · 𝐴)))
37	15, 36	eqtr3d 2774	. . 3 ⊢ (𝜑 → ((♯‘𝐵) / 𝐶) = ((od‘𝐺)‘(𝐶 · 𝐴)))
38	1, 37	eqtrid 2784	. 2 ⊢ (𝜑 → 𝐷 = ((od‘𝐺)‘(𝐶 · 𝐴)))
39		fincygsubgodd.5	. . . . 5 ⊢ 𝐻 = (𝑛 ∈ ℤ ↦ (𝑛 · (𝐶 · 𝐴)))
40	39	rneqi 5936	. . . 4 ⊢ ran 𝐻 = ran (𝑛 ∈ ℤ ↦ (𝑛 · (𝐶 · 𝐴)))
41	40	a1i 11	. . 3 ⊢ (𝜑 → ran 𝐻 = ran (𝑛 ∈ ℤ ↦ (𝑛 · (𝐶 · 𝐴))))
42	2, 3, 4, 5, 30, 41	cycsubggenodd 19981	. 2 ⊢ (𝜑 → ((od‘𝐺)‘(𝐶 · 𝐴)) = if(ran 𝐻 ∈ Fin, (♯‘ran 𝐻), 0))
43	38, 42	eqtrd 2772	. . . . 5 ⊢ (𝜑 → 𝐷 = if(ran 𝐻 ∈ Fin, (♯‘ran 𝐻), 0))
44		iffalse 4537	. . . . 5 ⊢ (¬ ran 𝐻 ∈ Fin → if(ran 𝐻 ∈ Fin, (♯‘ran 𝐻), 0) = 0)
45	43, 44	sylan9eq 2792	. . . 4 ⊢ ((𝜑 ∧ ¬ ran 𝐻 ∈ Fin) → 𝐷 = 0)
46	1	a1i 11	. . . . . . 7 ⊢ (𝜑 → 𝐷 = ((♯‘𝐵) / 𝐶))
47		hashcl 14318	. . . . . . . . 9 ⊢ (𝐵 ∈ Fin → (♯‘𝐵) ∈ ℕ₀)
48		nn0cn 12484	. . . . . . . . 9 ⊢ ((♯‘𝐵) ∈ ℕ₀ → (♯‘𝐵) ∈ ℂ)
49	12, 47, 48	3syl 18	. . . . . . . 8 ⊢ (𝜑 → (♯‘𝐵) ∈ ℂ)
50	6, 12	hashelne0d 14330	. . . . . . . . 9 ⊢ (𝜑 → ¬ (♯‘𝐵) = 0)
51	50	neqned 2947	. . . . . . . 8 ⊢ (𝜑 → (♯‘𝐵) ≠ 0)
52	49, 33, 51, 34	divne0d 12008	. . . . . . 7 ⊢ (𝜑 → ((♯‘𝐵) / 𝐶) ≠ 0)
53	46, 52	eqnetrd 3008	. . . . . 6 ⊢ (𝜑 → 𝐷 ≠ 0)
54	53	neneqd 2945	. . . . 5 ⊢ (𝜑 → ¬ 𝐷 = 0)
55	54	adantr 481	. . . 4 ⊢ ((𝜑 ∧ ¬ ran 𝐻 ∈ Fin) → ¬ 𝐷 = 0)
56	45, 55	condan 816	. . 3 ⊢ (𝜑 → ran 𝐻 ∈ Fin)
57	56	iftrued 4536	. 2 ⊢ (𝜑 → if(ran 𝐻 ∈ Fin, (♯‘ran 𝐻), 0) = (♯‘ran 𝐻))
58	38, 42, 57	3eqtrrd 2777	1 ⊢ (𝜑 → (♯‘ran 𝐻) = 𝐷)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 = wceq 1541 ∈ wcel 2106 ifcif 4528 class class class wbr 5148 ↦ cmpt 5231 ran crn 5677 ‘cfv 6543 (class class class)co 7411 Fincfn 8941 ℂcc 11110 0cc0 11112 · cmul 11117 / cdiv 11873 ℕcn 12214 ℕ₀cn0 12474 ℤcz 12560 ♯chash 14292 ∥ cdvds 16199 gcd cgcd 16437 Basecbs 17146 Grpcgrp 18821 ._gcmg 18952 odcod 19394

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7727 ax-inf2 9638 ax-cnex 11168 ax-resscn 11169 ax-1cn 11170 ax-icn 11171 ax-addcl 11172 ax-addrcl 11173 ax-mulcl 11174 ax-mulrcl 11175 ax-mulcom 11176 ax-addass 11177 ax-mulass 11178 ax-distr 11179 ax-i2m1 11180 ax-1ne0 11181 ax-1rid 11182 ax-rnegex 11183 ax-rrecex 11184 ax-cnre 11185 ax-pre-lttri 11186 ax-pre-lttrn 11187 ax-pre-ltadd 11188 ax-pre-mulgt0 11189 ax-pre-sup 11190

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-pss 3967 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-op 4635 df-uni 4909 df-int 4951 df-iun 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5574 df-eprel 5580 df-po 5588 df-so 5589 df-fr 5631 df-se 5632 df-we 5633 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-isom 6552 df-riota 7367 df-ov 7414 df-oprab 7415 df-mpo 7416 df-om 7858 df-1st 7977 df-2nd 7978 df-frecs 8268 df-wrecs 8299 df-recs 8373 df-rdg 8412 df-1o 8468 df-oadd 8472 df-omul 8473 df-er 8705 df-map 8824 df-en 8942 df-dom 8943 df-sdom 8944 df-fin 8945 df-sup 9439 df-inf 9440 df-oi 9507 df-card 9936 df-acn 9939 df-pnf 11252 df-mnf 11253 df-xr 11254 df-ltxr 11255 df-le 11256 df-sub 11448 df-neg 11449 df-div 11874 df-nn 12215 df-2 12277 df-3 12278 df-n0 12475 df-z 12561 df-uz 12825 df-rp 12977 df-fz 13487 df-fl 13759 df-mod 13837 df-seq 13969 df-exp 14030 df-hash 14293 df-cj 15048 df-re 15049 df-im 15050 df-sqrt 15184 df-abs 15185 df-dvds 16200 df-gcd 16438 df-0g 17389 df-mgm 18563 df-sgrp 18612 df-mnd 18628 df-grp 18824 df-minusg 18825 df-sbg 18826 df-mulg 18953 df-od 19398

This theorem is referenced by: fincygsubgodexd 19985

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