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Theorem ballotfilemfmpn 13234

Description: (𝐹‘𝐶) finishes counting at (𝑀 − 𝑁). (Contributed by Thierry Arnoux, 25-Nov-2016.)

**Hypotheses**
Ref	Expression
ballotth.m	⊢ 𝑀 ∈ ℕ
ballotth.n	⊢ 𝑁 ∈ ℕ
ballotfilem.o	⊢ 𝑂 = {𝑐 ∈ (𝒫 (1...(𝑀 + 𝑁)) ∩ Fin) ∣ (♯‘𝑐) = 𝑀}
ballotfilem.p	⊢ 𝑃 = (𝑥 ∈ (𝒫 𝑂 ∩ Fin) ↦ ((♯‘𝑥) / (♯‘𝑂)))
ballotth.f	⊢ 𝐹 = (𝑐 ∈ 𝑂 ↦ (𝑖 ∈ ℤ ↦ ((♯‘((1...𝑖) ∩ 𝑐)) − (♯‘((1...𝑖) ∖ 𝑐)))))

**Assertion**
Ref	Expression
ballotfilemfmpn	⊢ (𝐶 ∈ 𝑂 → ((𝐹‘𝐶)‘(𝑀 + 𝑁)) = (𝑀 − 𝑁))

Distinct variable groups: 𝑀,𝑐 𝑁,𝑐 𝑂,𝑐 𝑖,𝑀 𝑖,𝑁 𝑖,𝑂,𝑐 𝐹,𝑐,𝑖 𝐶,𝑖 Allowed substitution hints: 𝐶(𝑥, 𝑐) 𝑃(𝑥, 𝑖, 𝑐) 𝐹(𝑥) 𝑀(𝑥) 𝑁(𝑥) 𝑂(𝑥)

Proof of Theorem ballotfilemfmpn Dummy variable 𝑏 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		ballotth.m	. . 3 ⊢ 𝑀 ∈ ℕ
2		ballotth.n	. . 3 ⊢ 𝑁 ∈ ℕ
3		ballotfilem.o	. . 3 ⊢ 𝑂 = {𝑐 ∈ (𝒫 (1...(𝑀 + 𝑁)) ∩ Fin) ∣ (♯‘𝑐) = 𝑀}
4		ballotfilem.p	. . 3 ⊢ 𝑃 = (𝑥 ∈ (𝒫 𝑂 ∩ Fin) ↦ ((♯‘𝑥) / (♯‘𝑂)))
5		ballotth.f	. . 3 ⊢ 𝐹 = (𝑐 ∈ 𝑂 ↦ (𝑖 ∈ ℤ ↦ ((♯‘((1...𝑖) ∩ 𝑐)) − (♯‘((1...𝑖) ∖ 𝑐)))))
6		id 19	. . 3 ⊢ (𝐶 ∈ 𝑂 → 𝐶 ∈ 𝑂)
7		nnaddcl 9324	. . . . . 6 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (𝑀 + 𝑁) ∈ ℕ)
8	1, 2, 7	mp2an 430	. . . . 5 ⊢ (𝑀 + 𝑁) ∈ ℕ
9	8	nnzi 9665	. . . 4 ⊢ (𝑀 + 𝑁) ∈ ℤ
10	9	a1i 9	. . 3 ⊢ (𝐶 ∈ 𝑂 → (𝑀 + 𝑁) ∈ ℤ)
11	1, 2, 3, 4, 5, 6, 10	ballotfilemfval 13229	. 2 ⊢ (𝐶 ∈ 𝑂 → ((𝐹‘𝐶)‘(𝑀 + 𝑁)) = ((♯‘((1...(𝑀 + 𝑁)) ∩ 𝐶)) − (♯‘((1...(𝑀 + 𝑁)) ∖ 𝐶))))
12	3	ssrab3 3334	. . . . . . . . 9 ⊢ 𝑂 ⊆ (𝒫 (1...(𝑀 + 𝑁)) ∩ Fin)
13	12	sseli 3244	. . . . . . . 8 ⊢ (𝐶 ∈ 𝑂 → 𝐶 ∈ (𝒫 (1...(𝑀 + 𝑁)) ∩ Fin))
14	13	elin1d 3418	. . . . . . 7 ⊢ (𝐶 ∈ 𝑂 → 𝐶 ∈ 𝒫 (1...(𝑀 + 𝑁)))
15	14	elpwid 3700	. . . . . 6 ⊢ (𝐶 ∈ 𝑂 → 𝐶 ⊆ (1...(𝑀 + 𝑁)))
16		sseqin2 3450	. . . . . 6 ⊢ (𝐶 ⊆ (1...(𝑀 + 𝑁)) ↔ ((1...(𝑀 + 𝑁)) ∩ 𝐶) = 𝐶)
17	15, 16	sylib 122	. . . . 5 ⊢ (𝐶 ∈ 𝑂 → ((1...(𝑀 + 𝑁)) ∩ 𝐶) = 𝐶)
18	17	fveq2d 5699	. . . 4 ⊢ (𝐶 ∈ 𝑂 → (♯‘((1...(𝑀 + 𝑁)) ∩ 𝐶)) = (♯‘𝐶))
19		rabssab 3337	. . . . . . 7 ⊢ {𝑐 ∈ (𝒫 (1...(𝑀 + 𝑁)) ∩ Fin) ∣ (♯‘𝑐) = 𝑀} ⊆ {𝑐 ∣ (♯‘𝑐) = 𝑀}
20	19	sseli 3244	. . . . . 6 ⊢ (𝐶 ∈ {𝑐 ∈ (𝒫 (1...(𝑀 + 𝑁)) ∩ Fin) ∣ (♯‘𝑐) = 𝑀} → 𝐶 ∈ {𝑐 ∣ (♯‘𝑐) = 𝑀})
21	20, 3	eleq2s 2333	. . . . 5 ⊢ (𝐶 ∈ 𝑂 → 𝐶 ∈ {𝑐 ∣ (♯‘𝑐) = 𝑀})
22		fveqeq2 5704	. . . . . 6 ⊢ (𝑏 = 𝐶 → ((♯‘𝑏) = 𝑀 ↔ (♯‘𝐶) = 𝑀))
23		fveqeq2 5704	. . . . . . 7 ⊢ (𝑐 = 𝑏 → ((♯‘𝑐) = 𝑀 ↔ (♯‘𝑏) = 𝑀))
24	23	cbvabv 2365	. . . . . 6 ⊢ {𝑐 ∣ (♯‘𝑐) = 𝑀} = {𝑏 ∣ (♯‘𝑏) = 𝑀}
25	22, 24	elab2g 2973	. . . . 5 ⊢ (𝐶 ∈ 𝑂 → (𝐶 ∈ {𝑐 ∣ (♯‘𝑐) = 𝑀} ↔ (♯‘𝐶) = 𝑀))
26	21, 25	mpbid 147	. . . 4 ⊢ (𝐶 ∈ 𝑂 → (♯‘𝐶) = 𝑀)
27	18, 26	eqtrd 2271	. . 3 ⊢ (𝐶 ∈ 𝑂 → (♯‘((1...(𝑀 + 𝑁)) ∩ 𝐶)) = 𝑀)
28		1z 9670	. . . . . 6 ⊢ 1 ∈ ℤ
29		fzfig 10867	. . . . . 6 ⊢ ((1 ∈ ℤ ∧ (𝑀 + 𝑁) ∈ ℤ) → (1...(𝑀 + 𝑁)) ∈ Fin)
30	28, 9, 29	mp2an 430	. . . . 5 ⊢ (1...(𝑀 + 𝑁)) ∈ Fin
31	13	elin2d 3419	. . . . 5 ⊢ (𝐶 ∈ 𝑂 → 𝐶 ∈ Fin)
32		fihashssdif 11259	. . . . 5 ⊢ (((1...(𝑀 + 𝑁)) ∈ Fin ∧ 𝐶 ∈ Fin ∧ 𝐶 ⊆ (1...(𝑀 + 𝑁))) → (♯‘((1...(𝑀 + 𝑁)) ∖ 𝐶)) = ((♯‘(1...(𝑀 + 𝑁))) − (♯‘𝐶)))
33	30, 31, 15, 32	mp3an2i 1383	. . . 4 ⊢ (𝐶 ∈ 𝑂 → (♯‘((1...(𝑀 + 𝑁)) ∖ 𝐶)) = ((♯‘(1...(𝑀 + 𝑁))) − (♯‘𝐶)))
34	8	nnnn0i 9571	. . . . . 6 ⊢ (𝑀 + 𝑁) ∈ ℕ₀
35		hashfz1 11222	. . . . . 6 ⊢ ((𝑀 + 𝑁) ∈ ℕ₀ → (♯‘(1...(𝑀 + 𝑁))) = (𝑀 + 𝑁))
36	34, 35	mp1i 10	. . . . 5 ⊢ (𝐶 ∈ 𝑂 → (♯‘(1...(𝑀 + 𝑁))) = (𝑀 + 𝑁))
37	36, 26	oveq12d 6103	. . . 4 ⊢ (𝐶 ∈ 𝑂 → ((♯‘(1...(𝑀 + 𝑁))) − (♯‘𝐶)) = ((𝑀 + 𝑁) − 𝑀))
38	1	nncni 9314	. . . . . 6 ⊢ 𝑀 ∈ ℂ
39	2	nncni 9314	. . . . . 6 ⊢ 𝑁 ∈ ℂ
40		pncan2 8533	. . . . . 6 ⊢ ((𝑀 ∈ ℂ ∧ 𝑁 ∈ ℂ) → ((𝑀 + 𝑁) − 𝑀) = 𝑁)
41	38, 39, 40	mp2an 430	. . . . 5 ⊢ ((𝑀 + 𝑁) − 𝑀) = 𝑁
42	41	a1i 9	. . . 4 ⊢ (𝐶 ∈ 𝑂 → ((𝑀 + 𝑁) − 𝑀) = 𝑁)
43	33, 37, 42	3eqtrd 2275	. . 3 ⊢ (𝐶 ∈ 𝑂 → (♯‘((1...(𝑀 + 𝑁)) ∖ 𝐶)) = 𝑁)
44	27, 43	oveq12d 6103	. 2 ⊢ (𝐶 ∈ 𝑂 → ((♯‘((1...(𝑀 + 𝑁)) ∩ 𝐶)) − (♯‘((1...(𝑀 + 𝑁)) ∖ 𝐶))) = (𝑀 − 𝑁))
45	11, 44	eqtrd 2271	1 ⊢ (𝐶 ∈ 𝑂 → ((𝐹‘𝐶)‘(𝑀 + 𝑁)) = (𝑀 − 𝑁))

Colors of variables: wff set class

This proof depends on syntax axioms: → wi 4 = wceq 1402 ∈ wcel 2209 {cab 2224 {crab 2532 ∖ cdif 3217 ∩ cin 3219 ⊆ wss 3220 𝒫 cpw 3688 ↦ cmpt 4192 ‘cfv 5377 (class class class)co 6085 Fincfn 7022 ℂcc 8177 1c1 8180 + caddc 8182 − cmin 8497 / cdiv 9002 ℕcn 9304 ℕ₀cn0 9563 ℤcz 9644 ...cfz 10411 ♯chash 11214

This proof depends on 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-coll 4246 ax-sep 4249 ax-nul 4259 ax-pow 4311 ax-pr 4346 ax-un 4578 ax-setind 4684 ax-iinf 4735 ax-cnex 8270 ax-resscn 8271 ax-1cn 8272 ax-1re 8273 ax-icn 8274 ax-addcl 8275 ax-addrcl 8276 ax-mulcl 8277 ax-addcom 8279 ax-addass 8281 ax-distr 8283 ax-i2m1 8284 ax-0lt1 8285 ax-0id 8287 ax-rnegex 8288 ax-cnre 8290 ax-pre-ltirr 8291 ax-pre-ltwlin 8292 ax-pre-lttrn 8293 ax-pre-apti 8294 ax-pre-ltadd 8295

This proof depends on definitions: df-bi 117 df-dc 847 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-rab 2537 df-v 2823 df-sbc 3052 df-csb 3148 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-nul 3521 df-if 3639 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-int 3971 df-iun 4014 df-br 4131 df-opab 4193 df-mpt 4194 df-tr 4230 df-id 4438 df-iord 4511 df-on 4513 df-ilim 4514 df-suc 4516 df-iom 4738 df-xp 4780 df-rel 4781 df-cnv 4782 df-co 4783 df-dm 4784 df-rn 4785 df-res 4786 df-ima 4787 df-iota 5337 df-fun 5379 df-fn 5380 df-f 5381 df-f1 5382 df-fo 5383 df-f1o 5384 df-fv 5385 df-riota 6038 df-ov 6088 df-oprab 6089 df-mpo 6090 df-1st 6374 df-2nd 6375 df-recs 6576 df-irdg 6641 df-frec 6662 df-1o 6687 df-oadd 6691 df-er 6807 df-en 7023 df-dom 7024 df-fin 7025 df-pnf 8362 df-mnf 8363 df-xr 8364 df-ltxr 8365 df-le 8366 df-sub 8499 df-neg 8500 df-inn 9305 df-n0 9564 df-z 9645 df-uz 9922 df-fz 10412 df-ihash 11215

This theorem is used by: ballotfilem5 13242

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