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Theorem ballotfilemrinv 13336

Description: 𝑅 is its own inverse : it is an involution. (Contributed by Thierry Arnoux, 10-Apr-2017.)

**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)))))
ballotth.e	⊢ 𝐸 = {𝑐 ∈ 𝑂 ∣ ∀𝑖 ∈ (1...(𝑀 + 𝑁))0 < ((𝐹‘𝑐)‘𝑖)}
ballotth.mgtn	⊢ 𝑁 < 𝑀
ballotth.i	⊢ 𝐼 = (𝑐 ∈ (𝑂 ∖ 𝐸) ↦ inf({𝑘 ∈ (1...(𝑀 + 𝑁)) ∣ ((𝐹‘𝑐)‘𝑘) = 0}, ℝ, < ))
ballotth.s	⊢ 𝑆 = (𝑐 ∈ (𝑂 ∖ 𝐸) ↦ (𝑖 ∈ (1...(𝑀 + 𝑁)) ↦ if(𝑖 ≤ (𝐼‘𝑐), (((𝐼‘𝑐) + 1) − 𝑖), 𝑖)))
ballotth.r	⊢ 𝑅 = (𝑐 ∈ (𝑂 ∖ 𝐸) ↦ ((𝑆‘𝑐) “ 𝑐))

**Assertion**
Ref	Expression
ballotfilemrinv	⊢ ^◡𝑅 = 𝑅

Distinct variable groups: 𝑀,𝑐 𝑁,𝑐 𝑂,𝑐 𝑖,𝑀 𝑖,𝑁 𝑖,𝑂 𝑘,𝑀 𝑘,𝑁 𝑘,𝑂 𝑖,𝑐,𝐹,𝑘 𝑖,𝐸,𝑘 𝑘,𝐼,𝑐 𝐸,𝑐 𝑖,𝐼,𝑐 𝑆,𝑘,𝑖,𝑐 𝑅,𝑖,𝑘 𝑥,𝑐,𝐹 𝑥,𝑀 𝑥,𝑁,𝑖,𝑘 Allowed substitution hints: 𝑃(𝑥, 𝑖, 𝑘, 𝑐) 𝑅(𝑥, 𝑐) 𝑆(𝑥) 𝐸(𝑥) 𝐼(𝑥) 𝑂(𝑥)

Proof of Theorem ballotfilemrinv Dummy variable 𝑑 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		ballotth.m	. . . . . . . 8 ⊢ 𝑀 ∈ ℕ
2		ballotth.n	. . . . . . . 8 ⊢ 𝑁 ∈ ℕ
3		ballotfilem.o	. . . . . . . 8 ⊢ 𝑂 = {𝑐 ∈ (𝒫 (1...(𝑀 + 𝑁)) ∩ Fin) ∣ (♯‘𝑐) = 𝑀}
4		ballotfilem.p	. . . . . . . 8 ⊢ 𝑃 = (𝑥 ∈ (𝒫 𝑂 ∩ Fin) ↦ ((♯‘𝑥) / (♯‘𝑂)))
5		ballotth.f	. . . . . . . 8 ⊢ 𝐹 = (𝑐 ∈ 𝑂 ↦ (𝑖 ∈ ℤ ↦ ((♯‘((1...𝑖) ∩ 𝑐)) − (♯‘((1...𝑖) ∖ 𝑐)))))
6		ballotth.e	. . . . . . . 8 ⊢ 𝐸 = {𝑐 ∈ 𝑂 ∣ ∀𝑖 ∈ (1...(𝑀 + 𝑁))0 < ((𝐹‘𝑐)‘𝑖)}
7		ballotth.mgtn	. . . . . . . 8 ⊢ 𝑁 < 𝑀
8		ballotth.i	. . . . . . . 8 ⊢ 𝐼 = (𝑐 ∈ (𝑂 ∖ 𝐸) ↦ inf({𝑘 ∈ (1...(𝑀 + 𝑁)) ∣ ((𝐹‘𝑐)‘𝑘) = 0}, ℝ, < ))
9		ballotth.s	. . . . . . . 8 ⊢ 𝑆 = (𝑐 ∈ (𝑂 ∖ 𝐸) ↦ (𝑖 ∈ (1...(𝑀 + 𝑁)) ↦ if(𝑖 ≤ (𝐼‘𝑐), (((𝐼‘𝑐) + 1) − 𝑖), 𝑖)))
10		ballotth.r	. . . . . . . 8 ⊢ 𝑅 = (𝑐 ∈ (𝑂 ∖ 𝐸) ↦ ((𝑆‘𝑐) “ 𝑐))
11	1, 2, 3, 4, 5, 6, 7, 8, 9, 10	ballotfilemrinv0 13335	. . . . . . 7 ⊢ ((𝑐 ∈ (𝑂 ∖ 𝐸) ∧ 𝑑 = ((𝑆‘𝑐) “ 𝑐)) → (𝑑 ∈ (𝑂 ∖ 𝐸) ∧ 𝑐 = ((𝑆‘𝑑) “ 𝑑)))
12	1, 2, 3, 4, 5, 6, 7, 8, 9, 10	ballotfilemrinv0 13335	. . . . . . 7 ⊢ ((𝑑 ∈ (𝑂 ∖ 𝐸) ∧ 𝑐 = ((𝑆‘𝑑) “ 𝑑)) → (𝑐 ∈ (𝑂 ∖ 𝐸) ∧ 𝑑 = ((𝑆‘𝑐) “ 𝑐)))
13	11, 12	impbii 126	. . . . . 6 ⊢ ((𝑐 ∈ (𝑂 ∖ 𝐸) ∧ 𝑑 = ((𝑆‘𝑐) “ 𝑐)) ↔ (𝑑 ∈ (𝑂 ∖ 𝐸) ∧ 𝑐 = ((𝑆‘𝑑) “ 𝑑)))
14	13	a1i 9	. . . . 5 ⊢ (⊤ → ((𝑐 ∈ (𝑂 ∖ 𝐸) ∧ 𝑑 = ((𝑆‘𝑐) “ 𝑐)) ↔ (𝑑 ∈ (𝑂 ∖ 𝐸) ∧ 𝑐 = ((𝑆‘𝑑) “ 𝑑))))
15	14	mptcnv 5193	. . . 4 ⊢ (⊤ → ^◡(𝑐 ∈ (𝑂 ∖ 𝐸) ↦ ((𝑆‘𝑐) “ 𝑐)) = (𝑑 ∈ (𝑂 ∖ 𝐸) ↦ ((𝑆‘𝑑) “ 𝑑)))
16	15	mptru 1411	. . 3 ⊢ ^◡(𝑐 ∈ (𝑂 ∖ 𝐸) ↦ ((𝑆‘𝑐) “ 𝑐)) = (𝑑 ∈ (𝑂 ∖ 𝐸) ↦ ((𝑆‘𝑑) “ 𝑑))
17		fveq2 5698	. . . . 5 ⊢ (𝑑 = 𝑐 → (𝑆‘𝑑) = (𝑆‘𝑐))
18		id 19	. . . . 5 ⊢ (𝑑 = 𝑐 → 𝑑 = 𝑐)
19	17, 18	imaeq12d 5130	. . . 4 ⊢ (𝑑 = 𝑐 → ((𝑆‘𝑑) “ 𝑑) = ((𝑆‘𝑐) “ 𝑐))
20	19	cbvmptv 4229	. . 3 ⊢ (𝑑 ∈ (𝑂 ∖ 𝐸) ↦ ((𝑆‘𝑑) “ 𝑑)) = (𝑐 ∈ (𝑂 ∖ 𝐸) ↦ ((𝑆‘𝑐) “ 𝑐))
21	16, 20	eqtri 2259	. 2 ⊢ ^◡(𝑐 ∈ (𝑂 ∖ 𝐸) ↦ ((𝑆‘𝑐) “ 𝑐)) = (𝑐 ∈ (𝑂 ∖ 𝐸) ↦ ((𝑆‘𝑐) “ 𝑐))
22	10	cnveqi 4957	. 2 ⊢ ^◡𝑅 = ^◡(𝑐 ∈ (𝑂 ∖ 𝐸) ↦ ((𝑆‘𝑐) “ 𝑐))
23	21, 22, 10	3eqtr4i 2269	1 ⊢ ^◡𝑅 = 𝑅

Colors of variables: wff set class

This proof depends on syntax axioms: ∧ wa 104 ↔ wb 105 = wceq 1402 ⊤wtru 1403 ∈ wcel 2209 ∀wral 2528 {crab 2532 ∖ cdif 3217 ∩ cin 3219 ifcif 3638 𝒫 cpw 3688 class class class wbr 4131 ↦ cmpt 4193 ^◡ccnv 4775 “ cima 4779 ‘cfv 5380 (class class class)co 6088 Fincfn 7027 infcinf 7330 ℝcr 8185 0cc0 8186 1c1 8187 + caddc 8189 < clt 8367 ≤ cle 8368 − cmin 8505 / cdiv 9011 ℕcn 9314 ℤcz 9656 ...cfz 10429 ♯chash 11237

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 4248 ax-sep 4251 ax-nul 4261 ax-pow 4313 ax-pr 4348 ax-un 4580 ax-setind 4686 ax-iinf 4737 ax-cnex 8277 ax-resscn 8278 ax-1cn 8279 ax-1re 8280 ax-icn 8281 ax-addcl 8282 ax-addrcl 8283 ax-mulcl 8284 ax-mulrcl 8285 ax-addcom 8286 ax-mulcom 8287 ax-addass 8288 ax-mulass 8289 ax-distr 8290 ax-i2m1 8291 ax-0lt1 8292 ax-1rid 8293 ax-0id 8294 ax-rnegex 8295 ax-precex 8296 ax-cnre 8297 ax-pre-ltirr 8298 ax-pre-ltwlin 8299 ax-pre-lttrn 8300 ax-pre-apti 8301 ax-pre-ltadd 8302 ax-pre-mulgt0 8303 ax-pre-mulext 8304

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-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-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 4132 df-opab 4194 df-mpt 4195 df-tr 4232 df-id 4440 df-po 4443 df-iso 4444 df-iord 4513 df-on 4515 df-ilim 4516 df-suc 4518 df-iom 4740 df-xp 4782 df-rel 4783 df-cnv 4784 df-co 4785 df-dm 4786 df-rn 4787 df-res 4788 df-ima 4789 df-iota 5340 df-fun 5382 df-fn 5383 df-f 5384 df-f1 5385 df-fo 5386 df-f1o 5387 df-fv 5388 df-isom 5389 df-riota 6041 df-ov 6091 df-oprab 6092 df-mpo 6093 df-1st 6378 df-2nd 6379 df-recs 6580 df-irdg 6645 df-frec 6666 df-1o 6691 df-oadd 6695 df-er 6811 df-en 7028 df-dom 7029 df-fin 7030 df-sup 7331 df-inf 7332 df-pnf 8369 df-mnf 8370 df-xr 8371 df-ltxr 8372 df-le 8373 df-sub 8507 df-neg 8508 df-reap 8912 df-ap 8919 df-div 9012 df-inn 9315 df-2 9373 df-n0 9576 df-z 9657 df-uz 9939 df-q 10037 df-rp 10073 df-fz 10430 df-fzo 10568 df-ihash 11238

This theorem is used by: ballotfilem7 13338

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