subfacp1lem1 - Mathbox for Mario Carneiro

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Theorem subfacp1lem1 34784

Description: Lemma for subfacp1 34791. The set 𝐾 together with {1, 𝑀} partitions the set 1...(𝑁 + 1). (Contributed by Mario Carneiro, 23-Jan-2015.)

**Hypotheses**
Ref	Expression
derang.d	⊢ 𝐷 = (𝑥 ∈ Fin ↦ (♯‘{𝑓 ∣ (𝑓:𝑥–1-1-onto→𝑥 ∧ ∀𝑦 ∈ 𝑥 (𝑓‘𝑦) ≠ 𝑦)}))
subfac.n	⊢ 𝑆 = (𝑛 ∈ ℕ₀ ↦ (𝐷‘(1...𝑛)))
subfacp1lem.a	⊢ 𝐴 = {𝑓 ∣ (𝑓:(1...(𝑁 + 1))–1-1-onto→(1...(𝑁 + 1)) ∧ ∀𝑦 ∈ (1...(𝑁 + 1))(𝑓‘𝑦) ≠ 𝑦)}
subfacp1lem1.n	⊢ (𝜑 → 𝑁 ∈ ℕ)
subfacp1lem1.m	⊢ (𝜑 → 𝑀 ∈ (2...(𝑁 + 1)))
subfacp1lem1.x	⊢ 𝑀 ∈ V
subfacp1lem1.k	⊢ 𝐾 = ((2...(𝑁 + 1)) ∖ {𝑀})

**Assertion**
Ref	Expression
subfacp1lem1	⊢ (𝜑 → ((𝐾 ∩ {1, 𝑀}) = ∅ ∧ (𝐾 ∪ {1, 𝑀}) = (1...(𝑁 + 1)) ∧ (♯‘𝐾) = (𝑁 − 1)))

Distinct variable groups: 𝑓,𝑛,𝑥,𝑦,𝐴 𝑓,𝑁,𝑛,𝑥,𝑦 𝜑,𝑥,𝑦 𝐷,𝑛 𝑓,𝐾,𝑛,𝑥,𝑦 𝑓,𝑀,𝑥,𝑦 𝑆,𝑛,𝑥,𝑦 Allowed substitution hints: 𝜑(𝑓,𝑛) 𝐷(𝑥,𝑦,𝑓) 𝑆(𝑓) 𝑀(𝑛)

**Proof of Theorem subfacp1lem1**
Step	Hyp	Ref	Expression
1		disj 4444	. . . 4 ⊢ ((𝐾 ∩ {1, 𝑀}) = ∅ ↔ ∀𝑥 ∈ 𝐾 ¬ 𝑥 ∈ {1, 𝑀})
2		eldifi 4123	. . . . . . . . 9 ⊢ (𝑥 ∈ ((2...(𝑁 + 1)) ∖ {𝑀}) → 𝑥 ∈ (2...(𝑁 + 1)))
3		elfzle1 13531	. . . . . . . . 9 ⊢ (𝑥 ∈ (2...(𝑁 + 1)) → 2 ≤ 𝑥)
4		1lt2 12408	. . . . . . . . . . . 12 ⊢ 1 < 2
5		1re 11239	. . . . . . . . . . . . 13 ⊢ 1 ∈ ℝ
6		2re 12311	. . . . . . . . . . . . 13 ⊢ 2 ∈ ℝ
7	5, 6	ltnlei 11360	. . . . . . . . . . . 12 ⊢ (1 < 2 ↔ ¬ 2 ≤ 1)
8	4, 7	mpbi 229	. . . . . . . . . . 11 ⊢ ¬ 2 ≤ 1
9		breq2 5147	. . . . . . . . . . 11 ⊢ (𝑥 = 1 → (2 ≤ 𝑥 ↔ 2 ≤ 1))
10	8, 9	mtbiri 327	. . . . . . . . . 10 ⊢ (𝑥 = 1 → ¬ 2 ≤ 𝑥)
11	10	necon2ai 2966	. . . . . . . . 9 ⊢ (2 ≤ 𝑥 → 𝑥 ≠ 1)
12	2, 3, 11	3syl 18	. . . . . . . 8 ⊢ (𝑥 ∈ ((2...(𝑁 + 1)) ∖ {𝑀}) → 𝑥 ≠ 1)
13		eldifsni 4790	. . . . . . . 8 ⊢ (𝑥 ∈ ((2...(𝑁 + 1)) ∖ {𝑀}) → 𝑥 ≠ 𝑀)
14	12, 13	jca 511	. . . . . . 7 ⊢ (𝑥 ∈ ((2...(𝑁 + 1)) ∖ {𝑀}) → (𝑥 ≠ 1 ∧ 𝑥 ≠ 𝑀))
15		subfacp1lem1.k	. . . . . . 7 ⊢ 𝐾 = ((2...(𝑁 + 1)) ∖ {𝑀})
16	14, 15	eleq2s 2847	. . . . . 6 ⊢ (𝑥 ∈ 𝐾 → (𝑥 ≠ 1 ∧ 𝑥 ≠ 𝑀))
17		neanior 3031	. . . . . 6 ⊢ ((𝑥 ≠ 1 ∧ 𝑥 ≠ 𝑀) ↔ ¬ (𝑥 = 1 ∨ 𝑥 = 𝑀))
18	16, 17	sylib 217	. . . . 5 ⊢ (𝑥 ∈ 𝐾 → ¬ (𝑥 = 1 ∨ 𝑥 = 𝑀))
19		vex 3474	. . . . . 6 ⊢ 𝑥 ∈ V
20	19	elpr 4648	. . . . 5 ⊢ (𝑥 ∈ {1, 𝑀} ↔ (𝑥 = 1 ∨ 𝑥 = 𝑀))
21	18, 20	sylnibr 329	. . . 4 ⊢ (𝑥 ∈ 𝐾 → ¬ 𝑥 ∈ {1, 𝑀})
22	1, 21	mprgbir 3064	. . 3 ⊢ (𝐾 ∩ {1, 𝑀}) = ∅
23	22	a1i 11	. 2 ⊢ (𝜑 → (𝐾 ∩ {1, 𝑀}) = ∅)
24		uncom 4150	. . . 4 ⊢ ({1} ∪ (𝐾 ∪ {𝑀})) = ((𝐾 ∪ {𝑀}) ∪ {1})
25		1z 12617	. . . . . 6 ⊢ 1 ∈ ℤ
26		fzsn 13570	. . . . . 6 ⊢ (1 ∈ ℤ → (1...1) = {1})
27	25, 26	ax-mp 5	. . . . 5 ⊢ (1...1) = {1}
28	15	uneq1i 4156	. . . . . 6 ⊢ (𝐾 ∪ {𝑀}) = (((2...(𝑁 + 1)) ∖ {𝑀}) ∪ {𝑀})
29		undif1 4472	. . . . . 6 ⊢ (((2...(𝑁 + 1)) ∖ {𝑀}) ∪ {𝑀}) = ((2...(𝑁 + 1)) ∪ {𝑀})
30	28, 29	eqtr2i 2757	. . . . 5 ⊢ ((2...(𝑁 + 1)) ∪ {𝑀}) = (𝐾 ∪ {𝑀})
31	27, 30	uneq12i 4158	. . . 4 ⊢ ((1...1) ∪ ((2...(𝑁 + 1)) ∪ {𝑀})) = ({1} ∪ (𝐾 ∪ {𝑀}))
32		df-pr 4628	. . . . . . 7 ⊢ {1, 𝑀} = ({1} ∪ {𝑀})
33	32	equncomi 4152	. . . . . 6 ⊢ {1, 𝑀} = ({𝑀} ∪ {1})
34	33	uneq2i 4157	. . . . 5 ⊢ (𝐾 ∪ {1, 𝑀}) = (𝐾 ∪ ({𝑀} ∪ {1}))
35		unass 4163	. . . . 5 ⊢ ((𝐾 ∪ {𝑀}) ∪ {1}) = (𝐾 ∪ ({𝑀} ∪ {1}))
36	34, 35	eqtr4i 2759	. . . 4 ⊢ (𝐾 ∪ {1, 𝑀}) = ((𝐾 ∪ {𝑀}) ∪ {1})
37	24, 31, 36	3eqtr4i 2766	. . 3 ⊢ ((1...1) ∪ ((2...(𝑁 + 1)) ∪ {𝑀})) = (𝐾 ∪ {1, 𝑀})
38		subfacp1lem1.m	. . . . . . . 8 ⊢ (𝜑 → 𝑀 ∈ (2...(𝑁 + 1)))
39	38	snssd 4809	. . . . . . 7 ⊢ (𝜑 → {𝑀} ⊆ (2...(𝑁 + 1)))
40		ssequn2 4180	. . . . . . 7 ⊢ ({𝑀} ⊆ (2...(𝑁 + 1)) ↔ ((2...(𝑁 + 1)) ∪ {𝑀}) = (2...(𝑁 + 1)))
41	39, 40	sylib 217	. . . . . 6 ⊢ (𝜑 → ((2...(𝑁 + 1)) ∪ {𝑀}) = (2...(𝑁 + 1)))
42		df-2 12300	. . . . . . 7 ⊢ 2 = (1 + 1)
43	42	oveq1i 7425	. . . . . 6 ⊢ (2...(𝑁 + 1)) = ((1 + 1)...(𝑁 + 1))
44	41, 43	eqtrdi 2784	. . . . 5 ⊢ (𝜑 → ((2...(𝑁 + 1)) ∪ {𝑀}) = ((1 + 1)...(𝑁 + 1)))
45	44	uneq2d 4160	. . . 4 ⊢ (𝜑 → ((1...1) ∪ ((2...(𝑁 + 1)) ∪ {𝑀})) = ((1...1) ∪ ((1 + 1)...(𝑁 + 1))))
46		subfacp1lem1.n	. . . . . . 7 ⊢ (𝜑 → 𝑁 ∈ ℕ)
47	46	peano2nnd 12254	. . . . . 6 ⊢ (𝜑 → (𝑁 + 1) ∈ ℕ)
48		nnuz 12890	. . . . . 6 ⊢ ℕ = (ℤ_≥‘1)
49	47, 48	eleqtrdi 2839	. . . . 5 ⊢ (𝜑 → (𝑁 + 1) ∈ (ℤ_≥‘1))
50		eluzfz1 13535	. . . . 5 ⊢ ((𝑁 + 1) ∈ (ℤ_≥‘1) → 1 ∈ (1...(𝑁 + 1)))
51		fzsplit 13554	. . . . 5 ⊢ (1 ∈ (1...(𝑁 + 1)) → (1...(𝑁 + 1)) = ((1...1) ∪ ((1 + 1)...(𝑁 + 1))))
52	49, 50, 51	3syl 18	. . . 4 ⊢ (𝜑 → (1...(𝑁 + 1)) = ((1...1) ∪ ((1 + 1)...(𝑁 + 1))))
53	45, 52	eqtr4d 2771	. . 3 ⊢ (𝜑 → ((1...1) ∪ ((2...(𝑁 + 1)) ∪ {𝑀})) = (1...(𝑁 + 1)))
54	37, 53	eqtr3id 2782	. 2 ⊢ (𝜑 → (𝐾 ∪ {1, 𝑀}) = (1...(𝑁 + 1)))
55	42	oveq2i 7426	. . 3 ⊢ ((𝑁 + 1) − 2) = ((𝑁 + 1) − (1 + 1))
56		fzfi 13964	. . . . . . . . 9 ⊢ (2...(𝑁 + 1)) ∈ Fin
57		diffi 9198	. . . . . . . . 9 ⊢ ((2...(𝑁 + 1)) ∈ Fin → ((2...(𝑁 + 1)) ∖ {𝑀}) ∈ Fin)
58	56, 57	ax-mp 5	. . . . . . . 8 ⊢ ((2...(𝑁 + 1)) ∖ {𝑀}) ∈ Fin
59	15, 58	eqeltri 2825	. . . . . . 7 ⊢ 𝐾 ∈ Fin
60		prfi 9341	. . . . . . 7 ⊢ {1, 𝑀} ∈ Fin
61		hashun 14368	. . . . . . 7 ⊢ ((𝐾 ∈ Fin ∧ {1, 𝑀} ∈ Fin ∧ (𝐾 ∩ {1, 𝑀}) = ∅) → (♯‘(𝐾 ∪ {1, 𝑀})) = ((♯‘𝐾) + (♯‘{1, 𝑀})))
62	59, 60, 22, 61	mp3an 1458	. . . . . 6 ⊢ (♯‘(𝐾 ∪ {1, 𝑀})) = ((♯‘𝐾) + (♯‘{1, 𝑀}))
63	54	fveq2d 6896	. . . . . 6 ⊢ (𝜑 → (♯‘(𝐾 ∪ {1, 𝑀})) = (♯‘(1...(𝑁 + 1))))
64		neeq1 2999	. . . . . . . . . . 11 ⊢ (𝑥 = 𝑀 → (𝑥 ≠ 1 ↔ 𝑀 ≠ 1))
65	3, 11	syl 17	. . . . . . . . . . 11 ⊢ (𝑥 ∈ (2...(𝑁 + 1)) → 𝑥 ≠ 1)
66	64, 65	vtoclga 3562	. . . . . . . . . 10 ⊢ (𝑀 ∈ (2...(𝑁 + 1)) → 𝑀 ≠ 1)
67	38, 66	syl 17	. . . . . . . . 9 ⊢ (𝜑 → 𝑀 ≠ 1)
68	67	necomd 2992	. . . . . . . 8 ⊢ (𝜑 → 1 ≠ 𝑀)
69		1ex 11235	. . . . . . . . 9 ⊢ 1 ∈ V
70		subfacp1lem1.x	. . . . . . . . 9 ⊢ 𝑀 ∈ V
71		hashprg 14381	. . . . . . . . 9 ⊢ ((1 ∈ V ∧ 𝑀 ∈ V) → (1 ≠ 𝑀 ↔ (♯‘{1, 𝑀}) = 2))
72	69, 70, 71	mp2an 691	. . . . . . . 8 ⊢ (1 ≠ 𝑀 ↔ (♯‘{1, 𝑀}) = 2)
73	68, 72	sylib 217	. . . . . . 7 ⊢ (𝜑 → (♯‘{1, 𝑀}) = 2)
74	73	oveq2d 7431	. . . . . 6 ⊢ (𝜑 → ((♯‘𝐾) + (♯‘{1, 𝑀})) = ((♯‘𝐾) + 2))
75	62, 63, 74	3eqtr3a 2792	. . . . 5 ⊢ (𝜑 → (♯‘(1...(𝑁 + 1))) = ((♯‘𝐾) + 2))
76	47	nnnn0d 12557	. . . . . 6 ⊢ (𝜑 → (𝑁 + 1) ∈ ℕ₀)
77		hashfz1 14332	. . . . . 6 ⊢ ((𝑁 + 1) ∈ ℕ₀ → (♯‘(1...(𝑁 + 1))) = (𝑁 + 1))
78	76, 77	syl 17	. . . . 5 ⊢ (𝜑 → (♯‘(1...(𝑁 + 1))) = (𝑁 + 1))
79	75, 78	eqtr3d 2770	. . . 4 ⊢ (𝜑 → ((♯‘𝐾) + 2) = (𝑁 + 1))
80	47	nncnd 12253	. . . . 5 ⊢ (𝜑 → (𝑁 + 1) ∈ ℂ)
81		2cnd 12315	. . . . 5 ⊢ (𝜑 → 2 ∈ ℂ)
82		hashcl 14342	. . . . . . . 8 ⊢ (𝐾 ∈ Fin → (♯‘𝐾) ∈ ℕ₀)
83	59, 82	ax-mp 5	. . . . . . 7 ⊢ (♯‘𝐾) ∈ ℕ₀
84	83	nn0cni 12509	. . . . . 6 ⊢ (♯‘𝐾) ∈ ℂ
85	84	a1i 11	. . . . 5 ⊢ (𝜑 → (♯‘𝐾) ∈ ℂ)
86	80, 81, 85	subadd2d 11615	. . . 4 ⊢ (𝜑 → (((𝑁 + 1) − 2) = (♯‘𝐾) ↔ ((♯‘𝐾) + 2) = (𝑁 + 1)))
87	79, 86	mpbird 257	. . 3 ⊢ (𝜑 → ((𝑁 + 1) − 2) = (♯‘𝐾))
88	46	nncnd 12253	. . . 4 ⊢ (𝜑 → 𝑁 ∈ ℂ)
89		1cnd 11234	. . . 4 ⊢ (𝜑 → 1 ∈ ℂ)
90	88, 89, 89	pnpcan2d 11634	. . 3 ⊢ (𝜑 → ((𝑁 + 1) − (1 + 1)) = (𝑁 − 1))
91	55, 87, 90	3eqtr3a 2792	. 2 ⊢ (𝜑 → (♯‘𝐾) = (𝑁 − 1))
92	23, 54, 91	3jca 1126	1 ⊢ (𝜑 → ((𝐾 ∩ {1, 𝑀}) = ∅ ∧ (𝐾 ∪ {1, 𝑀}) = (1...(𝑁 + 1)) ∧ (♯‘𝐾) = (𝑁 − 1)))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 395 ∨ wo 846 ∧ w3a 1085 = wceq 1534 ∈ wcel 2099 {cab 2705 ≠ wne 2936 ∀wral 3057 Vcvv 3470 ∖ cdif 3942 ∪ cun 3943 ∩ cin 3944 ⊆ wss 3945 ∅c0 4319 {csn 4625 {cpr 4627 class class class wbr 5143 ↦ cmpt 5226 –1-1-onto→wf1o 6542 ‘cfv 6543 (class class class)co 7415 Fincfn 8958 ℂcc 11131 1c1 11134 + caddc 11136 < clt 11273 ≤ cle 11274 − cmin 11469 ℕcn 12237 2c2 12292 ℕ₀cn0 12497 ℤcz 12583 ℤ_≥cuz 12847 ...cfz 13511 ♯chash 14316

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-sep 5294 ax-nul 5301 ax-pow 5360 ax-pr 5424 ax-un 7735 ax-cnex 11189 ax-resscn 11190 ax-1cn 11191 ax-icn 11192 ax-addcl 11193 ax-addrcl 11194 ax-mulcl 11195 ax-mulrcl 11196 ax-mulcom 11197 ax-addass 11198 ax-mulass 11199 ax-distr 11200 ax-i2m1 11201 ax-1ne0 11202 ax-1rid 11203 ax-rnegex 11204 ax-rrecex 11205 ax-cnre 11206 ax-pre-lttri 11207 ax-pre-lttrn 11208 ax-pre-ltadd 11209 ax-pre-mulgt0 11210

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2937 df-nel 3043 df-ral 3058 df-rex 3067 df-reu 3373 df-rab 3429 df-v 3472 df-sbc 3776 df-csb 3891 df-dif 3948 df-un 3950 df-in 3952 df-ss 3962 df-pss 3964 df-nul 4320 df-if 4526 df-pw 4601 df-sn 4626 df-pr 4628 df-op 4632 df-uni 4905 df-int 4946 df-iun 4994 df-br 5144 df-opab 5206 df-mpt 5227 df-tr 5261 df-id 5571 df-eprel 5577 df-po 5585 df-so 5586 df-fr 5628 df-we 5630 df-xp 5679 df-rel 5680 df-cnv 5681 df-co 5682 df-dm 5683 df-rn 5684 df-res 5685 df-ima 5686 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-riota 7371 df-ov 7418 df-oprab 7419 df-mpo 7420 df-om 7866 df-1st 7988 df-2nd 7989 df-frecs 8281 df-wrecs 8312 df-recs 8386 df-rdg 8425 df-1o 8481 df-oadd 8485 df-er 8719 df-en 8959 df-dom 8960 df-sdom 8961 df-fin 8962 df-dju 9919 df-card 9957 df-pnf 11275 df-mnf 11276 df-xr 11277 df-ltxr 11278 df-le 11279 df-sub 11471 df-neg 11472 df-nn 12238 df-2 12300 df-n0 12498 df-z 12584 df-uz 12848 df-fz 13512 df-hash 14317

This theorem is referenced by: subfacp1lem2a 34785 subfacp1lem3 34787 subfacp1lem4 34788

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