subfacp1lem1 - Mathbox for Mario Carneiro

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Theorem subfacp1lem1 34465

Description: Lemma for subfacp1 34472. 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 4448	. . . 4 ⊢ ((𝐾 ∩ {1, 𝑀}) = ∅ ↔ ∀𝑥 ∈ 𝐾 ¬ 𝑥 ∈ {1, 𝑀})
2		eldifi 4127	. . . . . . . . 9 ⊢ (𝑥 ∈ ((2...(𝑁 + 1)) ∖ {𝑀}) → 𝑥 ∈ (2...(𝑁 + 1)))
3		elfzle1 13509	. . . . . . . . 9 ⊢ (𝑥 ∈ (2...(𝑁 + 1)) → 2 ≤ 𝑥)
4		1lt2 12388	. . . . . . . . . . . 12 ⊢ 1 < 2
5		1re 11219	. . . . . . . . . . . . 13 ⊢ 1 ∈ ℝ
6		2re 12291	. . . . . . . . . . . . 13 ⊢ 2 ∈ ℝ
7	5, 6	ltnlei 11340	. . . . . . . . . . . 12 ⊢ (1 < 2 ↔ ¬ 2 ≤ 1)
8	4, 7	mpbi 229	. . . . . . . . . . 11 ⊢ ¬ 2 ≤ 1
9		breq2 5153	. . . . . . . . . . 11 ⊢ (𝑥 = 1 → (2 ≤ 𝑥 ↔ 2 ≤ 1))
10	8, 9	mtbiri 326	. . . . . . . . . 10 ⊢ (𝑥 = 1 → ¬ 2 ≤ 𝑥)
11	10	necon2ai 2969	. . . . . . . . 9 ⊢ (2 ≤ 𝑥 → 𝑥 ≠ 1)
12	2, 3, 11	3syl 18	. . . . . . . 8 ⊢ (𝑥 ∈ ((2...(𝑁 + 1)) ∖ {𝑀}) → 𝑥 ≠ 1)
13		eldifsni 4794	. . . . . . . 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 2850	. . . . . 6 ⊢ (𝑥 ∈ 𝐾 → (𝑥 ≠ 1 ∧ 𝑥 ≠ 𝑀))
17		neanior 3034	. . . . . 6 ⊢ ((𝑥 ≠ 1 ∧ 𝑥 ≠ 𝑀) ↔ ¬ (𝑥 = 1 ∨ 𝑥 = 𝑀))
18	16, 17	sylib 217	. . . . 5 ⊢ (𝑥 ∈ 𝐾 → ¬ (𝑥 = 1 ∨ 𝑥 = 𝑀))
19		vex 3477	. . . . . 6 ⊢ 𝑥 ∈ V
20	19	elpr 4652	. . . . 5 ⊢ (𝑥 ∈ {1, 𝑀} ↔ (𝑥 = 1 ∨ 𝑥 = 𝑀))
21	18, 20	sylnibr 328	. . . 4 ⊢ (𝑥 ∈ 𝐾 → ¬ 𝑥 ∈ {1, 𝑀})
22	1, 21	mprgbir 3067	. . 3 ⊢ (𝐾 ∩ {1, 𝑀}) = ∅
23	22	a1i 11	. 2 ⊢ (𝜑 → (𝐾 ∩ {1, 𝑀}) = ∅)
24		uncom 4154	. . . 4 ⊢ ({1} ∪ (𝐾 ∪ {𝑀})) = ((𝐾 ∪ {𝑀}) ∪ {1})
25		1z 12597	. . . . . 6 ⊢ 1 ∈ ℤ
26		fzsn 13548	. . . . . 6 ⊢ (1 ∈ ℤ → (1...1) = {1})
27	25, 26	ax-mp 5	. . . . 5 ⊢ (1...1) = {1}
28	15	uneq1i 4160	. . . . . 6 ⊢ (𝐾 ∪ {𝑀}) = (((2...(𝑁 + 1)) ∖ {𝑀}) ∪ {𝑀})
29		undif1 4476	. . . . . 6 ⊢ (((2...(𝑁 + 1)) ∖ {𝑀}) ∪ {𝑀}) = ((2...(𝑁 + 1)) ∪ {𝑀})
30	28, 29	eqtr2i 2760	. . . . 5 ⊢ ((2...(𝑁 + 1)) ∪ {𝑀}) = (𝐾 ∪ {𝑀})
31	27, 30	uneq12i 4162	. . . 4 ⊢ ((1...1) ∪ ((2...(𝑁 + 1)) ∪ {𝑀})) = ({1} ∪ (𝐾 ∪ {𝑀}))
32		df-pr 4632	. . . . . . 7 ⊢ {1, 𝑀} = ({1} ∪ {𝑀})
33	32	equncomi 4156	. . . . . 6 ⊢ {1, 𝑀} = ({𝑀} ∪ {1})
34	33	uneq2i 4161	. . . . 5 ⊢ (𝐾 ∪ {1, 𝑀}) = (𝐾 ∪ ({𝑀} ∪ {1}))
35		unass 4167	. . . . 5 ⊢ ((𝐾 ∪ {𝑀}) ∪ {1}) = (𝐾 ∪ ({𝑀} ∪ {1}))
36	34, 35	eqtr4i 2762	. . . 4 ⊢ (𝐾 ∪ {1, 𝑀}) = ((𝐾 ∪ {𝑀}) ∪ {1})
37	24, 31, 36	3eqtr4i 2769	. . 3 ⊢ ((1...1) ∪ ((2...(𝑁 + 1)) ∪ {𝑀})) = (𝐾 ∪ {1, 𝑀})
38		subfacp1lem1.m	. . . . . . . 8 ⊢ (𝜑 → 𝑀 ∈ (2...(𝑁 + 1)))
39	38	snssd 4813	. . . . . . 7 ⊢ (𝜑 → {𝑀} ⊆ (2...(𝑁 + 1)))
40		ssequn2 4184	. . . . . . 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 12280	. . . . . . 7 ⊢ 2 = (1 + 1)
43	42	oveq1i 7422	. . . . . 6 ⊢ (2...(𝑁 + 1)) = ((1 + 1)...(𝑁 + 1))
44	41, 43	eqtrdi 2787	. . . . 5 ⊢ (𝜑 → ((2...(𝑁 + 1)) ∪ {𝑀}) = ((1 + 1)...(𝑁 + 1)))
45	44	uneq2d 4164	. . . 4 ⊢ (𝜑 → ((1...1) ∪ ((2...(𝑁 + 1)) ∪ {𝑀})) = ((1...1) ∪ ((1 + 1)...(𝑁 + 1))))
46		subfacp1lem1.n	. . . . . . 7 ⊢ (𝜑 → 𝑁 ∈ ℕ)
47	46	peano2nnd 12234	. . . . . 6 ⊢ (𝜑 → (𝑁 + 1) ∈ ℕ)
48		nnuz 12870	. . . . . 6 ⊢ ℕ = (ℤ_≥‘1)
49	47, 48	eleqtrdi 2842	. . . . 5 ⊢ (𝜑 → (𝑁 + 1) ∈ (ℤ_≥‘1))
50		eluzfz1 13513	. . . . 5 ⊢ ((𝑁 + 1) ∈ (ℤ_≥‘1) → 1 ∈ (1...(𝑁 + 1)))
51		fzsplit 13532	. . . . 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 2774	. . 3 ⊢ (𝜑 → ((1...1) ∪ ((2...(𝑁 + 1)) ∪ {𝑀})) = (1...(𝑁 + 1)))
54	37, 53	eqtr3id 2785	. 2 ⊢ (𝜑 → (𝐾 ∪ {1, 𝑀}) = (1...(𝑁 + 1)))
55	42	oveq2i 7423	. . 3 ⊢ ((𝑁 + 1) − 2) = ((𝑁 + 1) − (1 + 1))
56		fzfi 13942	. . . . . . . . 9 ⊢ (2...(𝑁 + 1)) ∈ Fin
57		diffi 9182	. . . . . . . . 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 2828	. . . . . . 7 ⊢ 𝐾 ∈ Fin
60		prfi 9325	. . . . . . 7 ⊢ {1, 𝑀} ∈ Fin
61		hashun 14347	. . . . . . 7 ⊢ ((𝐾 ∈ Fin ∧ {1, 𝑀} ∈ Fin ∧ (𝐾 ∩ {1, 𝑀}) = ∅) → (♯‘(𝐾 ∪ {1, 𝑀})) = ((♯‘𝐾) + (♯‘{1, 𝑀})))
62	59, 60, 22, 61	mp3an 1460	. . . . . 6 ⊢ (♯‘(𝐾 ∪ {1, 𝑀})) = ((♯‘𝐾) + (♯‘{1, 𝑀}))
63	54	fveq2d 6896	. . . . . 6 ⊢ (𝜑 → (♯‘(𝐾 ∪ {1, 𝑀})) = (♯‘(1...(𝑁 + 1))))
64		neeq1 3002	. . . . . . . . . . 11 ⊢ (𝑥 = 𝑀 → (𝑥 ≠ 1 ↔ 𝑀 ≠ 1))
65	3, 11	syl 17	. . . . . . . . . . 11 ⊢ (𝑥 ∈ (2...(𝑁 + 1)) → 𝑥 ≠ 1)
66	64, 65	vtoclga 3566	. . . . . . . . . 10 ⊢ (𝑀 ∈ (2...(𝑁 + 1)) → 𝑀 ≠ 1)
67	38, 66	syl 17	. . . . . . . . 9 ⊢ (𝜑 → 𝑀 ≠ 1)
68	67	necomd 2995	. . . . . . . 8 ⊢ (𝜑 → 1 ≠ 𝑀)
69		1ex 11215	. . . . . . . . 9 ⊢ 1 ∈ V
70		subfacp1lem1.x	. . . . . . . . 9 ⊢ 𝑀 ∈ V
71		hashprg 14360	. . . . . . . . 9 ⊢ ((1 ∈ V ∧ 𝑀 ∈ V) → (1 ≠ 𝑀 ↔ (♯‘{1, 𝑀}) = 2))
72	69, 70, 71	mp2an 689	. . . . . . . 8 ⊢ (1 ≠ 𝑀 ↔ (♯‘{1, 𝑀}) = 2)
73	68, 72	sylib 217	. . . . . . 7 ⊢ (𝜑 → (♯‘{1, 𝑀}) = 2)
74	73	oveq2d 7428	. . . . . 6 ⊢ (𝜑 → ((♯‘𝐾) + (♯‘{1, 𝑀})) = ((♯‘𝐾) + 2))
75	62, 63, 74	3eqtr3a 2795	. . . . 5 ⊢ (𝜑 → (♯‘(1...(𝑁 + 1))) = ((♯‘𝐾) + 2))
76	47	nnnn0d 12537	. . . . . 6 ⊢ (𝜑 → (𝑁 + 1) ∈ ℕ₀)
77		hashfz1 14311	. . . . . 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 2773	. . . 4 ⊢ (𝜑 → ((♯‘𝐾) + 2) = (𝑁 + 1))
80	47	nncnd 12233	. . . . 5 ⊢ (𝜑 → (𝑁 + 1) ∈ ℂ)
81		2cnd 12295	. . . . 5 ⊢ (𝜑 → 2 ∈ ℂ)
82		hashcl 14321	. . . . . . . 8 ⊢ (𝐾 ∈ Fin → (♯‘𝐾) ∈ ℕ₀)
83	59, 82	ax-mp 5	. . . . . . 7 ⊢ (♯‘𝐾) ∈ ℕ₀
84	83	nn0cni 12489	. . . . . 6 ⊢ (♯‘𝐾) ∈ ℂ
85	84	a1i 11	. . . . 5 ⊢ (𝜑 → (♯‘𝐾) ∈ ℂ)
86	80, 81, 85	subadd2d 11595	. . . 4 ⊢ (𝜑 → (((𝑁 + 1) − 2) = (♯‘𝐾) ↔ ((♯‘𝐾) + 2) = (𝑁 + 1)))
87	79, 86	mpbird 256	. . 3 ⊢ (𝜑 → ((𝑁 + 1) − 2) = (♯‘𝐾))
88	46	nncnd 12233	. . . 4 ⊢ (𝜑 → 𝑁 ∈ ℂ)
89		1cnd 11214	. . . 4 ⊢ (𝜑 → 1 ∈ ℂ)
90	88, 89, 89	pnpcan2d 11614	. . 3 ⊢ (𝜑 → ((𝑁 + 1) − (1 + 1)) = (𝑁 − 1))
91	55, 87, 90	3eqtr3a 2795	. 2 ⊢ (𝜑 → (♯‘𝐾) = (𝑁 − 1))
92	23, 54, 91	3jca 1127	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 844 ∧ w3a 1086 = wceq 1540 ∈ wcel 2105 {cab 2708 ≠ wne 2939 ∀wral 3060 Vcvv 3473 ∖ cdif 3946 ∪ cun 3947 ∩ cin 3948 ⊆ wss 3949 ∅c0 4323 {csn 4629 {cpr 4631 class class class wbr 5149 ↦ cmpt 5232 –1-1-onto→wf1o 6543 ‘cfv 6544 (class class class)co 7412 Fincfn 8942 ℂcc 11111 1c1 11114 + caddc 11116 < clt 11253 ≤ cle 11254 − cmin 11449 ℕcn 12217 2c2 12272 ℕ₀cn0 12477 ℤcz 12563 ℤ_≥cuz 12827 ...cfz 13489 ♯chash 14295

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1912 ax-6 1970 ax-7 2010 ax-8 2107 ax-9 2115 ax-10 2136 ax-11 2153 ax-12 2170 ax-ext 2702 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7728 ax-cnex 11169 ax-resscn 11170 ax-1cn 11171 ax-icn 11172 ax-addcl 11173 ax-addrcl 11174 ax-mulcl 11175 ax-mulrcl 11176 ax-mulcom 11177 ax-addass 11178 ax-mulass 11179 ax-distr 11180 ax-i2m1 11181 ax-1ne0 11182 ax-1rid 11183 ax-rnegex 11184 ax-rrecex 11185 ax-cnre 11186 ax-pre-lttri 11187 ax-pre-lttrn 11188 ax-pre-ltadd 11189 ax-pre-mulgt0 11190

This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1781 df-nf 1785 df-sb 2067 df-mo 2533 df-eu 2562 df-clab 2709 df-cleq 2723 df-clel 2809 df-nfc 2884 df-ne 2940 df-nel 3046 df-ral 3061 df-rex 3070 df-reu 3376 df-rab 3432 df-v 3475 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4910 df-int 4952 df-iun 5000 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5575 df-eprel 5581 df-po 5589 df-so 5590 df-fr 5632 df-we 5634 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-pred 6301 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-riota 7368 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7859 df-1st 7978 df-2nd 7979 df-frecs 8269 df-wrecs 8300 df-recs 8374 df-rdg 8413 df-1o 8469 df-oadd 8473 df-er 8706 df-en 8943 df-dom 8944 df-sdom 8945 df-fin 8946 df-dju 9899 df-card 9937 df-pnf 11255 df-mnf 11256 df-xr 11257 df-ltxr 11258 df-le 11259 df-sub 11451 df-neg 11452 df-nn 12218 df-2 12280 df-n0 12478 df-z 12564 df-uz 12828 df-fz 13490 df-hash 14296

This theorem is referenced by: subfacp1lem2a 34466 subfacp1lem3 34468 subfacp1lem4 34469

W3C validator