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Theorem incexc2 15803

Description: The inclusion/exclusion principle for counting the elements of a finite union of finite sets. (Contributed by Mario Carneiro, 7-Aug-2017.)

**Assertion**
Ref	Expression
incexc2	⊢ ((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) → (♯‘∪ 𝐴) = Σ𝑛 ∈ (1...(♯‘𝐴))((-1↑(𝑛 − 1)) · Σ𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} (♯‘∩ 𝑠)))

Distinct variable group: 𝑘,𝑛,𝑠,𝐴

**Proof of Theorem incexc2**
Step	Hyp	Ref	Expression
1		incexc 15802	. . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) → (♯‘∪ 𝐴) = Σ𝑠 ∈ (𝒫 𝐴 ∖ {∅})((-1↑((♯‘𝑠) − 1)) · (♯‘∩ 𝑠)))
2		hashcl 14318	. . . . . . . . . . . 12 ⊢ (𝐴 ∈ Fin → (♯‘𝐴) ∈ ℕ₀)
3	2	ad2antrr 727	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑘 ∈ 𝒫 𝐴) → (♯‘𝐴) ∈ ℕ₀)
4	3	nn0zd 12549	. . . . . . . . . 10 ⊢ (((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑘 ∈ 𝒫 𝐴) → (♯‘𝐴) ∈ ℤ)
5		simpl 482	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) → 𝐴 ∈ Fin)
6		elpwi 4548	. . . . . . . . . . . 12 ⊢ (𝑘 ∈ 𝒫 𝐴 → 𝑘 ⊆ 𝐴)
7		ssdomg 8947	. . . . . . . . . . . . 13 ⊢ (𝐴 ∈ Fin → (𝑘 ⊆ 𝐴 → 𝑘 ≼ 𝐴))
8	7	imp 406	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ Fin ∧ 𝑘 ⊆ 𝐴) → 𝑘 ≼ 𝐴)
9	5, 6, 8	syl2an 597	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑘 ∈ 𝒫 𝐴) → 𝑘 ≼ 𝐴)
10		hashdomi 14342	. . . . . . . . . . 11 ⊢ (𝑘 ≼ 𝐴 → (♯‘𝑘) ≤ (♯‘𝐴))
11	9, 10	syl 17	. . . . . . . . . 10 ⊢ (((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑘 ∈ 𝒫 𝐴) → (♯‘𝑘) ≤ (♯‘𝐴))
12		fznn 13546	. . . . . . . . . . 11 ⊢ ((♯‘𝐴) ∈ ℤ → ((♯‘𝑘) ∈ (1...(♯‘𝐴)) ↔ ((♯‘𝑘) ∈ ℕ ∧ (♯‘𝑘) ≤ (♯‘𝐴))))
13	12	rbaibd 540	. . . . . . . . . 10 ⊢ (((♯‘𝐴) ∈ ℤ ∧ (♯‘𝑘) ≤ (♯‘𝐴)) → ((♯‘𝑘) ∈ (1...(♯‘𝐴)) ↔ (♯‘𝑘) ∈ ℕ))
14	4, 11, 13	syl2anc 585	. . . . . . . . 9 ⊢ (((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑘 ∈ 𝒫 𝐴) → ((♯‘𝑘) ∈ (1...(♯‘𝐴)) ↔ (♯‘𝑘) ∈ ℕ))
15		ssfi 9107	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ Fin ∧ 𝑘 ⊆ 𝐴) → 𝑘 ∈ Fin)
16	5, 6, 15	syl2an 597	. . . . . . . . . 10 ⊢ (((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑘 ∈ 𝒫 𝐴) → 𝑘 ∈ Fin)
17		hashnncl 14328	. . . . . . . . . 10 ⊢ (𝑘 ∈ Fin → ((♯‘𝑘) ∈ ℕ ↔ 𝑘 ≠ ∅))
18	16, 17	syl 17	. . . . . . . . 9 ⊢ (((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑘 ∈ 𝒫 𝐴) → ((♯‘𝑘) ∈ ℕ ↔ 𝑘 ≠ ∅))
19	14, 18	bitr2d 280	. . . . . . . 8 ⊢ (((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑘 ∈ 𝒫 𝐴) → (𝑘 ≠ ∅ ↔ (♯‘𝑘) ∈ (1...(♯‘𝐴))))
20		df-ne 2933	. . . . . . . 8 ⊢ (𝑘 ≠ ∅ ↔ ¬ 𝑘 = ∅)
21		risset 3212	. . . . . . . 8 ⊢ ((♯‘𝑘) ∈ (1...(♯‘𝐴)) ↔ ∃𝑛 ∈ (1...(♯‘𝐴))𝑛 = (♯‘𝑘))
22	19, 20, 21	3bitr3g 313	. . . . . . 7 ⊢ (((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑘 ∈ 𝒫 𝐴) → (¬ 𝑘 = ∅ ↔ ∃𝑛 ∈ (1...(♯‘𝐴))𝑛 = (♯‘𝑘)))
23		velsn 4583	. . . . . . . 8 ⊢ (𝑘 ∈ {∅} ↔ 𝑘 = ∅)
24	23	notbii 320	. . . . . . 7 ⊢ (¬ 𝑘 ∈ {∅} ↔ ¬ 𝑘 = ∅)
25		eqcom 2743	. . . . . . . 8 ⊢ ((♯‘𝑘) = 𝑛 ↔ 𝑛 = (♯‘𝑘))
26	25	rexbii 3084	. . . . . . 7 ⊢ (∃𝑛 ∈ (1...(♯‘𝐴))(♯‘𝑘) = 𝑛 ↔ ∃𝑛 ∈ (1...(♯‘𝐴))𝑛 = (♯‘𝑘))
27	22, 24, 26	3bitr4g 314	. . . . . 6 ⊢ (((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑘 ∈ 𝒫 𝐴) → (¬ 𝑘 ∈ {∅} ↔ ∃𝑛 ∈ (1...(♯‘𝐴))(♯‘𝑘) = 𝑛))
28	27	rabbidva 3395	. . . . 5 ⊢ ((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) → {𝑘 ∈ 𝒫 𝐴 ∣ ¬ 𝑘 ∈ {∅}} = {𝑘 ∈ 𝒫 𝐴 ∣ ∃𝑛 ∈ (1...(♯‘𝐴))(♯‘𝑘) = 𝑛})
29		dfdif2 3898	. . . . 5 ⊢ (𝒫 𝐴 ∖ {∅}) = {𝑘 ∈ 𝒫 𝐴 ∣ ¬ 𝑘 ∈ {∅}}
30		iunrab 4995	. . . . 5 ⊢ ∪ 𝑛 ∈ (1...(♯‘𝐴)){𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} = {𝑘 ∈ 𝒫 𝐴 ∣ ∃𝑛 ∈ (1...(♯‘𝐴))(♯‘𝑘) = 𝑛}
31	28, 29, 30	3eqtr4g 2796	. . . 4 ⊢ ((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) → (𝒫 𝐴 ∖ {∅}) = ∪ 𝑛 ∈ (1...(♯‘𝐴)){𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛})
32	31	sumeq1d 15662	. . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) → Σ𝑠 ∈ (𝒫 𝐴 ∖ {∅})((-1↑((♯‘𝑠) − 1)) · (♯‘∩ 𝑠)) = Σ𝑠 ∈ ∪ 𝑛 ∈ (1...(♯‘𝐴)){𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} ((-1↑((♯‘𝑠) − 1)) · (♯‘∩ 𝑠)))
33	1, 32	eqtrd 2771	. 2 ⊢ ((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) → (♯‘∪ 𝐴) = Σ𝑠 ∈ ∪ 𝑛 ∈ (1...(♯‘𝐴)){𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} ((-1↑((♯‘𝑠) − 1)) · (♯‘∩ 𝑠)))
34		fzfid 13935	. . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) → (1...(♯‘𝐴)) ∈ Fin)
35		simpll 767	. . . . 5 ⊢ (((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → 𝐴 ∈ Fin)
36		pwfi 9229	. . . . 5 ⊢ (𝐴 ∈ Fin ↔ 𝒫 𝐴 ∈ Fin)
37	35, 36	sylib 218	. . . 4 ⊢ (((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → 𝒫 𝐴 ∈ Fin)
38		ssrab2 4020	. . . 4 ⊢ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} ⊆ 𝒫 𝐴
39		ssfi 9107	. . . 4 ⊢ ((𝒫 𝐴 ∈ Fin ∧ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} ⊆ 𝒫 𝐴) → {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} ∈ Fin)
40	37, 38, 39	sylancl 587	. . 3 ⊢ (((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} ∈ Fin)
41		fveqeq2 6849	. . . . . . . . 9 ⊢ (𝑘 = 𝑠 → ((♯‘𝑘) = 𝑛 ↔ (♯‘𝑠) = 𝑛))
42	41	elrab 3634	. . . . . . . 8 ⊢ (𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} ↔ (𝑠 ∈ 𝒫 𝐴 ∧ (♯‘𝑠) = 𝑛))
43	42	simprbi 497	. . . . . . 7 ⊢ (𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} → (♯‘𝑠) = 𝑛)
44	43	adantl 481	. . . . . 6 ⊢ ((((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) ∧ 𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛}) → (♯‘𝑠) = 𝑛)
45	44	ralrimiva 3129	. . . . 5 ⊢ (((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → ∀𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} (♯‘𝑠) = 𝑛)
46	45	ralrimiva 3129	. . . 4 ⊢ ((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) → ∀𝑛 ∈ (1...(♯‘𝐴))∀𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} (♯‘𝑠) = 𝑛)
47		invdisj 5071	. . . 4 ⊢ (∀𝑛 ∈ (1...(♯‘𝐴))∀𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} (♯‘𝑠) = 𝑛 → Disj 𝑛 ∈ (1...(♯‘𝐴)){𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛})
48	46, 47	syl 17	. . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) → Disj 𝑛 ∈ (1...(♯‘𝐴)){𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛})
49	44	oveq1d 7382	. . . . . . 7 ⊢ ((((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) ∧ 𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛}) → ((♯‘𝑠) − 1) = (𝑛 − 1))
50	49	oveq2d 7383	. . . . . 6 ⊢ ((((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) ∧ 𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛}) → (-1↑((♯‘𝑠) − 1)) = (-1↑(𝑛 − 1)))
51	50	oveq1d 7382	. . . . 5 ⊢ ((((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) ∧ 𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛}) → ((-1↑((♯‘𝑠) − 1)) · (♯‘∩ 𝑠)) = ((-1↑(𝑛 − 1)) · (♯‘∩ 𝑠)))
52		1cnd 11139	. . . . . . . . 9 ⊢ (((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → 1 ∈ ℂ)
53	52	negcld 11492	. . . . . . . 8 ⊢ (((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → -1 ∈ ℂ)
54		elfznn 13507	. . . . . . . . . 10 ⊢ (𝑛 ∈ (1...(♯‘𝐴)) → 𝑛 ∈ ℕ)
55	54	adantl 481	. . . . . . . . 9 ⊢ (((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → 𝑛 ∈ ℕ)
56		nnm1nn0 12478	. . . . . . . . 9 ⊢ (𝑛 ∈ ℕ → (𝑛 − 1) ∈ ℕ₀)
57	55, 56	syl 17	. . . . . . . 8 ⊢ (((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → (𝑛 − 1) ∈ ℕ₀)
58	53, 57	expcld 14108	. . . . . . 7 ⊢ (((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → (-1↑(𝑛 − 1)) ∈ ℂ)
59	58	adantr 480	. . . . . 6 ⊢ ((((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) ∧ 𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛}) → (-1↑(𝑛 − 1)) ∈ ℂ)
60		unifi 9254	. . . . . . . . . 10 ⊢ ((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) → ∪ 𝐴 ∈ Fin)
61	60	ad2antrr 727	. . . . . . . . 9 ⊢ ((((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) ∧ 𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛}) → ∪ 𝐴 ∈ Fin)
62	55	adantr 480	. . . . . . . . . . . . 13 ⊢ ((((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) ∧ 𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛}) → 𝑛 ∈ ℕ)
63	44, 62	eqeltrd 2836	. . . . . . . . . . . 12 ⊢ ((((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) ∧ 𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛}) → (♯‘𝑠) ∈ ℕ)
64	35	adantr 480	. . . . . . . . . . . . . 14 ⊢ ((((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) ∧ 𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛}) → 𝐴 ∈ Fin)
65		elrabi 3630	. . . . . . . . . . . . . . . 16 ⊢ (𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} → 𝑠 ∈ 𝒫 𝐴)
66	65	adantl 481	. . . . . . . . . . . . . . 15 ⊢ ((((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) ∧ 𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛}) → 𝑠 ∈ 𝒫 𝐴)
67		elpwi 4548	. . . . . . . . . . . . . . 15 ⊢ (𝑠 ∈ 𝒫 𝐴 → 𝑠 ⊆ 𝐴)
68	66, 67	syl 17	. . . . . . . . . . . . . 14 ⊢ ((((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) ∧ 𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛}) → 𝑠 ⊆ 𝐴)
69	64, 68	ssfid 9179	. . . . . . . . . . . . 13 ⊢ ((((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) ∧ 𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛}) → 𝑠 ∈ Fin)
70		hashnncl 14328	. . . . . . . . . . . . 13 ⊢ (𝑠 ∈ Fin → ((♯‘𝑠) ∈ ℕ ↔ 𝑠 ≠ ∅))
71	69, 70	syl 17	. . . . . . . . . . . 12 ⊢ ((((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) ∧ 𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛}) → ((♯‘𝑠) ∈ ℕ ↔ 𝑠 ≠ ∅))
72	63, 71	mpbid 232	. . . . . . . . . . 11 ⊢ ((((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) ∧ 𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛}) → 𝑠 ≠ ∅)
73		intssuni 4912	. . . . . . . . . . 11 ⊢ (𝑠 ≠ ∅ → ∩ 𝑠 ⊆ ∪ 𝑠)
74	72, 73	syl 17	. . . . . . . . . 10 ⊢ ((((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) ∧ 𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛}) → ∩ 𝑠 ⊆ ∪ 𝑠)
75	68	unissd 4860	. . . . . . . . . 10 ⊢ ((((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) ∧ 𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛}) → ∪ 𝑠 ⊆ ∪ 𝐴)
76	74, 75	sstrd 3932	. . . . . . . . 9 ⊢ ((((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) ∧ 𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛}) → ∩ 𝑠 ⊆ ∪ 𝐴)
77	61, 76	ssfid 9179	. . . . . . . 8 ⊢ ((((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) ∧ 𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛}) → ∩ 𝑠 ∈ Fin)
78		hashcl 14318	. . . . . . . 8 ⊢ (∩ 𝑠 ∈ Fin → (♯‘∩ 𝑠) ∈ ℕ₀)
79	77, 78	syl 17	. . . . . . 7 ⊢ ((((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) ∧ 𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛}) → (♯‘∩ 𝑠) ∈ ℕ₀)
80	79	nn0cnd 12500	. . . . . 6 ⊢ ((((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) ∧ 𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛}) → (♯‘∩ 𝑠) ∈ ℂ)
81	59, 80	mulcld 11165	. . . . 5 ⊢ ((((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) ∧ 𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛}) → ((-1↑(𝑛 − 1)) · (♯‘∩ 𝑠)) ∈ ℂ)
82	51, 81	eqeltrd 2836	. . . 4 ⊢ ((((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) ∧ 𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛}) → ((-1↑((♯‘𝑠) − 1)) · (♯‘∩ 𝑠)) ∈ ℂ)
83	82	anasss 466	. . 3 ⊢ (((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ (𝑛 ∈ (1...(♯‘𝐴)) ∧ 𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛})) → ((-1↑((♯‘𝑠) − 1)) · (♯‘∩ 𝑠)) ∈ ℂ)
84	34, 40, 48, 83	fsumiun 15784	. 2 ⊢ ((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) → Σ𝑠 ∈ ∪ 𝑛 ∈ (1...(♯‘𝐴)){𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} ((-1↑((♯‘𝑠) − 1)) · (♯‘∩ 𝑠)) = Σ𝑛 ∈ (1...(♯‘𝐴))Σ𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} ((-1↑((♯‘𝑠) − 1)) · (♯‘∩ 𝑠)))
85	51	sumeq2dv 15664	. . . 4 ⊢ (((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → Σ𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} ((-1↑((♯‘𝑠) − 1)) · (♯‘∩ 𝑠)) = Σ𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} ((-1↑(𝑛 − 1)) · (♯‘∩ 𝑠)))
86	40, 58, 80	fsummulc2 15746	. . . 4 ⊢ (((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → ((-1↑(𝑛 − 1)) · Σ𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} (♯‘∩ 𝑠)) = Σ𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} ((-1↑(𝑛 − 1)) · (♯‘∩ 𝑠)))
87	85, 86	eqtr4d 2774	. . 3 ⊢ (((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → Σ𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} ((-1↑((♯‘𝑠) − 1)) · (♯‘∩ 𝑠)) = ((-1↑(𝑛 − 1)) · Σ𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} (♯‘∩ 𝑠)))
88	87	sumeq2dv 15664	. 2 ⊢ ((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) → Σ𝑛 ∈ (1...(♯‘𝐴))Σ𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} ((-1↑((♯‘𝑠) − 1)) · (♯‘∩ 𝑠)) = Σ𝑛 ∈ (1...(♯‘𝐴))((-1↑(𝑛 − 1)) · Σ𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} (♯‘∩ 𝑠)))
89	33, 84, 88	3eqtrd 2775	1 ⊢ ((𝐴 ∈ Fin ∧ 𝐴 ⊆ Fin) → (♯‘∪ 𝐴) = Σ𝑛 ∈ (1...(♯‘𝐴))((-1↑(𝑛 − 1)) · Σ𝑠 ∈ {𝑘 ∈ 𝒫 𝐴 ∣ (♯‘𝑘) = 𝑛} (♯‘∩ 𝑠)))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 206 ∧ wa 395 = wceq 1542 ∈ wcel 2114 ≠ wne 2932 ∀wral 3051 ∃wrex 3061 {crab 3389 ∖ cdif 3886 ⊆ wss 3889 ∅c0 4273 𝒫 cpw 4541 {csn 4567 ∪ cuni 4850 ∩ cint 4889 ∪ ciun 4933 Disj wdisj 5052 class class class wbr 5085 ‘cfv 6498 (class class class)co 7367 ≼ cdom 8891 Fincfn 8893 ℂcc 11036 1c1 11039 · cmul 11043 ≤ cle 11180 − cmin 11377 -cneg 11378 ℕcn 12174 ℕ₀cn0 12437 ℤcz 12524 ...cfz 13461 ↑cexp 14023 ♯chash 14292 Σcsu 15648

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 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2708 ax-rep 5212 ax-sep 5231 ax-nul 5241 ax-pow 5307 ax-pr 5375 ax-un 7689 ax-inf2 9562 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 ax-pre-mulgt0 11115 ax-pre-sup 11116

This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3062 df-rmo 3342 df-reu 3343 df-rab 3390 df-v 3431 df-sbc 3729 df-csb 3838 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-pss 3909 df-nul 4274 df-if 4467 df-pw 4543 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-int 4890 df-iun 4935 df-disj 5053 df-br 5086 df-opab 5148 df-mpt 5167 df-tr 5193 df-id 5526 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-se 5585 df-we 5586 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-pred 6265 df-ord 6326 df-on 6327 df-lim 6328 df-suc 6329 df-iota 6454 df-fun 6500 df-fn 6501 df-f 6502 df-f1 6503 df-fo 6504 df-f1o 6505 df-fv 6506 df-isom 6507 df-riota 7324 df-ov 7370 df-oprab 7371 df-mpo 7372 df-om 7818 df-1st 7942 df-2nd 7943 df-frecs 8231 df-wrecs 8262 df-recs 8311 df-rdg 8349 df-1o 8405 df-oadd 8409 df-er 8643 df-en 8894 df-dom 8895 df-sdom 8896 df-fin 8897 df-sup 9355 df-oi 9425 df-dju 9825 df-card 9863 df-pnf 11181 df-mnf 11182 df-xr 11183 df-ltxr 11184 df-le 11185 df-sub 11379 df-neg 11380 df-div 11808 df-nn 12175 df-2 12244 df-3 12245 df-n0 12438 df-xnn0 12511 df-z 12525 df-uz 12789 df-rp 12943 df-fz 13462 df-fzo 13609 df-seq 13964 df-exp 14024 df-hash 14293 df-cj 15061 df-re 15062 df-im 15063 df-sqrt 15197 df-abs 15198 df-clim 15450 df-sum 15649

This theorem is referenced by: (None)

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