Theorem indf1ofs 32796

Description: The bijection between finite subsets and the indicator functions with finite support. (Contributed by Thierry Arnoux, 22-Aug-2017.)

Assertion

Ref	Expression
indf1ofs	⊢ (𝑂 ∈ 𝑉 → ((𝟭‘𝑂) ↾ Fin):(𝒫 𝑂 ∩ Fin)–1-1-onto→{𝑓 ∈ ({0, 1} ↑m 𝑂) ∣ (◡𝑓 “ {1}) ∈ Fin})

Distinct variable group:   𝑓,𝑂

Allowed substitution hint:   𝑉(𝑓)

Proof of Theorem indf1ofs

Dummy variables 𝑎 𝑔 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		indf1o 32794	. . . 4 ⊢ (𝑂 ∈ 𝑉 → (𝟭‘𝑂):𝒫 𝑂–1-1-onto→({0, 1} ↑m 𝑂))
2		f1of1 6802	. . . 4 ⊢ ((𝟭‘𝑂):𝒫 𝑂–1-1-onto→({0, 1} ↑m 𝑂) → (𝟭‘𝑂):𝒫 𝑂–1-1→({0, 1} ↑m 𝑂))
3	1, 2	syl 17	. . 3 ⊢ (𝑂 ∈ 𝑉 → (𝟭‘𝑂):𝒫 𝑂–1-1→({0, 1} ↑m 𝑂))
4		inss1 4203	. . 3 ⊢ (𝒫 𝑂 ∩ Fin) ⊆ 𝒫 𝑂
5		f1ores 6817	. . 3 ⊢ (((𝟭‘𝑂):𝒫 𝑂–1-1→({0, 1} ↑m 𝑂) ∧ (𝒫 𝑂 ∩ Fin) ⊆ 𝒫 𝑂) → ((𝟭‘𝑂) ↾ (𝒫 𝑂 ∩ Fin)):(𝒫 𝑂 ∩ Fin)–1-1-onto→((𝟭‘𝑂) “ (𝒫 𝑂 ∩ Fin)))
6	3, 4, 5	sylancl 586	. 2 ⊢ (𝑂 ∈ 𝑉 → ((𝟭‘𝑂) ↾ (𝒫 𝑂 ∩ Fin)):(𝒫 𝑂 ∩ Fin)–1-1-onto→((𝟭‘𝑂) “ (𝒫 𝑂 ∩ Fin)))
7		resres 5966	. . . 4 ⊢ (((𝟭‘𝑂) ↾ 𝒫 𝑂) ↾ Fin) = ((𝟭‘𝑂) ↾ (𝒫 𝑂 ∩ Fin))
8		f1ofn 6804	. . . . . 6 ⊢ ((𝟭‘𝑂):𝒫 𝑂–1-1-onto→({0, 1} ↑m 𝑂) → (𝟭‘𝑂) Fn 𝒫 𝑂)
9		fnresdm 6640	. . . . . 6 ⊢ ((𝟭‘𝑂) Fn 𝒫 𝑂 → ((𝟭‘𝑂) ↾ 𝒫 𝑂) = (𝟭‘𝑂))
10	1, 8, 9	3syl 18	. . . . 5 ⊢ (𝑂 ∈ 𝑉 → ((𝟭‘𝑂) ↾ 𝒫 𝑂) = (𝟭‘𝑂))
11	10	reseq1d 5952	. . . 4 ⊢ (𝑂 ∈ 𝑉 → (((𝟭‘𝑂) ↾ 𝒫 𝑂) ↾ Fin) = ((𝟭‘𝑂) ↾ Fin))
12	7, 11	eqtr3id 2779	. . 3 ⊢ (𝑂 ∈ 𝑉 → ((𝟭‘𝑂) ↾ (𝒫 𝑂 ∩ Fin)) = ((𝟭‘𝑂) ↾ Fin))
13		eqidd 2731	. . 3 ⊢ (𝑂 ∈ 𝑉 → (𝒫 𝑂 ∩ Fin) = (𝒫 𝑂 ∩ Fin))
14		simpll 766	. . . . . . . . 9 ⊢ (((𝑂 ∈ 𝑉 ∧ 𝑎 ∈ (𝒫 𝑂 ∩ Fin)) ∧ ((𝟭‘𝑂)‘𝑎) = 𝑔) → 𝑂 ∈ 𝑉)
15		simpr 484	. . . . . . . . . . . . . 14 ⊢ ((𝑂 ∈ 𝑉 ∧ 𝑎 ∈ (𝒫 𝑂 ∩ Fin)) → 𝑎 ∈ (𝒫 𝑂 ∩ Fin))
16	4, 15	sselid 3947	. . . . . . . . . . . . 13 ⊢ ((𝑂 ∈ 𝑉 ∧ 𝑎 ∈ (𝒫 𝑂 ∩ Fin)) → 𝑎 ∈ 𝒫 𝑂)
17	16	elpwid 4575	. . . . . . . . . . . 12 ⊢ ((𝑂 ∈ 𝑉 ∧ 𝑎 ∈ (𝒫 𝑂 ∩ Fin)) → 𝑎 ⊆ 𝑂)
18		indf 32785	. . . . . . . . . . . 12 ⊢ ((𝑂 ∈ 𝑉 ∧ 𝑎 ⊆ 𝑂) → ((𝟭‘𝑂)‘𝑎):𝑂⟶{0, 1})
19	17, 18	syldan 591	. . . . . . . . . . 11 ⊢ ((𝑂 ∈ 𝑉 ∧ 𝑎 ∈ (𝒫 𝑂 ∩ Fin)) → ((𝟭‘𝑂)‘𝑎):𝑂⟶{0, 1})
20	19	adantr 480	. . . . . . . . . 10 ⊢ (((𝑂 ∈ 𝑉 ∧ 𝑎 ∈ (𝒫 𝑂 ∩ Fin)) ∧ ((𝟭‘𝑂)‘𝑎) = 𝑔) → ((𝟭‘𝑂)‘𝑎):𝑂⟶{0, 1})
21		simpr 484	. . . . . . . . . . 11 ⊢ (((𝑂 ∈ 𝑉 ∧ 𝑎 ∈ (𝒫 𝑂 ∩ Fin)) ∧ ((𝟭‘𝑂)‘𝑎) = 𝑔) → ((𝟭‘𝑂)‘𝑎) = 𝑔)
22	21	feq1d 6673	. . . . . . . . . 10 ⊢ (((𝑂 ∈ 𝑉 ∧ 𝑎 ∈ (𝒫 𝑂 ∩ Fin)) ∧ ((𝟭‘𝑂)‘𝑎) = 𝑔) → (((𝟭‘𝑂)‘𝑎):𝑂⟶{0, 1} ↔ 𝑔:𝑂⟶{0, 1}))
23	20, 22	mpbid 232	. . . . . . . . 9 ⊢ (((𝑂 ∈ 𝑉 ∧ 𝑎 ∈ (𝒫 𝑂 ∩ Fin)) ∧ ((𝟭‘𝑂)‘𝑎) = 𝑔) → 𝑔:𝑂⟶{0, 1})
24		prex 5395	. . . . . . . . . . 11 ⊢ {0, 1} ∈ V
25		elmapg 8815	. . . . . . . . . . 11 ⊢ (({0, 1} ∈ V ∧ 𝑂 ∈ 𝑉) → (𝑔 ∈ ({0, 1} ↑m 𝑂) ↔ 𝑔:𝑂⟶{0, 1}))
26	24, 25	mpan 690	. . . . . . . . . 10 ⊢ (𝑂 ∈ 𝑉 → (𝑔 ∈ ({0, 1} ↑m 𝑂) ↔ 𝑔:𝑂⟶{0, 1}))
27	26	biimpar 477	. . . . . . . . 9 ⊢ ((𝑂 ∈ 𝑉 ∧ 𝑔:𝑂⟶{0, 1}) → 𝑔 ∈ ({0, 1} ↑m 𝑂))
28	14, 23, 27	syl2anc 584	. . . . . . . 8 ⊢ (((𝑂 ∈ 𝑉 ∧ 𝑎 ∈ (𝒫 𝑂 ∩ Fin)) ∧ ((𝟭‘𝑂)‘𝑎) = 𝑔) → 𝑔 ∈ ({0, 1} ↑m 𝑂))
29	21	cnveqd 5842	. . . . . . . . . 10 ⊢ (((𝑂 ∈ 𝑉 ∧ 𝑎 ∈ (𝒫 𝑂 ∩ Fin)) ∧ ((𝟭‘𝑂)‘𝑎) = 𝑔) → ◡((𝟭‘𝑂)‘𝑎) = ◡𝑔)
30	29	imaeq1d 6033	. . . . . . . . 9 ⊢ (((𝑂 ∈ 𝑉 ∧ 𝑎 ∈ (𝒫 𝑂 ∩ Fin)) ∧ ((𝟭‘𝑂)‘𝑎) = 𝑔) → (◡((𝟭‘𝑂)‘𝑎) “ {1}) = (◡𝑔 “ {1}))
31		indpi1 32790	. . . . . . . . . . . 12 ⊢ ((𝑂 ∈ 𝑉 ∧ 𝑎 ⊆ 𝑂) → (◡((𝟭‘𝑂)‘𝑎) “ {1}) = 𝑎)
32	17, 31	syldan 591	. . . . . . . . . . 11 ⊢ ((𝑂 ∈ 𝑉 ∧ 𝑎 ∈ (𝒫 𝑂 ∩ Fin)) → (◡((𝟭‘𝑂)‘𝑎) “ {1}) = 𝑎)
33		inss2 4204	. . . . . . . . . . . 12 ⊢ (𝒫 𝑂 ∩ Fin) ⊆ Fin
34	33, 15	sselid 3947	. . . . . . . . . . 11 ⊢ ((𝑂 ∈ 𝑉 ∧ 𝑎 ∈ (𝒫 𝑂 ∩ Fin)) → 𝑎 ∈ Fin)
35	32, 34	eqeltrd 2829	. . . . . . . . . 10 ⊢ ((𝑂 ∈ 𝑉 ∧ 𝑎 ∈ (𝒫 𝑂 ∩ Fin)) → (◡((𝟭‘𝑂)‘𝑎) “ {1}) ∈ Fin)
36	35	adantr 480	. . . . . . . . 9 ⊢ (((𝑂 ∈ 𝑉 ∧ 𝑎 ∈ (𝒫 𝑂 ∩ Fin)) ∧ ((𝟭‘𝑂)‘𝑎) = 𝑔) → (◡((𝟭‘𝑂)‘𝑎) “ {1}) ∈ Fin)
37	30, 36	eqeltrrd 2830	. . . . . . . 8 ⊢ (((𝑂 ∈ 𝑉 ∧ 𝑎 ∈ (𝒫 𝑂 ∩ Fin)) ∧ ((𝟭‘𝑂)‘𝑎) = 𝑔) → (◡𝑔 “ {1}) ∈ Fin)
38	28, 37	jca 511	. . . . . . 7 ⊢ (((𝑂 ∈ 𝑉 ∧ 𝑎 ∈ (𝒫 𝑂 ∩ Fin)) ∧ ((𝟭‘𝑂)‘𝑎) = 𝑔) → (𝑔 ∈ ({0, 1} ↑m 𝑂) ∧ (◡𝑔 “ {1}) ∈ Fin))
39	38	rexlimdva2 3137	. . . . . 6 ⊢ (𝑂 ∈ 𝑉 → (∃𝑎 ∈ (𝒫 𝑂 ∩ Fin)((𝟭‘𝑂)‘𝑎) = 𝑔 → (𝑔 ∈ ({0, 1} ↑m 𝑂) ∧ (◡𝑔 “ {1}) ∈ Fin)))
40		cnvimass 6056	. . . . . . . . . 10 ⊢ (◡𝑔 “ {1}) ⊆ dom 𝑔
41	26	biimpa 476	. . . . . . . . . . . 12 ⊢ ((𝑂 ∈ 𝑉 ∧ 𝑔 ∈ ({0, 1} ↑m 𝑂)) → 𝑔:𝑂⟶{0, 1})
42	41	fdmd 6701	. . . . . . . . . . 11 ⊢ ((𝑂 ∈ 𝑉 ∧ 𝑔 ∈ ({0, 1} ↑m 𝑂)) → dom 𝑔 = 𝑂)
43	42	adantrr 717	. . . . . . . . . 10 ⊢ ((𝑂 ∈ 𝑉 ∧ (𝑔 ∈ ({0, 1} ↑m 𝑂) ∧ (◡𝑔 “ {1}) ∈ Fin)) → dom 𝑔 = 𝑂)
44	40, 43	sseqtrid 3992	. . . . . . . . 9 ⊢ ((𝑂 ∈ 𝑉 ∧ (𝑔 ∈ ({0, 1} ↑m 𝑂) ∧ (◡𝑔 “ {1}) ∈ Fin)) → (◡𝑔 “ {1}) ⊆ 𝑂)
45		simprr 772	. . . . . . . . 9 ⊢ ((𝑂 ∈ 𝑉 ∧ (𝑔 ∈ ({0, 1} ↑m 𝑂) ∧ (◡𝑔 “ {1}) ∈ Fin)) → (◡𝑔 “ {1}) ∈ Fin)
46		elfpw 9312	. . . . . . . . 9 ⊢ ((◡𝑔 “ {1}) ∈ (𝒫 𝑂 ∩ Fin) ↔ ((◡𝑔 “ {1}) ⊆ 𝑂 ∧ (◡𝑔 “ {1}) ∈ Fin))
47	44, 45, 46	sylanbrc 583	. . . . . . . 8 ⊢ ((𝑂 ∈ 𝑉 ∧ (𝑔 ∈ ({0, 1} ↑m 𝑂) ∧ (◡𝑔 “ {1}) ∈ Fin)) → (◡𝑔 “ {1}) ∈ (𝒫 𝑂 ∩ Fin))
48		indpreima 32795	. . . . . . . . . . 11 ⊢ ((𝑂 ∈ 𝑉 ∧ 𝑔:𝑂⟶{0, 1}) → 𝑔 = ((𝟭‘𝑂)‘(◡𝑔 “ {1})))
49	48	eqcomd 2736	. . . . . . . . . 10 ⊢ ((𝑂 ∈ 𝑉 ∧ 𝑔:𝑂⟶{0, 1}) → ((𝟭‘𝑂)‘(◡𝑔 “ {1})) = 𝑔)
50	41, 49	syldan 591	. . . . . . . . 9 ⊢ ((𝑂 ∈ 𝑉 ∧ 𝑔 ∈ ({0, 1} ↑m 𝑂)) → ((𝟭‘𝑂)‘(◡𝑔 “ {1})) = 𝑔)
51	50	adantrr 717	. . . . . . . 8 ⊢ ((𝑂 ∈ 𝑉 ∧ (𝑔 ∈ ({0, 1} ↑m 𝑂) ∧ (◡𝑔 “ {1}) ∈ Fin)) → ((𝟭‘𝑂)‘(◡𝑔 “ {1})) = 𝑔)
52		fveqeq2 6870	. . . . . . . . 9 ⊢ (𝑎 = (◡𝑔 “ {1}) → (((𝟭‘𝑂)‘𝑎) = 𝑔 ↔ ((𝟭‘𝑂)‘(◡𝑔 “ {1})) = 𝑔))
53	52	rspcev 3591	. . . . . . . 8 ⊢ (((◡𝑔 “ {1}) ∈ (𝒫 𝑂 ∩ Fin) ∧ ((𝟭‘𝑂)‘(◡𝑔 “ {1})) = 𝑔) → ∃𝑎 ∈ (𝒫 𝑂 ∩ Fin)((𝟭‘𝑂)‘𝑎) = 𝑔)
54	47, 51, 53	syl2anc 584	. . . . . . 7 ⊢ ((𝑂 ∈ 𝑉 ∧ (𝑔 ∈ ({0, 1} ↑m 𝑂) ∧ (◡𝑔 “ {1}) ∈ Fin)) → ∃𝑎 ∈ (𝒫 𝑂 ∩ Fin)((𝟭‘𝑂)‘𝑎) = 𝑔)
55	54	ex 412	. . . . . 6 ⊢ (𝑂 ∈ 𝑉 → ((𝑔 ∈ ({0, 1} ↑m 𝑂) ∧ (◡𝑔 “ {1}) ∈ Fin) → ∃𝑎 ∈ (𝒫 𝑂 ∩ Fin)((𝟭‘𝑂)‘𝑎) = 𝑔))
56	39, 55	impbid 212	. . . . 5 ⊢ (𝑂 ∈ 𝑉 → (∃𝑎 ∈ (𝒫 𝑂 ∩ Fin)((𝟭‘𝑂)‘𝑎) = 𝑔 ↔ (𝑔 ∈ ({0, 1} ↑m 𝑂) ∧ (◡𝑔 “ {1}) ∈ Fin)))
57	1, 8	syl 17	. . . . . 6 ⊢ (𝑂 ∈ 𝑉 → (𝟭‘𝑂) Fn 𝒫 𝑂)
58		fvelimab 6936	. . . . . 6 ⊢ (((𝟭‘𝑂) Fn 𝒫 𝑂 ∧ (𝒫 𝑂 ∩ Fin) ⊆ 𝒫 𝑂) → (𝑔 ∈ ((𝟭‘𝑂) “ (𝒫 𝑂 ∩ Fin)) ↔ ∃𝑎 ∈ (𝒫 𝑂 ∩ Fin)((𝟭‘𝑂)‘𝑎) = 𝑔))
59	57, 4, 58	sylancl 586	. . . . 5 ⊢ (𝑂 ∈ 𝑉 → (𝑔 ∈ ((𝟭‘𝑂) “ (𝒫 𝑂 ∩ Fin)) ↔ ∃𝑎 ∈ (𝒫 𝑂 ∩ Fin)((𝟭‘𝑂)‘𝑎) = 𝑔))
60		cnveq 5840	. . . . . . . . 9 ⊢ (𝑓 = 𝑔 → ◡𝑓 = ◡𝑔)
61	60	imaeq1d 6033	. . . . . . . 8 ⊢ (𝑓 = 𝑔 → (◡𝑓 “ {1}) = (◡𝑔 “ {1}))
62	61	eleq1d 2814	. . . . . . 7 ⊢ (𝑓 = 𝑔 → ((◡𝑓 “ {1}) ∈ Fin ↔ (◡𝑔 “ {1}) ∈ Fin))
63	62	elrab 3662	. . . . . 6 ⊢ (𝑔 ∈ {𝑓 ∈ ({0, 1} ↑m 𝑂) ∣ (◡𝑓 “ {1}) ∈ Fin} ↔ (𝑔 ∈ ({0, 1} ↑m 𝑂) ∧ (◡𝑔 “ {1}) ∈ Fin))
64	63	a1i 11	. . . . 5 ⊢ (𝑂 ∈ 𝑉 → (𝑔 ∈ {𝑓 ∈ ({0, 1} ↑m 𝑂) ∣ (◡𝑓 “ {1}) ∈ Fin} ↔ (𝑔 ∈ ({0, 1} ↑m 𝑂) ∧ (◡𝑔 “ {1}) ∈ Fin)))
65	56, 59, 64	3bitr4d 311	. . . 4 ⊢ (𝑂 ∈ 𝑉 → (𝑔 ∈ ((𝟭‘𝑂) “ (𝒫 𝑂 ∩ Fin)) ↔ 𝑔 ∈ {𝑓 ∈ ({0, 1} ↑m 𝑂) ∣ (◡𝑓 “ {1}) ∈ Fin}))
66	65	eqrdv 2728	. . 3 ⊢ (𝑂 ∈ 𝑉 → ((𝟭‘𝑂) “ (𝒫 𝑂 ∩ Fin)) = {𝑓 ∈ ({0, 1} ↑m 𝑂) ∣ (◡𝑓 “ {1}) ∈ Fin})
67	12, 13, 66	f1oeq123d 6797	. 2 ⊢ (𝑂 ∈ 𝑉 → (((𝟭‘𝑂) ↾ (𝒫 𝑂 ∩ Fin)):(𝒫 𝑂 ∩ Fin)–1-1-onto→((𝟭‘𝑂) “ (𝒫 𝑂 ∩ Fin)) ↔ ((𝟭‘𝑂) ↾ Fin):(𝒫 𝑂 ∩ Fin)–1-1-onto→{𝑓 ∈ ({0, 1} ↑m 𝑂) ∣ (◡𝑓 “ {1}) ∈ Fin}))
68	6, 67	mpbid 232	1 ⊢ (𝑂 ∈ 𝑉 → ((𝟭‘𝑂) ↾ Fin):(𝒫 𝑂 ∩ Fin)–1-1-onto→{𝑓 ∈ ({0, 1} ↑m 𝑂) ∣ (◡𝑓 “ {1}) ∈ Fin})

Syntax hints:   → wi 4   ↔ wb 206   ∧ wa 395   = wceq 1540   ∈ wcel 2109  ∃wrex 3054  {crab 3408  Vcvv 3450   ∩ cin 3916   ⊆ wss 3917  𝒫 cpw 4566  {csn 4592  {cpr 4594  ^◡ccnv 5640  dom cdm 5641   ↾ cres 5643   “ cima 5644   Fn wfn 6509  ⟶wf 6510  –1-1→wf1 6511  –1-1-onto→wf1o 6513  ‘cfv 6514  (class class class)co 7390   ↑_m cmap 8802  Fincfn 8921  0cc0 11075  1c1 11076  𝟭cind 32780

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2702  ax-rep 5237  ax-sep 5254  ax-nul 5264  ax-pow 5323  ax-pr 5390  ax-un 7714  ax-1cn 11133  ax-icn 11134  ax-addcl 11135  ax-addrcl 11136  ax-mulcl 11137  ax-mulrcl 11138  ax-i2m1 11143  ax-1ne0 11144  ax-rnegex 11146  ax-rrecex 11147  ax-cnre 11148

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2534  df-eu 2563  df-clab 2709  df-cleq 2722  df-clel 2804  df-nfc 2879  df-ne 2927  df-ral 3046  df-rex 3055  df-reu 3357  df-rab 3409  df-v 3452  df-sbc 3757  df-csb 3866  df-dif 3920  df-un 3922  df-in 3924  df-ss 3934  df-nul 4300  df-if 4492  df-pw 4568  df-sn 4593  df-pr 4595  df-op 4599  df-uni 4875  df-iun 4960  df-br 5111  df-opab 5173  df-mpt 5192  df-id 5536  df-xp 5647  df-rel 5648  df-cnv 5649  df-co 5650  df-dm 5651  df-rn 5652  df-res 5653  df-ima 5654  df-iota 6467  df-fun 6516  df-fn 6517  df-f 6518  df-f1 6519  df-fo 6520  df-f1o 6521  df-fv 6522  df-ov 7393  df-oprab 7394  df-mpo 7395  df-map 8804  df-ind 32781

This theorem is referenced by:  eulerpartgbij  34370