Theorem pwfi2f1o 40837

Description: The pw2f1o 8817 bijection relates finitely supported indicator functions on a two-element set to finite subsets. MOVABLE (Contributed by Stefan O'Rear, 10-Jul-2015.) (Revised by AV, 14-Jun-2020.)

Hypotheses

Ref	Expression
pwfi2f1o.s	⊢ 𝑆 = {𝑦 ∈ (2o ↑m 𝐴) ∣ 𝑦 finSupp ∅}
pwfi2f1o.f	⊢ 𝐹 = (𝑥 ∈ 𝑆 ↦ (◡𝑥 “ {1o}))

Assertion

Ref	Expression
pwfi2f1o	⊢ (𝐴 ∈ 𝑉 → 𝐹:𝑆–1-1-onto→(𝒫 𝐴 ∩ Fin))

Distinct variable groups:   𝑥,𝑦,𝐴   𝑥,𝑆   𝑥,𝑉,𝑦

Allowed substitution hints:   𝑆(𝑦)   𝐹(𝑥,𝑦)

Proof of Theorem pwfi2f1o

Step	Hyp	Ref	Expression
1		eqid 2738	. . . . 5 ⊢ (𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) = (𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o}))
2	1	pw2f1o2 40776	. . . 4 ⊢ (𝐴 ∈ 𝑉 → (𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})):(2o ↑m 𝐴)–1-1-onto→𝒫 𝐴)
3		f1of1 6699	. . . 4 ⊢ ((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})):(2o ↑m 𝐴)–1-1-onto→𝒫 𝐴 → (𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})):(2o ↑m 𝐴)–1-1→𝒫 𝐴)
4	2, 3	syl 17	. . 3 ⊢ (𝐴 ∈ 𝑉 → (𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})):(2o ↑m 𝐴)–1-1→𝒫 𝐴)
5		pwfi2f1o.s	. . . 4 ⊢ 𝑆 = {𝑦 ∈ (2o ↑m 𝐴) ∣ 𝑦 finSupp ∅}
6		ssrab2 4009	. . . 4 ⊢ {𝑦 ∈ (2o ↑m 𝐴) ∣ 𝑦 finSupp ∅} ⊆ (2o ↑m 𝐴)
7	5, 6	eqsstri 3951	. . 3 ⊢ 𝑆 ⊆ (2o ↑m 𝐴)
8		f1ores 6714	. . 3 ⊢ (((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})):(2o ↑m 𝐴)–1-1→𝒫 𝐴 ∧ 𝑆 ⊆ (2o ↑m 𝐴)) → ((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) ↾ 𝑆):𝑆–1-1-onto→((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) “ 𝑆))
9	4, 7, 8	sylancl 585	. 2 ⊢ (𝐴 ∈ 𝑉 → ((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) ↾ 𝑆):𝑆–1-1-onto→((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) “ 𝑆))
10		elmapfun 8612	. . . . . . . . . . . . 13 ⊢ (𝑦 ∈ (2o ↑m 𝐴) → Fun 𝑦)
11		id 22	. . . . . . . . . . . . 13 ⊢ (𝑦 ∈ (2o ↑m 𝐴) → 𝑦 ∈ (2o ↑m 𝐴))
12		0ex 5226	. . . . . . . . . . . . . 14 ⊢ ∅ ∈ V
13	12	a1i 11	. . . . . . . . . . . . 13 ⊢ (𝑦 ∈ (2o ↑m 𝐴) → ∅ ∈ V)
14	10, 11, 13	3jca 1126	. . . . . . . . . . . 12 ⊢ (𝑦 ∈ (2o ↑m 𝐴) → (Fun 𝑦 ∧ 𝑦 ∈ (2o ↑m 𝐴) ∧ ∅ ∈ V))
15	14	adantl 481	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑦 ∈ (2o ↑m 𝐴)) → (Fun 𝑦 ∧ 𝑦 ∈ (2o ↑m 𝐴) ∧ ∅ ∈ V))
16		funisfsupp 9063	. . . . . . . . . . 11 ⊢ ((Fun 𝑦 ∧ 𝑦 ∈ (2o ↑m 𝐴) ∧ ∅ ∈ V) → (𝑦 finSupp ∅ ↔ (𝑦 supp ∅) ∈ Fin))
17	15, 16	syl 17	. . . . . . . . . 10 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑦 ∈ (2o ↑m 𝐴)) → (𝑦 finSupp ∅ ↔ (𝑦 supp ∅) ∈ Fin))
18	13	anim2i 616	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑦 ∈ (2o ↑m 𝐴)) → (𝐴 ∈ 𝑉 ∧ ∅ ∈ V))
19		elmapi 8595	. . . . . . . . . . . . . 14 ⊢ (𝑦 ∈ (2o ↑m 𝐴) → 𝑦:𝐴⟶2o)
20	19	adantl 481	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑦 ∈ (2o ↑m 𝐴)) → 𝑦:𝐴⟶2o)
21		frnsuppeq 7962	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ 𝑉 ∧ ∅ ∈ V) → (𝑦:𝐴⟶2o → (𝑦 supp ∅) = (◡𝑦 “ (2o ∖ {∅}))))
22	18, 20, 21	sylc 65	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑦 ∈ (2o ↑m 𝐴)) → (𝑦 supp ∅) = (◡𝑦 “ (2o ∖ {∅})))
23		df-2o 8268	. . . . . . . . . . . . . . . 16 ⊢ 2o = suc 1o
24		df-suc 6257	. . . . . . . . . . . . . . . . 17 ⊢ suc 1o = (1o ∪ {1o})
25	24	equncomi 4085	. . . . . . . . . . . . . . . 16 ⊢ suc 1o = ({1o} ∪ 1o)
26	23, 25	eqtri 2766	. . . . . . . . . . . . . . 15 ⊢ 2o = ({1o} ∪ 1o)
27		df1o2 8279	. . . . . . . . . . . . . . . 16 ⊢ 1o = {∅}
28	27	eqcomi 2747	. . . . . . . . . . . . . . 15 ⊢ {∅} = 1o
29	26, 28	difeq12i 4051	. . . . . . . . . . . . . 14 ⊢ (2o ∖ {∅}) = (({1o} ∪ 1o) ∖ 1o)
30		difun2 4411	. . . . . . . . . . . . . . 15 ⊢ (({1o} ∪ 1o) ∖ 1o) = ({1o} ∖ 1o)
31		incom 4131	. . . . . . . . . . . . . . . . 17 ⊢ ({1o} ∩ 1o) = (1o ∩ {1o})
32		1on 8274	. . . . . . . . . . . . . . . . . . 19 ⊢ 1o ∈ On
33	32	onordi 6356	. . . . . . . . . . . . . . . . . 18 ⊢ Ord 1o
34		orddisj 6289	. . . . . . . . . . . . . . . . . 18 ⊢ (Ord 1o → (1o ∩ {1o}) = ∅)
35	33, 34	ax-mp 5	. . . . . . . . . . . . . . . . 17 ⊢ (1o ∩ {1o}) = ∅
36	31, 35	eqtri 2766	. . . . . . . . . . . . . . . 16 ⊢ ({1o} ∩ 1o) = ∅
37		disj3 4384	. . . . . . . . . . . . . . . 16 ⊢ (({1o} ∩ 1o) = ∅ ↔ {1o} = ({1o} ∖ 1o))
38	36, 37	mpbi 229	. . . . . . . . . . . . . . 15 ⊢ {1o} = ({1o} ∖ 1o)
39	30, 38	eqtr4i 2769	. . . . . . . . . . . . . 14 ⊢ (({1o} ∪ 1o) ∖ 1o) = {1o}
40	29, 39	eqtri 2766	. . . . . . . . . . . . 13 ⊢ (2o ∖ {∅}) = {1o}
41	40	imaeq2i 5956	. . . . . . . . . . . 12 ⊢ (◡𝑦 “ (2o ∖ {∅})) = (◡𝑦 “ {1o})
42	22, 41	eqtrdi 2795	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑦 ∈ (2o ↑m 𝐴)) → (𝑦 supp ∅) = (◡𝑦 “ {1o}))
43	42	eleq1d 2823	. . . . . . . . . 10 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑦 ∈ (2o ↑m 𝐴)) → ((𝑦 supp ∅) ∈ Fin ↔ (◡𝑦 “ {1o}) ∈ Fin))
44		cnvimass 5978	. . . . . . . . . . . 12 ⊢ (◡𝑦 “ {1o}) ⊆ dom 𝑦
45	44, 20	fssdm 6604	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑦 ∈ (2o ↑m 𝐴)) → (◡𝑦 “ {1o}) ⊆ 𝐴)
46	45	biantrurd 532	. . . . . . . . . 10 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑦 ∈ (2o ↑m 𝐴)) → ((◡𝑦 “ {1o}) ∈ Fin ↔ ((◡𝑦 “ {1o}) ⊆ 𝐴 ∧ (◡𝑦 “ {1o}) ∈ Fin)))
47	17, 43, 46	3bitrd 304	. . . . . . . . 9 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑦 ∈ (2o ↑m 𝐴)) → (𝑦 finSupp ∅ ↔ ((◡𝑦 “ {1o}) ⊆ 𝐴 ∧ (◡𝑦 “ {1o}) ∈ Fin)))
48		elfpw 9051	. . . . . . . . 9 ⊢ ((◡𝑦 “ {1o}) ∈ (𝒫 𝐴 ∩ Fin) ↔ ((◡𝑦 “ {1o}) ⊆ 𝐴 ∧ (◡𝑦 “ {1o}) ∈ Fin))
49	47, 48	bitr4di 288	. . . . . . . 8 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑦 ∈ (2o ↑m 𝐴)) → (𝑦 finSupp ∅ ↔ (◡𝑦 “ {1o}) ∈ (𝒫 𝐴 ∩ Fin)))
50	49	rabbidva 3402	. . . . . . 7 ⊢ (𝐴 ∈ 𝑉 → {𝑦 ∈ (2o ↑m 𝐴) ∣ 𝑦 finSupp ∅} = {𝑦 ∈ (2o ↑m 𝐴) ∣ (◡𝑦 “ {1o}) ∈ (𝒫 𝐴 ∩ Fin)})
51		cnveq 5771	. . . . . . . . . 10 ⊢ (𝑥 = 𝑦 → ◡𝑥 = ◡𝑦)
52	51	imaeq1d 5957	. . . . . . . . 9 ⊢ (𝑥 = 𝑦 → (◡𝑥 “ {1o}) = (◡𝑦 “ {1o}))
53	52	cbvmptv 5183	. . . . . . . 8 ⊢ (𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) = (𝑦 ∈ (2o ↑m 𝐴) ↦ (◡𝑦 “ {1o}))
54	53	mptpreima 6130	. . . . . . 7 ⊢ (◡(𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) “ (𝒫 𝐴 ∩ Fin)) = {𝑦 ∈ (2o ↑m 𝐴) ∣ (◡𝑦 “ {1o}) ∈ (𝒫 𝐴 ∩ Fin)}
55	50, 5, 54	3eqtr4g 2804	. . . . . 6 ⊢ (𝐴 ∈ 𝑉 → 𝑆 = (◡(𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) “ (𝒫 𝐴 ∩ Fin)))
56	55	imaeq2d 5958	. . . . 5 ⊢ (𝐴 ∈ 𝑉 → ((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) “ 𝑆) = ((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) “ (◡(𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) “ (𝒫 𝐴 ∩ Fin))))
57		f1ofo 6707	. . . . . . 7 ⊢ ((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})):(2o ↑m 𝐴)–1-1-onto→𝒫 𝐴 → (𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})):(2o ↑m 𝐴)–onto→𝒫 𝐴)
58	2, 57	syl 17	. . . . . 6 ⊢ (𝐴 ∈ 𝑉 → (𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})):(2o ↑m 𝐴)–onto→𝒫 𝐴)
59		inss1 4159	. . . . . 6 ⊢ (𝒫 𝐴 ∩ Fin) ⊆ 𝒫 𝐴
60		foimacnv 6717	. . . . . 6 ⊢ (((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})):(2o ↑m 𝐴)–onto→𝒫 𝐴 ∧ (𝒫 𝐴 ∩ Fin) ⊆ 𝒫 𝐴) → ((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) “ (◡(𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) “ (𝒫 𝐴 ∩ Fin))) = (𝒫 𝐴 ∩ Fin))
61	58, 59, 60	sylancl 585	. . . . 5 ⊢ (𝐴 ∈ 𝑉 → ((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) “ (◡(𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) “ (𝒫 𝐴 ∩ Fin))) = (𝒫 𝐴 ∩ Fin))
62	56, 61	eqtrd 2778	. . . 4 ⊢ (𝐴 ∈ 𝑉 → ((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) “ 𝑆) = (𝒫 𝐴 ∩ Fin))
63		f1oeq3 6690	. . . 4 ⊢ (((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) “ 𝑆) = (𝒫 𝐴 ∩ Fin) → (((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) ↾ 𝑆):𝑆–1-1-onto→((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) “ 𝑆) ↔ ((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) ↾ 𝑆):𝑆–1-1-onto→(𝒫 𝐴 ∩ Fin)))
64	62, 63	syl 17	. . 3 ⊢ (𝐴 ∈ 𝑉 → (((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) ↾ 𝑆):𝑆–1-1-onto→((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) “ 𝑆) ↔ ((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) ↾ 𝑆):𝑆–1-1-onto→(𝒫 𝐴 ∩ Fin)))
65		resmpt 5934	. . . . . 6 ⊢ (𝑆 ⊆ (2o ↑m 𝐴) → ((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) ↾ 𝑆) = (𝑥 ∈ 𝑆 ↦ (◡𝑥 “ {1o})))
66	7, 65	ax-mp 5	. . . . 5 ⊢ ((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) ↾ 𝑆) = (𝑥 ∈ 𝑆 ↦ (◡𝑥 “ {1o}))
67		pwfi2f1o.f	. . . . 5 ⊢ 𝐹 = (𝑥 ∈ 𝑆 ↦ (◡𝑥 “ {1o}))
68	66, 67	eqtr4i 2769	. . . 4 ⊢ ((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) ↾ 𝑆) = 𝐹
69		f1oeq1 6688	. . . 4 ⊢ (((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) ↾ 𝑆) = 𝐹 → (((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) ↾ 𝑆):𝑆–1-1-onto→(𝒫 𝐴 ∩ Fin) ↔ 𝐹:𝑆–1-1-onto→(𝒫 𝐴 ∩ Fin)))
70	68, 69	mp1i 13	. . 3 ⊢ (𝐴 ∈ 𝑉 → (((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) ↾ 𝑆):𝑆–1-1-onto→(𝒫 𝐴 ∩ Fin) ↔ 𝐹:𝑆–1-1-onto→(𝒫 𝐴 ∩ Fin)))
71	64, 70	bitrd 278	. 2 ⊢ (𝐴 ∈ 𝑉 → (((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) ↾ 𝑆):𝑆–1-1-onto→((𝑥 ∈ (2o ↑m 𝐴) ↦ (◡𝑥 “ {1o})) “ 𝑆) ↔ 𝐹:𝑆–1-1-onto→(𝒫 𝐴 ∩ Fin)))
72	9, 71	mpbid 231	1 ⊢ (𝐴 ∈ 𝑉 → 𝐹:𝑆–1-1-onto→(𝒫 𝐴 ∩ Fin))

Syntax hints:   → wi 4   ↔ wb 205   ∧ wa 395   ∧ w3a 1085   = wceq 1539   ∈ wcel 2108  {crab 3067  Vcvv 3422   ∖ cdif 3880   ∪ cun 3881   ∩ cin 3882   ⊆ wss 3883  ∅c0 4253  𝒫 cpw 4530  {csn 4558   class class class wbr 5070   ↦ cmpt 5153  ^◡ccnv 5579   ↾ cres 5582   “ cima 5583  Ord word 6250  suc csuc 6253  Fun wfun 6412  ⟶wf 6414  –1-1→wf1 6415  –onto→wfo 6416  –1-1-onto→wf1o 6417  (class class class)co 7255   supp csupp 7948  1_oc1o 8260  2_oc2o 8261   ↑_m cmap 8573  Fincfn 8691   finSupp cfsupp 9058

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2110  ax-9 2118  ax-10 2139  ax-11 2156  ax-12 2173  ax-ext 2709  ax-rep 5205  ax-sep 5218  ax-nul 5225  ax-pow 5283  ax-pr 5347  ax-un 7566

This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3or 1086  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1784  df-nf 1788  df-sb 2069  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2817  df-nfc 2888  df-ne 2943  df-ral 3068  df-rex 3069  df-reu 3070  df-rab 3072  df-v 3424  df-sbc 3712  df-csb 3829  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-pss 3902  df-nul 4254  df-if 4457  df-pw 4532  df-sn 4559  df-pr 4561  df-tp 4563  df-op 4565  df-uni 4837  df-iun 4923  df-br 5071  df-opab 5133  df-mpt 5154  df-tr 5188  df-id 5480  df-eprel 5486  df-po 5494  df-so 5495  df-fr 5535  df-we 5537  df-xp 5586  df-rel 5587  df-cnv 5588  df-co 5589  df-dm 5590  df-rn 5591  df-res 5592  df-ima 5593  df-ord 6254  df-on 6255  df-suc 6257  df-iota 6376  df-fun 6420  df-fn 6421  df-f 6422  df-f1 6423  df-fo 6424  df-f1o 6425  df-fv 6426  df-ov 7258  df-oprab 7259  df-mpo 7260  df-1st 7804  df-2nd 7805  df-supp 7949  df-1o 8267  df-2o 8268  df-map 8575  df-fsupp 9059

This theorem is referenced by:  pwfi2en  40838