Theorem restfpw 20793

Description: The restriction of the set of finite subsets of 𝐴 is the set of finite subsets of 𝐵. (Contributed by Mario Carneiro, 18-Sep-2015.)

Assertion

Ref	Expression
restfpw	⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → ((𝒫 𝐴 ∩ Fin) ↾t 𝐵) = (𝒫 𝐵 ∩ Fin))

Proof of Theorem restfpw

Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		pwexg 4776	. . . . . 6 ⊢ (𝐴 ∈ 𝑉 → 𝒫 𝐴 ∈ V)
2	1	adantr 480	. . . . 5 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → 𝒫 𝐴 ∈ V)
3		inex1g 4729	. . . . 5 ⊢ (𝒫 𝐴 ∈ V → (𝒫 𝐴 ∩ Fin) ∈ V)
4	2, 3	syl 17	. . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → (𝒫 𝐴 ∩ Fin) ∈ V)
5		ssexg 4732	. . . . 5 ⊢ ((𝐵 ⊆ 𝐴 ∧ 𝐴 ∈ 𝑉) → 𝐵 ∈ V)
6	5	ancoms 468	. . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → 𝐵 ∈ V)
7		restval 15910	. . . 4 ⊢ (((𝒫 𝐴 ∩ Fin) ∈ V ∧ 𝐵 ∈ V) → ((𝒫 𝐴 ∩ Fin) ↾t 𝐵) = ran (𝑥 ∈ (𝒫 𝐴 ∩ Fin) ↦ (𝑥 ∩ 𝐵)))
8	4, 6, 7	syl2anc 691	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → ((𝒫 𝐴 ∩ Fin) ↾t 𝐵) = ran (𝑥 ∈ (𝒫 𝐴 ∩ Fin) ↦ (𝑥 ∩ 𝐵)))
9		inss2 3796	. . . . . . 7 ⊢ (𝑥 ∩ 𝐵) ⊆ 𝐵
10	9	a1i 11	. . . . . 6 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐴 ∩ Fin)) → (𝑥 ∩ 𝐵) ⊆ 𝐵)
11		elfpw 8151	. . . . . . . . 9 ⊢ (𝑥 ∈ (𝒫 𝐴 ∩ Fin) ↔ (𝑥 ⊆ 𝐴 ∧ 𝑥 ∈ Fin))
12	11	simprbi 479	. . . . . . . 8 ⊢ (𝑥 ∈ (𝒫 𝐴 ∩ Fin) → 𝑥 ∈ Fin)
13	12	adantl 481	. . . . . . 7 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐴 ∩ Fin)) → 𝑥 ∈ Fin)
14		inss1 3795	. . . . . . 7 ⊢ (𝑥 ∩ 𝐵) ⊆ 𝑥
15		ssfi 8065	. . . . . . 7 ⊢ ((𝑥 ∈ Fin ∧ (𝑥 ∩ 𝐵) ⊆ 𝑥) → (𝑥 ∩ 𝐵) ∈ Fin)
16	13, 14, 15	sylancl 693	. . . . . 6 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐴 ∩ Fin)) → (𝑥 ∩ 𝐵) ∈ Fin)
17		elfpw 8151	. . . . . 6 ⊢ ((𝑥 ∩ 𝐵) ∈ (𝒫 𝐵 ∩ Fin) ↔ ((𝑥 ∩ 𝐵) ⊆ 𝐵 ∧ (𝑥 ∩ 𝐵) ∈ Fin))
18	10, 16, 17	sylanbrc 695	. . . . 5 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐴 ∩ Fin)) → (𝑥 ∩ 𝐵) ∈ (𝒫 𝐵 ∩ Fin))
19		eqid 2610	. . . . 5 ⊢ (𝑥 ∈ (𝒫 𝐴 ∩ Fin) ↦ (𝑥 ∩ 𝐵)) = (𝑥 ∈ (𝒫 𝐴 ∩ Fin) ↦ (𝑥 ∩ 𝐵))
20	18, 19	fmptd 6292	. . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → (𝑥 ∈ (𝒫 𝐴 ∩ Fin) ↦ (𝑥 ∩ 𝐵)):(𝒫 𝐴 ∩ Fin)⟶(𝒫 𝐵 ∩ Fin))
21		frn 5966	. . . 4 ⊢ ((𝑥 ∈ (𝒫 𝐴 ∩ Fin) ↦ (𝑥 ∩ 𝐵)):(𝒫 𝐴 ∩ Fin)⟶(𝒫 𝐵 ∩ Fin) → ran (𝑥 ∈ (𝒫 𝐴 ∩ Fin) ↦ (𝑥 ∩ 𝐵)) ⊆ (𝒫 𝐵 ∩ Fin))
22	20, 21	syl 17	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → ran (𝑥 ∈ (𝒫 𝐴 ∩ Fin) ↦ (𝑥 ∩ 𝐵)) ⊆ (𝒫 𝐵 ∩ Fin))
23	8, 22	eqsstrd 3602	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → ((𝒫 𝐴 ∩ Fin) ↾t 𝐵) ⊆ (𝒫 𝐵 ∩ Fin))
24		elfpw 8151	. . . . . . . 8 ⊢ (𝑥 ∈ (𝒫 𝐵 ∩ Fin) ↔ (𝑥 ⊆ 𝐵 ∧ 𝑥 ∈ Fin))
25	24	simplbi 475	. . . . . . 7 ⊢ (𝑥 ∈ (𝒫 𝐵 ∩ Fin) → 𝑥 ⊆ 𝐵)
26	25	adantl 481	. . . . . 6 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → 𝑥 ⊆ 𝐵)
27		df-ss 3554	. . . . . 6 ⊢ (𝑥 ⊆ 𝐵 ↔ (𝑥 ∩ 𝐵) = 𝑥)
28	26, 27	sylib 207	. . . . 5 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → (𝑥 ∩ 𝐵) = 𝑥)
29	4	adantr 480	. . . . . 6 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → (𝒫 𝐴 ∩ Fin) ∈ V)
30	6	adantr 480	. . . . . 6 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → 𝐵 ∈ V)
31		simplr 788	. . . . . . . 8 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → 𝐵 ⊆ 𝐴)
32	26, 31	sstrd 3578	. . . . . . 7 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → 𝑥 ⊆ 𝐴)
33	24	simprbi 479	. . . . . . . 8 ⊢ (𝑥 ∈ (𝒫 𝐵 ∩ Fin) → 𝑥 ∈ Fin)
34	33	adantl 481	. . . . . . 7 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → 𝑥 ∈ Fin)
35	32, 34, 11	sylanbrc 695	. . . . . 6 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → 𝑥 ∈ (𝒫 𝐴 ∩ Fin))
36		elrestr 15912	. . . . . 6 ⊢ (((𝒫 𝐴 ∩ Fin) ∈ V ∧ 𝐵 ∈ V ∧ 𝑥 ∈ (𝒫 𝐴 ∩ Fin)) → (𝑥 ∩ 𝐵) ∈ ((𝒫 𝐴 ∩ Fin) ↾t 𝐵))
37	29, 30, 35, 36	syl3anc 1318	. . . . 5 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → (𝑥 ∩ 𝐵) ∈ ((𝒫 𝐴 ∩ Fin) ↾t 𝐵))
38	28, 37	eqeltrrd 2689	. . . 4 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → 𝑥 ∈ ((𝒫 𝐴 ∩ Fin) ↾t 𝐵))
39	38	ex 449	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → (𝑥 ∈ (𝒫 𝐵 ∩ Fin) → 𝑥 ∈ ((𝒫 𝐴 ∩ Fin) ↾t 𝐵)))
40	39	ssrdv 3574	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → (𝒫 𝐵 ∩ Fin) ⊆ ((𝒫 𝐴 ∩ Fin) ↾t 𝐵))
41	23, 40	eqssd 3585	1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → ((𝒫 𝐴 ∩ Fin) ↾t 𝐵) = (𝒫 𝐵 ∩ Fin))

Syntax hints:   → wi 4   ∧ wa 383   = wceq 1475   ∈ wcel 1977  Vcvv 3173   ∩ cin 3539   ⊆ wss 3540  𝒫 cpw 4108   ↦ cmpt 4643  ran crn 5039  ⟶wf 5800  (class class class)co 6549  Fincfn 7841   ↾_t crest 15904

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-reu 2903  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-er 7629  df-en 7842  df-fin 7845  df-rest 15906

This theorem is referenced by: (None)