Theorem restfpw 23187

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 5378	. . . . . 6 ⊢ (𝐴 ∈ 𝑉 → 𝒫 𝐴 ∈ V)
2	1	adantr 480	. . . . 5 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → 𝒫 𝐴 ∈ V)
3		inex1g 5319	. . . . 5 ⊢ (𝒫 𝐴 ∈ V → (𝒫 𝐴 ∩ Fin) ∈ V)
4	2, 3	syl 17	. . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → (𝒫 𝐴 ∩ Fin) ∈ V)
5		ssexg 5323	. . . . 5 ⊢ ((𝐵 ⊆ 𝐴 ∧ 𝐴 ∈ 𝑉) → 𝐵 ∈ V)
6	5	ancoms 458	. . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → 𝐵 ∈ V)
7		restval 17471	. . . 4 ⊢ (((𝒫 𝐴 ∩ Fin) ∈ V ∧ 𝐵 ∈ V) → ((𝒫 𝐴 ∩ Fin) ↾t 𝐵) = ran (𝑥 ∈ (𝒫 𝐴 ∩ Fin) ↦ (𝑥 ∩ 𝐵)))
8	4, 6, 7	syl2anc 584	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → ((𝒫 𝐴 ∩ Fin) ↾t 𝐵) = ran (𝑥 ∈ (𝒫 𝐴 ∩ Fin) ↦ (𝑥 ∩ 𝐵)))
9		inss2 4238	. . . . . . 7 ⊢ (𝑥 ∩ 𝐵) ⊆ 𝐵
10	9	a1i 11	. . . . . 6 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐴 ∩ Fin)) → (𝑥 ∩ 𝐵) ⊆ 𝐵)
11		elinel2 4202	. . . . . . . 8 ⊢ (𝑥 ∈ (𝒫 𝐴 ∩ Fin) → 𝑥 ∈ Fin)
12	11	adantl 481	. . . . . . 7 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐴 ∩ Fin)) → 𝑥 ∈ Fin)
13		inss1 4237	. . . . . . 7 ⊢ (𝑥 ∩ 𝐵) ⊆ 𝑥
14		ssfi 9213	. . . . . . 7 ⊢ ((𝑥 ∈ Fin ∧ (𝑥 ∩ 𝐵) ⊆ 𝑥) → (𝑥 ∩ 𝐵) ∈ Fin)
15	12, 13, 14	sylancl 586	. . . . . 6 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐴 ∩ Fin)) → (𝑥 ∩ 𝐵) ∈ Fin)
16		elfpw 9394	. . . . . 6 ⊢ ((𝑥 ∩ 𝐵) ∈ (𝒫 𝐵 ∩ Fin) ↔ ((𝑥 ∩ 𝐵) ⊆ 𝐵 ∧ (𝑥 ∩ 𝐵) ∈ Fin))
17	10, 15, 16	sylanbrc 583	. . . . 5 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐴 ∩ Fin)) → (𝑥 ∩ 𝐵) ∈ (𝒫 𝐵 ∩ Fin))
18	17	fmpttd 7135	. . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → (𝑥 ∈ (𝒫 𝐴 ∩ Fin) ↦ (𝑥 ∩ 𝐵)):(𝒫 𝐴 ∩ Fin)⟶(𝒫 𝐵 ∩ Fin))
19	18	frnd 6744	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → ran (𝑥 ∈ (𝒫 𝐴 ∩ Fin) ↦ (𝑥 ∩ 𝐵)) ⊆ (𝒫 𝐵 ∩ Fin))
20	8, 19	eqsstrd 4018	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → ((𝒫 𝐴 ∩ Fin) ↾t 𝐵) ⊆ (𝒫 𝐵 ∩ Fin))
21		elfpw 9394	. . . . . 6 ⊢ (𝑥 ∈ (𝒫 𝐵 ∩ Fin) ↔ (𝑥 ⊆ 𝐵 ∧ 𝑥 ∈ Fin))
22	21	simplbi 497	. . . . 5 ⊢ (𝑥 ∈ (𝒫 𝐵 ∩ Fin) → 𝑥 ⊆ 𝐵)
23	22	adantl 481	. . . 4 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → 𝑥 ⊆ 𝐵)
24		dfss2 3969	. . . 4 ⊢ (𝑥 ⊆ 𝐵 ↔ (𝑥 ∩ 𝐵) = 𝑥)
25	23, 24	sylib 218	. . 3 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → (𝑥 ∩ 𝐵) = 𝑥)
26	4	adantr 480	. . . 4 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → (𝒫 𝐴 ∩ Fin) ∈ V)
27	6	adantr 480	. . . 4 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → 𝐵 ∈ V)
28		simplr 769	. . . . . 6 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → 𝐵 ⊆ 𝐴)
29	23, 28	sstrd 3994	. . . . 5 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → 𝑥 ⊆ 𝐴)
30		elinel2 4202	. . . . . 6 ⊢ (𝑥 ∈ (𝒫 𝐵 ∩ Fin) → 𝑥 ∈ Fin)
31	30	adantl 481	. . . . 5 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → 𝑥 ∈ Fin)
32		elfpw 9394	. . . . 5 ⊢ (𝑥 ∈ (𝒫 𝐴 ∩ Fin) ↔ (𝑥 ⊆ 𝐴 ∧ 𝑥 ∈ Fin))
33	29, 31, 32	sylanbrc 583	. . . 4 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → 𝑥 ∈ (𝒫 𝐴 ∩ Fin))
34		elrestr 17473	. . . 4 ⊢ (((𝒫 𝐴 ∩ Fin) ∈ V ∧ 𝐵 ∈ V ∧ 𝑥 ∈ (𝒫 𝐴 ∩ Fin)) → (𝑥 ∩ 𝐵) ∈ ((𝒫 𝐴 ∩ Fin) ↾t 𝐵))
35	26, 27, 33, 34	syl3anc 1373	. . 3 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → (𝑥 ∩ 𝐵) ∈ ((𝒫 𝐴 ∩ Fin) ↾t 𝐵))
36	25, 35	eqeltrrd 2842	. 2 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → 𝑥 ∈ ((𝒫 𝐴 ∩ Fin) ↾t 𝐵))
37	20, 36	eqelssd 4005	1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → ((𝒫 𝐴 ∩ Fin) ↾t 𝐵) = (𝒫 𝐵 ∩ Fin))

Syntax hints:   → wi 4   ∧ wa 395   = wceq 1540   ∈ wcel 2108  Vcvv 3480   ∩ cin 3950   ⊆ wss 3951  𝒫 cpw 4600   ↦ cmpt 5225  ran crn 5686  (class class class)co 7431  Fincfn 8985   ↾_t crest 17465

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 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2157  ax-12 2177  ax-ext 2708  ax-rep 5279  ax-sep 5296  ax-nul 5306  ax-pow 5365  ax-pr 5432  ax-un 7755

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3or 1088  df-3an 1089  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2065  df-mo 2540  df-eu 2569  df-clab 2715  df-cleq 2729  df-clel 2816  df-nfc 2892  df-ne 2941  df-ral 3062  df-rex 3071  df-reu 3381  df-rab 3437  df-v 3482  df-sbc 3789  df-csb 3900  df-dif 3954  df-un 3956  df-in 3958  df-ss 3968  df-pss 3971  df-nul 4334  df-if 4526  df-pw 4602  df-sn 4627  df-pr 4629  df-op 4633  df-uni 4908  df-iun 4993  df-br 5144  df-opab 5206  df-mpt 5226  df-tr 5260  df-id 5578  df-eprel 5584  df-po 5592  df-so 5593  df-fr 5637  df-we 5639  df-xp 5691  df-rel 5692  df-cnv 5693  df-co 5694  df-dm 5695  df-rn 5696  df-res 5697  df-ima 5698  df-ord 6387  df-on 6388  df-lim 6389  df-suc 6390  df-iota 6514  df-fun 6563  df-fn 6564  df-f 6565  df-f1 6566  df-fo 6567  df-f1o 6568  df-fv 6569  df-ov 7434  df-oprab 7435  df-mpo 7436  df-om 7888  df-1o 8506  df-en 8986  df-fin 8989  df-rest 17467

This theorem is referenced by: (None)