Theorem restfpw 21781

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 5271	. . . . . 6 ⊢ (𝐴 ∈ 𝑉 → 𝒫 𝐴 ∈ V)
2	1	adantr 483	. . . . 5 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → 𝒫 𝐴 ∈ V)
3		inex1g 5215	. . . . 5 ⊢ (𝒫 𝐴 ∈ V → (𝒫 𝐴 ∩ Fin) ∈ V)
4	2, 3	syl 17	. . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → (𝒫 𝐴 ∩ Fin) ∈ V)
5		ssexg 5219	. . . . 5 ⊢ ((𝐵 ⊆ 𝐴 ∧ 𝐴 ∈ 𝑉) → 𝐵 ∈ V)
6	5	ancoms 461	. . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → 𝐵 ∈ V)
7		restval 16694	. . . 4 ⊢ (((𝒫 𝐴 ∩ Fin) ∈ V ∧ 𝐵 ∈ V) → ((𝒫 𝐴 ∩ Fin) ↾t 𝐵) = ran (𝑥 ∈ (𝒫 𝐴 ∩ Fin) ↦ (𝑥 ∩ 𝐵)))
8	4, 6, 7	syl2anc 586	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → ((𝒫 𝐴 ∩ Fin) ↾t 𝐵) = ran (𝑥 ∈ (𝒫 𝐴 ∩ Fin) ↦ (𝑥 ∩ 𝐵)))
9		inss2 4205	. . . . . . 7 ⊢ (𝑥 ∩ 𝐵) ⊆ 𝐵
10	9	a1i 11	. . . . . 6 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐴 ∩ Fin)) → (𝑥 ∩ 𝐵) ⊆ 𝐵)
11		elinel2 4172	. . . . . . . 8 ⊢ (𝑥 ∈ (𝒫 𝐴 ∩ Fin) → 𝑥 ∈ Fin)
12	11	adantl 484	. . . . . . 7 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐴 ∩ Fin)) → 𝑥 ∈ Fin)
13		inss1 4204	. . . . . . 7 ⊢ (𝑥 ∩ 𝐵) ⊆ 𝑥
14		ssfi 8732	. . . . . . 7 ⊢ ((𝑥 ∈ Fin ∧ (𝑥 ∩ 𝐵) ⊆ 𝑥) → (𝑥 ∩ 𝐵) ∈ Fin)
15	12, 13, 14	sylancl 588	. . . . . 6 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐴 ∩ Fin)) → (𝑥 ∩ 𝐵) ∈ Fin)
16		elfpw 8820	. . . . . 6 ⊢ ((𝑥 ∩ 𝐵) ∈ (𝒫 𝐵 ∩ Fin) ↔ ((𝑥 ∩ 𝐵) ⊆ 𝐵 ∧ (𝑥 ∩ 𝐵) ∈ Fin))
17	10, 15, 16	sylanbrc 585	. . . . 5 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐴 ∩ Fin)) → (𝑥 ∩ 𝐵) ∈ (𝒫 𝐵 ∩ Fin))
18	17	fmpttd 6873	. . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → (𝑥 ∈ (𝒫 𝐴 ∩ Fin) ↦ (𝑥 ∩ 𝐵)):(𝒫 𝐴 ∩ Fin)⟶(𝒫 𝐵 ∩ Fin))
19	18	frnd 6515	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → ran (𝑥 ∈ (𝒫 𝐴 ∩ Fin) ↦ (𝑥 ∩ 𝐵)) ⊆ (𝒫 𝐵 ∩ Fin))
20	8, 19	eqsstrd 4004	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → ((𝒫 𝐴 ∩ Fin) ↾t 𝐵) ⊆ (𝒫 𝐵 ∩ Fin))
21		elfpw 8820	. . . . . 6 ⊢ (𝑥 ∈ (𝒫 𝐵 ∩ Fin) ↔ (𝑥 ⊆ 𝐵 ∧ 𝑥 ∈ Fin))
22	21	simplbi 500	. . . . 5 ⊢ (𝑥 ∈ (𝒫 𝐵 ∩ Fin) → 𝑥 ⊆ 𝐵)
23	22	adantl 484	. . . 4 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → 𝑥 ⊆ 𝐵)
24		df-ss 3951	. . . 4 ⊢ (𝑥 ⊆ 𝐵 ↔ (𝑥 ∩ 𝐵) = 𝑥)
25	23, 24	sylib 220	. . 3 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → (𝑥 ∩ 𝐵) = 𝑥)
26	4	adantr 483	. . . 4 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → (𝒫 𝐴 ∩ Fin) ∈ V)
27	6	adantr 483	. . . 4 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → 𝐵 ∈ V)
28		simplr 767	. . . . . 6 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → 𝐵 ⊆ 𝐴)
29	23, 28	sstrd 3976	. . . . 5 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → 𝑥 ⊆ 𝐴)
30		elinel2 4172	. . . . . 6 ⊢ (𝑥 ∈ (𝒫 𝐵 ∩ Fin) → 𝑥 ∈ Fin)
31	30	adantl 484	. . . . 5 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → 𝑥 ∈ Fin)
32		elfpw 8820	. . . . 5 ⊢ (𝑥 ∈ (𝒫 𝐴 ∩ Fin) ↔ (𝑥 ⊆ 𝐴 ∧ 𝑥 ∈ Fin))
33	29, 31, 32	sylanbrc 585	. . . 4 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → 𝑥 ∈ (𝒫 𝐴 ∩ Fin))
34		elrestr 16696	. . . 4 ⊢ (((𝒫 𝐴 ∩ Fin) ∈ V ∧ 𝐵 ∈ V ∧ 𝑥 ∈ (𝒫 𝐴 ∩ Fin)) → (𝑥 ∩ 𝐵) ∈ ((𝒫 𝐴 ∩ Fin) ↾t 𝐵))
35	26, 27, 33, 34	syl3anc 1367	. . 3 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → (𝑥 ∩ 𝐵) ∈ ((𝒫 𝐴 ∩ Fin) ↾t 𝐵))
36	25, 35	eqeltrrd 2914	. 2 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) ∧ 𝑥 ∈ (𝒫 𝐵 ∩ Fin)) → 𝑥 ∈ ((𝒫 𝐴 ∩ Fin) ↾t 𝐵))
37	20, 36	eqelssd 3987	1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐴) → ((𝒫 𝐴 ∩ Fin) ↾t 𝐵) = (𝒫 𝐵 ∩ Fin))

Syntax hints:   → wi 4   ∧ wa 398   = wceq 1533   ∈ wcel 2110  Vcvv 3494   ∩ cin 3934   ⊆ wss 3935  𝒫 cpw 4538   ↦ cmpt 5138  ran crn 5550  (class class class)co 7150  Fincfn 8503   ↾_t crest 16688

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2157  ax-12 2173  ax-ext 2793  ax-rep 5182  ax-sep 5195  ax-nul 5202  ax-pow 5258  ax-pr 5321  ax-un 7455

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1536  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-ral 3143  df-rex 3144  df-reu 3145  df-rab 3147  df-v 3496  df-sbc 3772  df-csb 3883  df-dif 3938  df-un 3940  df-in 3942  df-ss 3951  df-pss 3953  df-nul 4291  df-if 4467  df-pw 4540  df-sn 4561  df-pr 4563  df-tp 4565  df-op 4567  df-uni 4832  df-iun 4913  df-br 5059  df-opab 5121  df-mpt 5139  df-tr 5165  df-id 5454  df-eprel 5459  df-po 5468  df-so 5469  df-fr 5508  df-we 5510  df-xp 5555  df-rel 5556  df-cnv 5557  df-co 5558  df-dm 5559  df-rn 5560  df-res 5561  df-ima 5562  df-ord 6188  df-on 6189  df-lim 6190  df-suc 6191  df-iota 6308  df-fun 6351  df-fn 6352  df-f 6353  df-f1 6354  df-fo 6355  df-f1o 6356  df-fv 6357  df-ov 7153  df-oprab 7154  df-mpo 7155  df-om 7575  df-er 8283  df-en 8504  df-fin 8507  df-rest 16690

This theorem is referenced by: (None)