Theorem f1opwfi 9402

Description: A one-to-one mapping induces a one-to-one mapping on finite subsets. (Contributed by Mario Carneiro, 25-Jan-2015.)

Assertion

Ref	Expression
f1opwfi	⊢ (𝐹:𝐴–1-1-onto→𝐵 → (𝑏 ∈ (𝒫 𝐴 ∩ Fin) ↦ (𝐹 “ 𝑏)):(𝒫 𝐴 ∩ Fin)–1-1-onto→(𝒫 𝐵 ∩ Fin))

Distinct variable groups:   𝐴,𝑏   𝐵,𝑏   𝐹,𝑏

Proof of Theorem f1opwfi

Dummy variable 𝑎 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		eqid 2726	. 2 ⊢ (𝑏 ∈ (𝒫 𝐴 ∩ Fin) ↦ (𝐹 “ 𝑏)) = (𝑏 ∈ (𝒫 𝐴 ∩ Fin) ↦ (𝐹 “ 𝑏))
2		simpr 483	. . . . . 6 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑏 ∈ (𝒫 𝐴 ∩ Fin)) → 𝑏 ∈ (𝒫 𝐴 ∩ Fin))
3	2	elin2d 4200	. . . . 5 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑏 ∈ (𝒫 𝐴 ∩ Fin)) → 𝑏 ∈ Fin)
4		f1ofun 6847	. . . . . 6 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → Fun 𝐹)
5		elinel1 4196	. . . . . . . . 9 ⊢ (𝑏 ∈ (𝒫 𝐴 ∩ Fin) → 𝑏 ∈ 𝒫 𝐴)
6		elpwi 4614	. . . . . . . . 9 ⊢ (𝑏 ∈ 𝒫 𝐴 → 𝑏 ⊆ 𝐴)
7	5, 6	syl 17	. . . . . . . 8 ⊢ (𝑏 ∈ (𝒫 𝐴 ∩ Fin) → 𝑏 ⊆ 𝐴)
8	7	adantl 480	. . . . . . 7 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑏 ∈ (𝒫 𝐴 ∩ Fin)) → 𝑏 ⊆ 𝐴)
9		f1odm 6849	. . . . . . . 8 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → dom 𝐹 = 𝐴)
10	9	adantr 479	. . . . . . 7 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑏 ∈ (𝒫 𝐴 ∩ Fin)) → dom 𝐹 = 𝐴)
11	8, 10	sseqtrrd 4021	. . . . . 6 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑏 ∈ (𝒫 𝐴 ∩ Fin)) → 𝑏 ⊆ dom 𝐹)
12		fores 6827	. . . . . 6 ⊢ ((Fun 𝐹 ∧ 𝑏 ⊆ dom 𝐹) → (𝐹 ↾ 𝑏):𝑏–onto→(𝐹 “ 𝑏))
13	4, 11, 12	syl2an2r 683	. . . . 5 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑏 ∈ (𝒫 𝐴 ∩ Fin)) → (𝐹 ↾ 𝑏):𝑏–onto→(𝐹 “ 𝑏))
14		fofi 9355	. . . . 5 ⊢ ((𝑏 ∈ Fin ∧ (𝐹 ↾ 𝑏):𝑏–onto→(𝐹 “ 𝑏)) → (𝐹 “ 𝑏) ∈ Fin)
15	3, 13, 14	syl2anc 582	. . . 4 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑏 ∈ (𝒫 𝐴 ∩ Fin)) → (𝐹 “ 𝑏) ∈ Fin)
16		imassrn 6082	. . . . . 6 ⊢ (𝐹 “ 𝑏) ⊆ ran 𝐹
17		f1ofo 6852	. . . . . . 7 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → 𝐹:𝐴–onto→𝐵)
18		forn 6820	. . . . . . 7 ⊢ (𝐹:𝐴–onto→𝐵 → ran 𝐹 = 𝐵)
19	17, 18	syl 17	. . . . . 6 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → ran 𝐹 = 𝐵)
20	16, 19	sseqtrid 4032	. . . . 5 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → (𝐹 “ 𝑏) ⊆ 𝐵)
21	20	adantr 479	. . . 4 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑏 ∈ (𝒫 𝐴 ∩ Fin)) → (𝐹 “ 𝑏) ⊆ 𝐵)
22	15, 21	elpwd 4613	. . 3 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑏 ∈ (𝒫 𝐴 ∩ Fin)) → (𝐹 “ 𝑏) ∈ 𝒫 𝐵)
23	22, 15	elind 4195	. 2 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑏 ∈ (𝒫 𝐴 ∩ Fin)) → (𝐹 “ 𝑏) ∈ (𝒫 𝐵 ∩ Fin))
24		simpr 483	. . . . . 6 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin)) → 𝑎 ∈ (𝒫 𝐵 ∩ Fin))
25	24	elin2d 4200	. . . . 5 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin)) → 𝑎 ∈ Fin)
26		dff1o3 6851	. . . . . . 7 ⊢ (𝐹:𝐴–1-1-onto→𝐵 ↔ (𝐹:𝐴–onto→𝐵 ∧ Fun ◡𝐹))
27	26	simprbi 495	. . . . . 6 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → Fun ◡𝐹)
28		elinel1 4196	. . . . . . . . 9 ⊢ (𝑎 ∈ (𝒫 𝐵 ∩ Fin) → 𝑎 ∈ 𝒫 𝐵)
29	28	adantl 480	. . . . . . . 8 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin)) → 𝑎 ∈ 𝒫 𝐵)
30		elpwi 4614	. . . . . . . 8 ⊢ (𝑎 ∈ 𝒫 𝐵 → 𝑎 ⊆ 𝐵)
31	29, 30	syl 17	. . . . . . 7 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin)) → 𝑎 ⊆ 𝐵)
32		f1ocnv 6857	. . . . . . . . 9 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → ◡𝐹:𝐵–1-1-onto→𝐴)
33	32	adantr 479	. . . . . . . 8 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin)) → ◡𝐹:𝐵–1-1-onto→𝐴)
34		f1odm 6849	. . . . . . . 8 ⊢ (◡𝐹:𝐵–1-1-onto→𝐴 → dom ◡𝐹 = 𝐵)
35	33, 34	syl 17	. . . . . . 7 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin)) → dom ◡𝐹 = 𝐵)
36	31, 35	sseqtrrd 4021	. . . . . 6 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin)) → 𝑎 ⊆ dom ◡𝐹)
37		fores 6827	. . . . . 6 ⊢ ((Fun ◡𝐹 ∧ 𝑎 ⊆ dom ◡𝐹) → (◡𝐹 ↾ 𝑎):𝑎–onto→(◡𝐹 “ 𝑎))
38	27, 36, 37	syl2an2r 683	. . . . 5 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin)) → (◡𝐹 ↾ 𝑎):𝑎–onto→(◡𝐹 “ 𝑎))
39		fofi 9355	. . . . 5 ⊢ ((𝑎 ∈ Fin ∧ (◡𝐹 ↾ 𝑎):𝑎–onto→(◡𝐹 “ 𝑎)) → (◡𝐹 “ 𝑎) ∈ Fin)
40	25, 38, 39	syl2anc 582	. . . 4 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin)) → (◡𝐹 “ 𝑎) ∈ Fin)
41		imassrn 6082	. . . . . 6 ⊢ (◡𝐹 “ 𝑎) ⊆ ran ◡𝐹
42		dfdm4 5904	. . . . . . 7 ⊢ dom 𝐹 = ran ◡𝐹
43	42, 9	eqtr3id 2780	. . . . . 6 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → ran ◡𝐹 = 𝐴)
44	41, 43	sseqtrid 4032	. . . . 5 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → (◡𝐹 “ 𝑎) ⊆ 𝐴)
45	44	adantr 479	. . . 4 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin)) → (◡𝐹 “ 𝑎) ⊆ 𝐴)
46	40, 45	elpwd 4613	. . 3 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin)) → (◡𝐹 “ 𝑎) ∈ 𝒫 𝐴)
47	46, 40	elind 4195	. 2 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin)) → (◡𝐹 “ 𝑎) ∈ (𝒫 𝐴 ∩ Fin))
48	5, 28	anim12i 611	. . 3 ⊢ ((𝑏 ∈ (𝒫 𝐴 ∩ Fin) ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin)) → (𝑏 ∈ 𝒫 𝐴 ∧ 𝑎 ∈ 𝒫 𝐵))
49	30	adantl 480	. . . . . . 7 ⊢ ((𝑏 ∈ 𝒫 𝐴 ∧ 𝑎 ∈ 𝒫 𝐵) → 𝑎 ⊆ 𝐵)
50		foimacnv 6862	. . . . . . 7 ⊢ ((𝐹:𝐴–onto→𝐵 ∧ 𝑎 ⊆ 𝐵) → (𝐹 “ (◡𝐹 “ 𝑎)) = 𝑎)
51	17, 49, 50	syl2an 594	. . . . . 6 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ (𝑏 ∈ 𝒫 𝐴 ∧ 𝑎 ∈ 𝒫 𝐵)) → (𝐹 “ (◡𝐹 “ 𝑎)) = 𝑎)
52	51	eqcomd 2732	. . . . 5 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ (𝑏 ∈ 𝒫 𝐴 ∧ 𝑎 ∈ 𝒫 𝐵)) → 𝑎 = (𝐹 “ (◡𝐹 “ 𝑎)))
53		imaeq2 6067	. . . . . 6 ⊢ (𝑏 = (◡𝐹 “ 𝑎) → (𝐹 “ 𝑏) = (𝐹 “ (◡𝐹 “ 𝑎)))
54	53	eqeq2d 2737	. . . . 5 ⊢ (𝑏 = (◡𝐹 “ 𝑎) → (𝑎 = (𝐹 “ 𝑏) ↔ 𝑎 = (𝐹 “ (◡𝐹 “ 𝑎))))
55	52, 54	syl5ibrcom 246	. . . 4 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ (𝑏 ∈ 𝒫 𝐴 ∧ 𝑎 ∈ 𝒫 𝐵)) → (𝑏 = (◡𝐹 “ 𝑎) → 𝑎 = (𝐹 “ 𝑏)))
56		f1of1 6844	. . . . . . 7 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → 𝐹:𝐴–1-1→𝐵)
57	6	adantr 479	. . . . . . 7 ⊢ ((𝑏 ∈ 𝒫 𝐴 ∧ 𝑎 ∈ 𝒫 𝐵) → 𝑏 ⊆ 𝐴)
58		f1imacnv 6861	. . . . . . 7 ⊢ ((𝐹:𝐴–1-1→𝐵 ∧ 𝑏 ⊆ 𝐴) → (◡𝐹 “ (𝐹 “ 𝑏)) = 𝑏)
59	56, 57, 58	syl2an 594	. . . . . 6 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ (𝑏 ∈ 𝒫 𝐴 ∧ 𝑎 ∈ 𝒫 𝐵)) → (◡𝐹 “ (𝐹 “ 𝑏)) = 𝑏)
60	59	eqcomd 2732	. . . . 5 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ (𝑏 ∈ 𝒫 𝐴 ∧ 𝑎 ∈ 𝒫 𝐵)) → 𝑏 = (◡𝐹 “ (𝐹 “ 𝑏)))
61		imaeq2 6067	. . . . . 6 ⊢ (𝑎 = (𝐹 “ 𝑏) → (◡𝐹 “ 𝑎) = (◡𝐹 “ (𝐹 “ 𝑏)))
62	61	eqeq2d 2737	. . . . 5 ⊢ (𝑎 = (𝐹 “ 𝑏) → (𝑏 = (◡𝐹 “ 𝑎) ↔ 𝑏 = (◡𝐹 “ (𝐹 “ 𝑏))))
63	60, 62	syl5ibrcom 246	. . . 4 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ (𝑏 ∈ 𝒫 𝐴 ∧ 𝑎 ∈ 𝒫 𝐵)) → (𝑎 = (𝐹 “ 𝑏) → 𝑏 = (◡𝐹 “ 𝑎)))
64	55, 63	impbid 211	. . 3 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ (𝑏 ∈ 𝒫 𝐴 ∧ 𝑎 ∈ 𝒫 𝐵)) → (𝑏 = (◡𝐹 “ 𝑎) ↔ 𝑎 = (𝐹 “ 𝑏)))
65	48, 64	sylan2 591	. 2 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ (𝑏 ∈ (𝒫 𝐴 ∩ Fin) ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin))) → (𝑏 = (◡𝐹 “ 𝑎) ↔ 𝑎 = (𝐹 “ 𝑏)))
66	1, 23, 47, 65	f1o2d 7682	1 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → (𝑏 ∈ (𝒫 𝐴 ∩ Fin) ↦ (𝐹 “ 𝑏)):(𝒫 𝐴 ∩ Fin)–1-1-onto→(𝒫 𝐵 ∩ Fin))

Syntax hints:   → wi 4   ↔ wb 205   ∧ wa 394   = wceq 1534   ∈ wcel 2099   ∩ cin 3946   ⊆ wss 3947  𝒫 cpw 4607   ↦ cmpt 5238  ^◡ccnv 5683  dom cdm 5684  ran crn 5685   ↾ cres 5686   “ cima 5687  Fun wfun 6550  –1-1→wf1 6553  –onto→wfo 6554  –1-1-onto→wf1o 6555  Fincfn 8976

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1790  ax-4 1804  ax-5 1906  ax-6 1964  ax-7 2004  ax-8 2101  ax-9 2109  ax-10 2130  ax-11 2147  ax-12 2167  ax-ext 2697  ax-sep 5306  ax-nul 5313  ax-pr 5435  ax-un 7748

This theorem depends on definitions:  df-bi 206  df-an 395  df-or 846  df-3or 1085  df-3an 1086  df-tru 1537  df-fal 1547  df-ex 1775  df-nf 1779  df-sb 2061  df-mo 2529  df-eu 2558  df-clab 2704  df-cleq 2718  df-clel 2803  df-nfc 2878  df-ne 2931  df-ral 3052  df-rex 3061  df-reu 3365  df-rab 3420  df-v 3464  df-sbc 3777  df-dif 3950  df-un 3952  df-in 3954  df-ss 3964  df-pss 3967  df-nul 4326  df-if 4534  df-pw 4609  df-sn 4634  df-pr 4636  df-op 4640  df-uni 4916  df-br 5156  df-opab 5218  df-mpt 5239  df-tr 5273  df-id 5582  df-eprel 5588  df-po 5596  df-so 5597  df-fr 5639  df-we 5641  df-xp 5690  df-rel 5691  df-cnv 5692  df-co 5693  df-dm 5694  df-rn 5695  df-res 5696  df-ima 5697  df-ord 6381  df-on 6382  df-lim 6383  df-suc 6384  df-iota 6508  df-fun 6558  df-fn 6559  df-f 6560  df-f1 6561  df-fo 6562  df-f1o 6563  df-fv 6564  df-om 7879  df-1o 8498  df-en 8977  df-dom 8978  df-fin 8980

This theorem is referenced by:  fictb  10290  ackbijnn  15834  tsmsf1o  24143  eulerpartgbij  34208