Theorem f1opwfi 9394

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 2735	. 2 ⊢ (𝑏 ∈ (𝒫 𝐴 ∩ Fin) ↦ (𝐹 “ 𝑏)) = (𝑏 ∈ (𝒫 𝐴 ∩ Fin) ↦ (𝐹 “ 𝑏))
2		simpr 484	. . . . . 6 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑏 ∈ (𝒫 𝐴 ∩ Fin)) → 𝑏 ∈ (𝒫 𝐴 ∩ Fin))
3	2	elin2d 4215	. . . . 5 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑏 ∈ (𝒫 𝐴 ∩ Fin)) → 𝑏 ∈ Fin)
4		f1ofun 6851	. . . . . 6 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → Fun 𝐹)
5		elinel1 4211	. . . . . . . . 9 ⊢ (𝑏 ∈ (𝒫 𝐴 ∩ Fin) → 𝑏 ∈ 𝒫 𝐴)
6		elpwi 4612	. . . . . . . . 9 ⊢ (𝑏 ∈ 𝒫 𝐴 → 𝑏 ⊆ 𝐴)
7	5, 6	syl 17	. . . . . . . 8 ⊢ (𝑏 ∈ (𝒫 𝐴 ∩ Fin) → 𝑏 ⊆ 𝐴)
8	7	adantl 481	. . . . . . 7 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑏 ∈ (𝒫 𝐴 ∩ Fin)) → 𝑏 ⊆ 𝐴)
9		f1odm 6853	. . . . . . . 8 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → dom 𝐹 = 𝐴)
10	9	adantr 480	. . . . . . 7 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑏 ∈ (𝒫 𝐴 ∩ Fin)) → dom 𝐹 = 𝐴)
11	8, 10	sseqtrrd 4037	. . . . . 6 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑏 ∈ (𝒫 𝐴 ∩ Fin)) → 𝑏 ⊆ dom 𝐹)
12		fores 6831	. . . . . 6 ⊢ ((Fun 𝐹 ∧ 𝑏 ⊆ dom 𝐹) → (𝐹 ↾ 𝑏):𝑏–onto→(𝐹 “ 𝑏))
13	4, 11, 12	syl2an2r 685	. . . . 5 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑏 ∈ (𝒫 𝐴 ∩ Fin)) → (𝐹 ↾ 𝑏):𝑏–onto→(𝐹 “ 𝑏))
14		fofi 9349	. . . . 5 ⊢ ((𝑏 ∈ Fin ∧ (𝐹 ↾ 𝑏):𝑏–onto→(𝐹 “ 𝑏)) → (𝐹 “ 𝑏) ∈ Fin)
15	3, 13, 14	syl2anc 584	. . . 4 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑏 ∈ (𝒫 𝐴 ∩ Fin)) → (𝐹 “ 𝑏) ∈ Fin)
16		imassrn 6091	. . . . . 6 ⊢ (𝐹 “ 𝑏) ⊆ ran 𝐹
17		f1ofo 6856	. . . . . . 7 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → 𝐹:𝐴–onto→𝐵)
18		forn 6824	. . . . . . 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 4048	. . . . 5 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → (𝐹 “ 𝑏) ⊆ 𝐵)
21	20	adantr 480	. . . 4 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑏 ∈ (𝒫 𝐴 ∩ Fin)) → (𝐹 “ 𝑏) ⊆ 𝐵)
22	15, 21	elpwd 4611	. . 3 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑏 ∈ (𝒫 𝐴 ∩ Fin)) → (𝐹 “ 𝑏) ∈ 𝒫 𝐵)
23	22, 15	elind 4210	. 2 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑏 ∈ (𝒫 𝐴 ∩ Fin)) → (𝐹 “ 𝑏) ∈ (𝒫 𝐵 ∩ Fin))
24		simpr 484	. . . . . 6 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin)) → 𝑎 ∈ (𝒫 𝐵 ∩ Fin))
25	24	elin2d 4215	. . . . 5 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin)) → 𝑎 ∈ Fin)
26		dff1o3 6855	. . . . . . 7 ⊢ (𝐹:𝐴–1-1-onto→𝐵 ↔ (𝐹:𝐴–onto→𝐵 ∧ Fun ◡𝐹))
27	26	simprbi 496	. . . . . 6 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → Fun ◡𝐹)
28		elinel1 4211	. . . . . . . . 9 ⊢ (𝑎 ∈ (𝒫 𝐵 ∩ Fin) → 𝑎 ∈ 𝒫 𝐵)
29	28	adantl 481	. . . . . . . 8 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin)) → 𝑎 ∈ 𝒫 𝐵)
30		elpwi 4612	. . . . . . . 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 6861	. . . . . . . . 9 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → ◡𝐹:𝐵–1-1-onto→𝐴)
33	32	adantr 480	. . . . . . . 8 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin)) → ◡𝐹:𝐵–1-1-onto→𝐴)
34		f1odm 6853	. . . . . . . 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 4037	. . . . . 6 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin)) → 𝑎 ⊆ dom ◡𝐹)
37		fores 6831	. . . . . 6 ⊢ ((Fun ◡𝐹 ∧ 𝑎 ⊆ dom ◡𝐹) → (◡𝐹 ↾ 𝑎):𝑎–onto→(◡𝐹 “ 𝑎))
38	27, 36, 37	syl2an2r 685	. . . . 5 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin)) → (◡𝐹 ↾ 𝑎):𝑎–onto→(◡𝐹 “ 𝑎))
39		fofi 9349	. . . . 5 ⊢ ((𝑎 ∈ Fin ∧ (◡𝐹 ↾ 𝑎):𝑎–onto→(◡𝐹 “ 𝑎)) → (◡𝐹 “ 𝑎) ∈ Fin)
40	25, 38, 39	syl2anc 584	. . . 4 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin)) → (◡𝐹 “ 𝑎) ∈ Fin)
41		imassrn 6091	. . . . . 6 ⊢ (◡𝐹 “ 𝑎) ⊆ ran ◡𝐹
42		dfdm4 5909	. . . . . . 7 ⊢ dom 𝐹 = ran ◡𝐹
43	42, 9	eqtr3id 2789	. . . . . 6 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → ran ◡𝐹 = 𝐴)
44	41, 43	sseqtrid 4048	. . . . 5 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → (◡𝐹 “ 𝑎) ⊆ 𝐴)
45	44	adantr 480	. . . 4 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin)) → (◡𝐹 “ 𝑎) ⊆ 𝐴)
46	40, 45	elpwd 4611	. . 3 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin)) → (◡𝐹 “ 𝑎) ∈ 𝒫 𝐴)
47	46, 40	elind 4210	. 2 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin)) → (◡𝐹 “ 𝑎) ∈ (𝒫 𝐴 ∩ Fin))
48	5, 28	anim12i 613	. . 3 ⊢ ((𝑏 ∈ (𝒫 𝐴 ∩ Fin) ∧ 𝑎 ∈ (𝒫 𝐵 ∩ Fin)) → (𝑏 ∈ 𝒫 𝐴 ∧ 𝑎 ∈ 𝒫 𝐵))
49	30	adantl 481	. . . . . . 7 ⊢ ((𝑏 ∈ 𝒫 𝐴 ∧ 𝑎 ∈ 𝒫 𝐵) → 𝑎 ⊆ 𝐵)
50		foimacnv 6866	. . . . . . 7 ⊢ ((𝐹:𝐴–onto→𝐵 ∧ 𝑎 ⊆ 𝐵) → (𝐹 “ (◡𝐹 “ 𝑎)) = 𝑎)
51	17, 49, 50	syl2an 596	. . . . . 6 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ (𝑏 ∈ 𝒫 𝐴 ∧ 𝑎 ∈ 𝒫 𝐵)) → (𝐹 “ (◡𝐹 “ 𝑎)) = 𝑎)
52	51	eqcomd 2741	. . . . 5 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ (𝑏 ∈ 𝒫 𝐴 ∧ 𝑎 ∈ 𝒫 𝐵)) → 𝑎 = (𝐹 “ (◡𝐹 “ 𝑎)))
53		imaeq2 6076	. . . . . 6 ⊢ (𝑏 = (◡𝐹 “ 𝑎) → (𝐹 “ 𝑏) = (𝐹 “ (◡𝐹 “ 𝑎)))
54	53	eqeq2d 2746	. . . . 5 ⊢ (𝑏 = (◡𝐹 “ 𝑎) → (𝑎 = (𝐹 “ 𝑏) ↔ 𝑎 = (𝐹 “ (◡𝐹 “ 𝑎))))
55	52, 54	syl5ibrcom 247	. . . 4 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ (𝑏 ∈ 𝒫 𝐴 ∧ 𝑎 ∈ 𝒫 𝐵)) → (𝑏 = (◡𝐹 “ 𝑎) → 𝑎 = (𝐹 “ 𝑏)))
56		f1of1 6848	. . . . . . 7 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → 𝐹:𝐴–1-1→𝐵)
57	6	adantr 480	. . . . . . 7 ⊢ ((𝑏 ∈ 𝒫 𝐴 ∧ 𝑎 ∈ 𝒫 𝐵) → 𝑏 ⊆ 𝐴)
58		f1imacnv 6865	. . . . . . 7 ⊢ ((𝐹:𝐴–1-1→𝐵 ∧ 𝑏 ⊆ 𝐴) → (◡𝐹 “ (𝐹 “ 𝑏)) = 𝑏)
59	56, 57, 58	syl2an 596	. . . . . 6 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ (𝑏 ∈ 𝒫 𝐴 ∧ 𝑎 ∈ 𝒫 𝐵)) → (◡𝐹 “ (𝐹 “ 𝑏)) = 𝑏)
60	59	eqcomd 2741	. . . . 5 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ (𝑏 ∈ 𝒫 𝐴 ∧ 𝑎 ∈ 𝒫 𝐵)) → 𝑏 = (◡𝐹 “ (𝐹 “ 𝑏)))
61		imaeq2 6076	. . . . . 6 ⊢ (𝑎 = (𝐹 “ 𝑏) → (◡𝐹 “ 𝑎) = (◡𝐹 “ (𝐹 “ 𝑏)))
62	61	eqeq2d 2746	. . . . 5 ⊢ (𝑎 = (𝐹 “ 𝑏) → (𝑏 = (◡𝐹 “ 𝑎) ↔ 𝑏 = (◡𝐹 “ (𝐹 “ 𝑏))))
63	60, 62	syl5ibrcom 247	. . . 4 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ (𝑏 ∈ 𝒫 𝐴 ∧ 𝑎 ∈ 𝒫 𝐵)) → (𝑎 = (𝐹 “ 𝑏) → 𝑏 = (◡𝐹 “ 𝑎)))
64	55, 63	impbid 212	. . 3 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ (𝑏 ∈ 𝒫 𝐴 ∧ 𝑎 ∈ 𝒫 𝐵)) → (𝑏 = (◡𝐹 “ 𝑎) ↔ 𝑎 = (𝐹 “ 𝑏)))
65	48, 64	sylan2 593	. 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 7687	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 206   ∧ wa 395   = wceq 1537   ∈ wcel 2106   ∩ cin 3962   ⊆ wss 3963  𝒫 cpw 4605   ↦ cmpt 5231  ^◡ccnv 5688  dom cdm 5689  ran crn 5690   ↾ cres 5691   “ cima 5692  Fun wfun 6557  –1-1→wf1 6560  –onto→wfo 6561  –1-1-onto→wf1o 6562  Fincfn 8984

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 1908  ax-6 1965  ax-7 2005  ax-8 2108  ax-9 2116  ax-10 2139  ax-11 2155  ax-12 2175  ax-ext 2706  ax-sep 5302  ax-nul 5312  ax-pr 5438  ax-un 7754

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1540  df-fal 1550  df-ex 1777  df-nf 1781  df-sb 2063  df-mo 2538  df-eu 2567  df-clab 2713  df-cleq 2727  df-clel 2814  df-nfc 2890  df-ne 2939  df-ral 3060  df-rex 3069  df-reu 3379  df-rab 3434  df-v 3480  df-sbc 3792  df-dif 3966  df-un 3968  df-in 3970  df-ss 3980  df-pss 3983  df-nul 4340  df-if 4532  df-pw 4607  df-sn 4632  df-pr 4634  df-op 4638  df-uni 4913  df-br 5149  df-opab 5211  df-mpt 5232  df-tr 5266  df-id 5583  df-eprel 5589  df-po 5597  df-so 5598  df-fr 5641  df-we 5643  df-xp 5695  df-rel 5696  df-cnv 5697  df-co 5698  df-dm 5699  df-rn 5700  df-res 5701  df-ima 5702  df-ord 6389  df-on 6390  df-lim 6391  df-suc 6392  df-iota 6516  df-fun 6565  df-fn 6566  df-f 6567  df-f1 6568  df-fo 6569  df-f1o 6570  df-fv 6571  df-om 7888  df-1o 8505  df-en 8985  df-dom 8986  df-fin 8988

This theorem is referenced by:  fictb  10282  ackbijnn  15861  tsmsf1o  24169  eulerpartgbij  34354