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Theorem f1dmvrnfibi 8802
Description: A one-to-one function whose domain is a set is finite if and only if its range is finite. See also f1vrnfibi 8803. (Contributed by AV, 10-Jan-2020.)
Assertion
Ref Expression
f1dmvrnfibi ((𝐴𝑉𝐹:𝐴1-1𝐵) → (𝐹 ∈ Fin ↔ ran 𝐹 ∈ Fin))

Proof of Theorem f1dmvrnfibi
StepHypRef Expression
1 rnfi 8801 . 2 (𝐹 ∈ Fin → ran 𝐹 ∈ Fin)
2 simpr 485 . . . . 5 (((𝐴𝑉𝐹:𝐴1-1𝐵) ∧ ran 𝐹 ∈ Fin) → ran 𝐹 ∈ Fin)
3 f1dm 6578 . . . . . . . . 9 (𝐹:𝐴1-1𝐵 → dom 𝐹 = 𝐴)
4 f1f1orn 6625 . . . . . . . . 9 (𝐹:𝐴1-1𝐵𝐹:𝐴1-1-onto→ran 𝐹)
5 eleq1 2905 . . . . . . . . . . . . 13 (𝐴 = dom 𝐹 → (𝐴𝑉 ↔ dom 𝐹𝑉))
6 f1oeq2 6604 . . . . . . . . . . . . 13 (𝐴 = dom 𝐹 → (𝐹:𝐴1-1-onto→ran 𝐹𝐹:dom 𝐹1-1-onto→ran 𝐹))
75, 6anbi12d 630 . . . . . . . . . . . 12 (𝐴 = dom 𝐹 → ((𝐴𝑉𝐹:𝐴1-1-onto→ran 𝐹) ↔ (dom 𝐹𝑉𝐹:dom 𝐹1-1-onto→ran 𝐹)))
87eqcoms 2834 . . . . . . . . . . 11 (dom 𝐹 = 𝐴 → ((𝐴𝑉𝐹:𝐴1-1-onto→ran 𝐹) ↔ (dom 𝐹𝑉𝐹:dom 𝐹1-1-onto→ran 𝐹)))
98biimpd 230 . . . . . . . . . 10 (dom 𝐹 = 𝐴 → ((𝐴𝑉𝐹:𝐴1-1-onto→ran 𝐹) → (dom 𝐹𝑉𝐹:dom 𝐹1-1-onto→ran 𝐹)))
109expcomd 417 . . . . . . . . 9 (dom 𝐹 = 𝐴 → (𝐹:𝐴1-1-onto→ran 𝐹 → (𝐴𝑉 → (dom 𝐹𝑉𝐹:dom 𝐹1-1-onto→ran 𝐹))))
113, 4, 10sylc 65 . . . . . . . 8 (𝐹:𝐴1-1𝐵 → (𝐴𝑉 → (dom 𝐹𝑉𝐹:dom 𝐹1-1-onto→ran 𝐹)))
1211impcom 408 . . . . . . 7 ((𝐴𝑉𝐹:𝐴1-1𝐵) → (dom 𝐹𝑉𝐹:dom 𝐹1-1-onto→ran 𝐹))
1312adantr 481 . . . . . 6 (((𝐴𝑉𝐹:𝐴1-1𝐵) ∧ ran 𝐹 ∈ Fin) → (dom 𝐹𝑉𝐹:dom 𝐹1-1-onto→ran 𝐹))
14 f1oeng 8522 . . . . . 6 ((dom 𝐹𝑉𝐹:dom 𝐹1-1-onto→ran 𝐹) → dom 𝐹 ≈ ran 𝐹)
1513, 14syl 17 . . . . 5 (((𝐴𝑉𝐹:𝐴1-1𝐵) ∧ ran 𝐹 ∈ Fin) → dom 𝐹 ≈ ran 𝐹)
16 enfii 8729 . . . . 5 ((ran 𝐹 ∈ Fin ∧ dom 𝐹 ≈ ran 𝐹) → dom 𝐹 ∈ Fin)
172, 15, 16syl2anc 584 . . . 4 (((𝐴𝑉𝐹:𝐴1-1𝐵) ∧ ran 𝐹 ∈ Fin) → dom 𝐹 ∈ Fin)
18 f1fun 6576 . . . . . 6 (𝐹:𝐴1-1𝐵 → Fun 𝐹)
1918ad2antlr 723 . . . . 5 (((𝐴𝑉𝐹:𝐴1-1𝐵) ∧ ran 𝐹 ∈ Fin) → Fun 𝐹)
20 fundmfibi 8797 . . . . 5 (Fun 𝐹 → (𝐹 ∈ Fin ↔ dom 𝐹 ∈ Fin))
2119, 20syl 17 . . . 4 (((𝐴𝑉𝐹:𝐴1-1𝐵) ∧ ran 𝐹 ∈ Fin) → (𝐹 ∈ Fin ↔ dom 𝐹 ∈ Fin))
2217, 21mpbird 258 . . 3 (((𝐴𝑉𝐹:𝐴1-1𝐵) ∧ ran 𝐹 ∈ Fin) → 𝐹 ∈ Fin)
2322ex 413 . 2 ((𝐴𝑉𝐹:𝐴1-1𝐵) → (ran 𝐹 ∈ Fin → 𝐹 ∈ Fin))
241, 23impbid2 227 1 ((𝐴𝑉𝐹:𝐴1-1𝐵) → (𝐹 ∈ Fin ↔ ran 𝐹 ∈ Fin))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 207  wa 396   = wceq 1530  wcel 2107   class class class wbr 5063  dom cdm 5554  ran crn 5555  Fun wfun 6348  1-1wf1 6351  1-1-ontowf1o 6353  cen 8500  Fincfn 8503
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1904  ax-6 1963  ax-7 2008  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2153  ax-12 2169  ax-ext 2798  ax-rep 5187  ax-sep 5200  ax-nul 5207  ax-pow 5263  ax-pr 5326  ax-un 7455
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 844  df-3or 1082  df-3an 1083  df-tru 1533  df-ex 1774  df-nf 1778  df-sb 2063  df-mo 2620  df-eu 2652  df-clab 2805  df-cleq 2819  df-clel 2898  df-nfc 2968  df-ne 3022  df-ral 3148  df-rex 3149  df-reu 3150  df-rab 3152  df-v 3502  df-sbc 3777  df-csb 3888  df-dif 3943  df-un 3945  df-in 3947  df-ss 3956  df-pss 3958  df-nul 4296  df-if 4471  df-pw 4544  df-sn 4565  df-pr 4567  df-tp 4569  df-op 4571  df-uni 4838  df-int 4875  df-iun 4919  df-br 5064  df-opab 5126  df-mpt 5144  df-tr 5170  df-id 5459  df-eprel 5464  df-po 5473  df-so 5474  df-fr 5513  df-we 5515  df-xp 5560  df-rel 5561  df-cnv 5562  df-co 5563  df-dm 5564  df-rn 5565  df-res 5566  df-ima 5567  df-pred 6147  df-ord 6193  df-on 6194  df-lim 6195  df-suc 6196  df-iota 6313  df-fun 6356  df-fn 6357  df-f 6358  df-f1 6359  df-fo 6360  df-f1o 6361  df-fv 6362  df-ov 7153  df-oprab 7154  df-mpo 7155  df-om 7574  df-1st 7685  df-2nd 7686  df-wrecs 7943  df-recs 8004  df-rdg 8042  df-1o 8098  df-oadd 8102  df-er 8284  df-en 8504  df-dom 8505  df-fin 8507
This theorem is referenced by:  f1vrnfibi  8803  fmtnoinf  43549
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