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Theorem f1oenfi 9129
Description: If the domain of a one-to-one, onto function is finite, then the domain and range of the function are equinumerous. This theorem is proved without using the Axiom of Replacement or the Axiom of Power Sets (unlike f1oeng 8914). (Contributed by BTernaryTau, 8-Sep-2024.)
Assertion
Ref Expression
f1oenfi ((𝐴 ∈ Fin ∧ 𝐹:𝐴1-1-onto𝐵) → 𝐴𝐵)

Proof of Theorem f1oenfi
StepHypRef Expression
1 f1ofn 6786 . . . 4 (𝐹:𝐴1-1-onto𝐵𝐹 Fn 𝐴)
2 fnfi 9128 . . . 4 ((𝐹 Fn 𝐴𝐴 ∈ Fin) → 𝐹 ∈ Fin)
31, 2sylan 581 . . 3 ((𝐹:𝐴1-1-onto𝐵𝐴 ∈ Fin) → 𝐹 ∈ Fin)
43ancoms 460 . 2 ((𝐴 ∈ Fin ∧ 𝐹:𝐴1-1-onto𝐵) → 𝐹 ∈ Fin)
5 f1oen3g 8909 . 2 ((𝐹 ∈ Fin ∧ 𝐹:𝐴1-1-onto𝐵) → 𝐴𝐵)
64, 5sylancom 589 1 ((𝐴 ∈ Fin ∧ 𝐹:𝐴1-1-onto𝐵) → 𝐴𝐵)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 397  wcel 2107   class class class wbr 5106   Fn wfn 6492  1-1-ontowf1o 6496  cen 8883  Fincfn 8886
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2155  ax-12 2172  ax-ext 2704  ax-sep 5257  ax-nul 5264  ax-pr 5385  ax-un 7673
This theorem depends on definitions:  df-bi 206  df-an 398  df-or 847  df-3or 1089  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1783  df-nf 1787  df-sb 2069  df-mo 2535  df-eu 2564  df-clab 2711  df-cleq 2725  df-clel 2811  df-nfc 2886  df-ne 2941  df-ral 3062  df-rex 3071  df-reu 3353  df-rab 3407  df-v 3446  df-sbc 3741  df-dif 3914  df-un 3916  df-in 3918  df-ss 3928  df-pss 3930  df-nul 4284  df-if 4488  df-pw 4563  df-sn 4588  df-pr 4590  df-op 4594  df-uni 4867  df-br 5107  df-opab 5169  df-tr 5224  df-id 5532  df-eprel 5538  df-po 5546  df-so 5547  df-fr 5589  df-we 5591  df-xp 5640  df-rel 5641  df-cnv 5642  df-co 5643  df-dm 5644  df-rn 5645  df-res 5646  df-ima 5647  df-ord 6321  df-on 6322  df-lim 6323  df-suc 6324  df-iota 6449  df-fun 6499  df-fn 6500  df-f 6501  df-f1 6502  df-fo 6503  df-f1o 6504  df-fv 6505  df-om 7804  df-1o 8413  df-en 8887  df-fin 8890
This theorem is referenced by:  enreffi  9133  ensymfib  9134  entrfil  9135  f1imaenfi  9145  f1finf1o  9218  sticksstones18  40618  sticksstones19  40619
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