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Theorem fmtnorn 45960
Description: A Fermat number is a function value of the enumeration of the Fermat numbers. (Contributed by AV, 3-Aug-2021.)
Assertion
Ref Expression
fmtnorn (𝐹 ∈ ran FermatNo ↔ βˆƒπ‘› ∈ β„•0 (FermatNoβ€˜π‘›) = 𝐹)
Distinct variable group:   𝑛,𝐹

Proof of Theorem fmtnorn
StepHypRef Expression
1 ovex 7423 . . 3 ((2↑(2↑𝑛)) + 1) ∈ V
2 df-fmtno 45954 . . 3 FermatNo = (𝑛 ∈ β„•0 ↦ ((2↑(2↑𝑛)) + 1))
31, 2fnmpti 6677 . 2 FermatNo Fn β„•0
4 fvelrnb 6936 . 2 (FermatNo Fn β„•0 β†’ (𝐹 ∈ ran FermatNo ↔ βˆƒπ‘› ∈ β„•0 (FermatNoβ€˜π‘›) = 𝐹))
53, 4ax-mp 5 1 (𝐹 ∈ ran FermatNo ↔ βˆƒπ‘› ∈ β„•0 (FermatNoβ€˜π‘›) = 𝐹)
Colors of variables: wff setvar class
Syntax hints:   ↔ wb 205   = wceq 1541   ∈ wcel 2106  βˆƒwrex 3069  ran crn 5667   Fn wfn 6524  β€˜cfv 6529  (class class class)co 7390  1c1 11090   + caddc 11092  2c2 12246  β„•0cn0 12451  β†‘cexp 14006  FermatNocfmtno 45953
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2702  ax-sep 5289  ax-nul 5296  ax-pr 5417
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-nf 1786  df-sb 2068  df-mo 2533  df-eu 2562  df-clab 2709  df-cleq 2723  df-clel 2809  df-nfc 2884  df-ne 2940  df-ral 3061  df-rex 3070  df-rab 3430  df-v 3472  df-dif 3944  df-un 3946  df-in 3948  df-ss 3958  df-nul 4316  df-if 4520  df-sn 4620  df-pr 4622  df-op 4626  df-uni 4899  df-br 5139  df-opab 5201  df-mpt 5222  df-id 5564  df-xp 5672  df-rel 5673  df-cnv 5674  df-co 5675  df-dm 5676  df-rn 5677  df-iota 6481  df-fun 6531  df-fn 6532  df-fv 6537  df-ov 7393  df-fmtno 45954
This theorem is referenced by:  prmdvdsfmtnof1lem2  46011  prmdvdsfmtnof  46012  prmdvdsfmtnof1  46013
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