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Theorem fict 7170
Description: A finite set is dominated by ω. Also see finct 7456. (Contributed by Thierry Arnoux, 27-Mar-2018.)
Assertion
Ref Expression
fict (𝐴 ∈ Fin → 𝐴 ≼ ω)

Proof of Theorem fict
Dummy variable 𝑛 is distinct from all other variables.
StepHypRef Expression
1 isfi 7047 . . 3 (𝐴 ∈ Fin ↔ ∃𝑛 ∈ ω 𝐴𝑛)
21biimpi 120 . 2 (𝐴 ∈ Fin → ∃𝑛 ∈ ω 𝐴𝑛)
3 simprr 537 . . 3 ((𝐴 ∈ Fin ∧ (𝑛 ∈ ω ∧ 𝐴𝑛)) → 𝐴𝑛)
4 omex 4740 . . . . 5 ω ∈ V
5 ordom 4754 . . . . . 6 Ord ω
6 ordelss 4524 . . . . . 6 ((Ord ω ∧ 𝑛 ∈ ω) → 𝑛 ⊆ ω)
75, 6mpan 428 . . . . 5 (𝑛 ∈ ω → 𝑛 ⊆ ω)
8 ssdomg 7065 . . . . 5 (ω ∈ V → (𝑛 ⊆ ω → 𝑛 ≼ ω))
94, 7, 8mpsyl 65 . . . 4 (𝑛 ∈ ω → 𝑛 ≼ ω)
109ad2antrl 494 . . 3 ((𝐴 ∈ Fin ∧ (𝑛 ∈ ω ∧ 𝐴𝑛)) → 𝑛 ≼ ω)
11 endomtr 7077 . . 3 ((𝐴𝑛𝑛 ≼ ω) → 𝐴 ≼ ω)
123, 10, 11syl2anc 415 . 2 ((𝐴 ∈ Fin ∧ (𝑛 ∈ ω ∧ 𝐴𝑛)) → 𝐴 ≼ ω)
132, 12rexlimddv 2673 1 (𝐴 ∈ Fin → 𝐴 ≼ ω)
Colors of variables:    wff set class
This proof depends on syntax axioms:  wi 4  wa 104  wcel 2209  wrex 2529  Vcvv 2821  wss 3220   class class class wbr 4130  Ord word 4507  ωcom 4737  cen 7020  cdom 7021  Fincfn 7022
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4249  ax-nul 4259  ax-pow 4311  ax-pr 4346  ax-un 4578  ax-iinf 4735
This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-int 3971  df-br 4131  df-opab 4193  df-tr 4230  df-id 4438  df-iord 4511  df-suc 4516  df-iom 4738  df-xp 4780  df-rel 4781  df-cnv 4782  df-co 4783  df-dm 4784  df-rn 4785  df-res 4786  df-ima 4787  df-fun 5379  df-fn 5380  df-f 5381  df-f1 5382  df-fo 5383  df-f1o 5384  df-en 7023  df-dom 7024  df-fin 7025
This theorem is used by:  pw1ninf  17021
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