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Theorem piord 3802
Description: A positive integer is ordinal.
Assertion
Ref Expression
piord (AN → Ord A)

Proof of Theorem piord
StepHypRef Expression
1 pinn 3800 . 2 (ANA ∈ ω)
2 nnord 2381 . 2 (A ∈ ω → Ord A)
31, 2syl 12 1 (AN → Ord A)
Colors of variables: wff set class
Syntax hints:   → wi 2   ∈ wcel 1092  Ord word 2198  ωcom 2372  Ncnpi 3766
This theorem is referenced by:  ltsopi 3810
This theorem was proved from axioms:  ax-1 3  ax-2 4  ax-3 5  ax-mp 6  ax-4 673  ax-5 674  ax-6 675  ax-7 676  ax-gen 677  ax-8 798  ax-9 799  ax-10 800  ax-11 801  ax-12 802  ax-16 922  ax-17 925  ax-ext 1074
This theorem depends on definitions:  df-bi 128  df-or 197  df-an 198  df-3an 583  df-ex 679  df-sb 853  df-clab 1093  df-cleq 1097  df-clel 1099  df-ral 1205  df-rex 1206  df-v 1349  df-dif 1489  df-un 1490  df-in 1491  df-ss 1492  df-nul 1708  df-sn 1811  df-pr 1812  df-op 1815  df-uni 1920  df-tr 2042  df-br 2063  df-po 2128  df-so 2138  df-fr 2169  df-we 2186  df-ord 2202  df-on 2203  df-om 2373  df-ni 3794
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