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Theorem nnoni 4756
Description: A natural number is an ordinal number. (Contributed by NM, 27-Jun-1994.)
Hypothesis
Ref Expression
nnoni.1  |-  A  e. 
om
Assertion
Ref Expression
nnoni  |-  A  e.  On

Proof of Theorem nnoni
StepHypRef Expression
1 nnoni.1 . 2  |-  A  e. 
om
2 nnon 4755 . 2  |-  ( A  e.  om  ->  A  e.  On )
31, 2ax-mp 5 1  |-  A  e.  On
Colors of variables: wff set class
Syntax hints:    e. wcel 2209   Oncon0 4506   omcom 4735
This theorem was proved from 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 4247  ax-nul 4257  ax-pow 4309  ax-pr 4344  ax-un 4576  ax-iinf 4733
This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  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 3714  df-pr 3715  df-uni 3934  df-int 3969  df-tr 4228  df-iord 4509  df-on 4511  df-suc 4514  df-iom 4736
This theorem is referenced by: (None)
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