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Theorem suceloni 4412
Description: The successor of an ordinal number is an ordinal number. Proposition 7.24 of [TakeutiZaring] p. 41. (Contributed by NM, 6-Jun-1994.)
Assertion
Ref Expression
suceloni  |-  ( A  e.  On  ->  suc  A  e.  On )

Proof of Theorem suceloni
StepHypRef Expression
1 eloni 4292 . . 3  |-  ( A  e.  On  ->  Ord  A )
2 ordsucim 4411 . . 3  |-  ( Ord 
A  ->  Ord  suc  A
)
31, 2syl 14 . 2  |-  ( A  e.  On  ->  Ord  suc 
A )
4 sucexg 4409 . . 3  |-  ( A  e.  On  ->  suc  A  e.  _V )
5 elong 4290 . . 3  |-  ( suc 
A  e.  _V  ->  ( suc  A  e.  On  <->  Ord 
suc  A ) )
64, 5syl 14 . 2  |-  ( A  e.  On  ->  ( suc  A  e.  On  <->  Ord  suc  A
) )
73, 6mpbird 166 1  |-  ( A  e.  On  ->  suc  A  e.  On )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 104    e. wcel 1480   _Vcvv 2681   Ord word 4279   Oncon0 4280   suc csuc 4282
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-13 1491  ax-14 1492  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2119  ax-sep 4041  ax-pow 4093  ax-pr 4126  ax-un 4350
This theorem depends on definitions:  df-bi 116  df-tru 1334  df-nf 1437  df-sb 1736  df-clab 2124  df-cleq 2130  df-clel 2133  df-nfc 2268  df-ral 2419  df-rex 2420  df-v 2683  df-un 3070  df-in 3072  df-ss 3079  df-pw 3507  df-sn 3528  df-pr 3529  df-uni 3732  df-tr 4022  df-iord 4283  df-on 4285  df-suc 4288
This theorem is referenced by:  sucelon  4414  unon  4422  onsuci  4427  ordsucunielexmid  4441  tfrlemisucaccv  6215  tfrexlem  6224  tfri1dALT  6241  rdgisuc1  6274  rdgon  6276  oacl  6349  oasuc  6353  omsuc  6361
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