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Theorem onsuci 4509
Description: The successor of an ordinal number is an ordinal number. Corollary 7N(c) of [Enderton] p. 193. (Contributed by NM, 12-Jun-1994.)
Hypothesis
Ref Expression
onssi.1  |-  A  e.  On
Assertion
Ref Expression
onsuci  |-  suc  A  e.  On

Proof of Theorem onsuci
StepHypRef Expression
1 onssi.1 . 2  |-  A  e.  On
2 suceloni 4494 . 2  |-  ( A  e.  On  ->  suc  A  e.  On )
31, 2ax-mp 5 1  |-  suc  A  e.  On
Colors of variables: wff set class
Syntax hints:    e. wcel 2146   Oncon0 4357   suc csuc 4359
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-io 709  ax-5 1445  ax-7 1446  ax-gen 1447  ax-ie1 1491  ax-ie2 1492  ax-8 1502  ax-10 1503  ax-11 1504  ax-i12 1505  ax-bndl 1507  ax-4 1508  ax-17 1524  ax-i9 1528  ax-ial 1532  ax-i5r 1533  ax-13 2148  ax-14 2149  ax-ext 2157  ax-sep 4116  ax-pow 4169  ax-pr 4203  ax-un 4427
This theorem depends on definitions:  df-bi 117  df-tru 1356  df-nf 1459  df-sb 1761  df-clab 2162  df-cleq 2168  df-clel 2171  df-nfc 2306  df-ral 2458  df-rex 2459  df-v 2737  df-un 3131  df-in 3133  df-ss 3140  df-pw 3574  df-sn 3595  df-pr 3596  df-uni 3806  df-tr 4097  df-iord 4360  df-on 4362  df-suc 4365
This theorem is referenced by:  ordtri2orexmid  4516  onsucsssucexmid  4520  ordsoexmid  4555  ordtri2or2exmid  4564  ontri2orexmidim  4565  tfr0dm  6313  1on  6414  2on  6416  3on  6418  4on  6419  onntri35  7226  onntri45  7230  prarloclemarch2  7393
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