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Theorem peano2nnd 9136
Description: Peano postulate: a successor of a positive integer is a positive integer. (Contributed by Mario Carneiro, 27-May-2016.)
Hypothesis
Ref Expression
nnred.1  |-  ( ph  ->  A  e.  NN )
Assertion
Ref Expression
peano2nnd  |-  ( ph  ->  ( A  +  1 )  e.  NN )

Proof of Theorem peano2nnd
StepHypRef Expression
1 nnred.1 . 2  |-  ( ph  ->  A  e.  NN )
2 peano2nn 9133 . 2  |-  ( A  e.  NN  ->  ( A  +  1 )  e.  NN )
31, 2syl 14 1  |-  ( ph  ->  ( A  +  1 )  e.  NN )
Colors of variables: wff set class
Syntax hints:    -> wi 4    e. wcel 2200  (class class class)co 6007   1c1 8011    + caddc 8013   NNcn 9121
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 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-ext 2211  ax-sep 4202  ax-cnex 8101  ax-resscn 8102  ax-1re 8104  ax-addrcl 8107
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-rex 2514  df-v 2801  df-un 3201  df-in 3203  df-ss 3210  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3889  df-int 3924  df-br 4084  df-iota 5278  df-fv 5326  df-ov 6010  df-inn 9122
This theorem is referenced by:  exp3vallem  10774  bcpasc  11000  caucvgre  11508  resqrexlemdecn  11539  cvgratnnlemmn  12052  cvgratnnlemseq  12053  cvgratnnlemabsle  12054  eftlub  12217  eirraplem  12304  infpnlem1  12898  infpnlem2  12899  1arith  12906  oddennn  12979  exmidunben  13013  nninfdclemp1  13037  nninfdclemlt  13038  perfectlem1  15689  perfectlem2  15690  lgsdilem2  15731  cvgcmp2nlemabs  16488  trilpolemeq1  16496  trilpolemlt1  16497  nconstwlpolemgt0  16520
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