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Theorem peano2nnd 9269
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 9266 . 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 2205  (class class class)co 6058   1c1 8144    + caddc 8146   NNcn 9254
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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2216  ax-sep 4233  ax-cnex 8234  ax-resscn 8235  ax-1re 8237  ax-addrcl 8240
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ral 2527  df-rex 2528  df-v 2817  df-un 3218  df-in 3220  df-ss 3227  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-int 3955  df-br 4115  df-iota 5317  df-fv 5365  df-ov 6061  df-inn 9255
This theorem is referenced by:  exp3vallem  10926  bcpasc  11153  caucvgre  11691  resqrexlemdecn  11722  cvgratnnlemmn  12236  cvgratnnlemseq  12237  cvgratnnlemabsle  12238  eftlub  12401  eirraplem  12488  infpnlem1  13082  infpnlem2  13083  1arith  13090  oddennn  13227  exmidunben  13261  nninfdclemp1  13285  nninfdclemlt  13286  perfectlem1  15993  perfectlem2  15994  lgsdilem2  16035  cvgcmp2nlemabs  16942  trilpolemeq1  16950  trilpolemlt1  16951  nconstwlpolemgt0  16976
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