ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  peano2nnd GIF version

Theorem peano2nnd 9302
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 (𝜑𝐴 ∈ ℕ)
Assertion
Ref Expression
peano2nnd (𝜑 → (𝐴 + 1) ∈ ℕ)

Proof of Theorem peano2nnd
StepHypRef Expression
1 nnred.1 . 2 (𝜑𝐴 ∈ ℕ)
2 peano2nn 9299 . 2 (𝐴 ∈ ℕ → (𝐴 + 1) ∈ ℕ)
31, 2syl 14 1 (𝜑 → (𝐴 + 1) ∈ ℕ)
Colors of variables: wff set class
Syntax hints:  wi 4  wcel 2209  (class class class)co 6079  1c1 8174   + caddc 8176  cn 9287
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 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-ext 2220  ax-sep 4247  ax-cnex 8264  ax-resscn 8265  ax-1re 8267  ax-addrcl 8270
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-un 3224  df-in 3226  df-ss 3233  df-sn 3714  df-pr 3715  df-op 3717  df-uni 3934  df-int 3969  df-br 4129  df-iota 5335  df-fv 5383  df-ov 6082  df-inn 9288
This theorem is referenced by:  exp3vallem  10960  bcpasc  11187  caucvgre  11730  resqrexlemdecn  11761  cvgratnnlemmn  12275  cvgratnnlemseq  12276  cvgratnnlemabsle  12277  eftlub  12440  eirraplem  12527  infpnlem1  13121  infpnlem2  13122  1arith  13129  oddennn  13266  exmidunben  13300  nninfdclemp1  13324  nninfdclemlt  13325  perfectlem1  16096  perfectlem2  16097  lgsdilem2  16138  cvgcmp2nlemabs  17055  trilpolemeq1  17063  trilpolemlt1  17064  nconstwlpolemgt0  17088
  Copyright terms: Public domain W3C validator