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Theorem nnaddcld 8524
Description: Closure of addition of positive integers. (Contributed by Mario Carneiro, 27-May-2016.)
Hypotheses
Ref Expression
nnge1d.1  |-  ( ph  ->  A  e.  NN )
nnmulcld.2  |-  ( ph  ->  B  e.  NN )
Assertion
Ref Expression
nnaddcld  |-  ( ph  ->  ( A  +  B
)  e.  NN )

Proof of Theorem nnaddcld
StepHypRef Expression
1 nnge1d.1 . 2  |-  ( ph  ->  A  e.  NN )
2 nnmulcld.2 . 2  |-  ( ph  ->  B  e.  NN )
3 nnaddcl 8496 . 2  |-  ( ( A  e.  NN  /\  B  e.  NN )  ->  ( A  +  B
)  e.  NN )
41, 2, 3syl2anc 404 1  |-  ( ph  ->  ( A  +  B
)  e.  NN )
Colors of variables: wff set class
Syntax hints:    -> wi 4    e. wcel 1439  (class class class)co 5666    + caddc 7407   NNcn 8476
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 666  ax-5 1382  ax-7 1383  ax-gen 1384  ax-ie1 1428  ax-ie2 1429  ax-8 1441  ax-10 1442  ax-11 1443  ax-i12 1444  ax-bndl 1445  ax-4 1446  ax-17 1465  ax-i9 1469  ax-ial 1473  ax-i5r 1474  ax-ext 2071  ax-sep 3963  ax-cnex 7490  ax-resscn 7491  ax-1cn 7492  ax-1re 7493  ax-addrcl 7496  ax-addass 7501
This theorem depends on definitions:  df-bi 116  df-3an 927  df-tru 1293  df-nf 1396  df-sb 1694  df-clab 2076  df-cleq 2082  df-clel 2085  df-nfc 2218  df-ral 2365  df-rex 2366  df-rab 2369  df-v 2622  df-un 3004  df-in 3006  df-ss 3013  df-sn 3456  df-pr 3457  df-op 3459  df-uni 3660  df-int 3695  df-br 3852  df-iota 4993  df-fv 5036  df-ov 5669  df-inn 8477
This theorem is referenced by: (None)
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