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Theorem nnnn0addcl 9325
Description: A positive integer plus a nonnegative integer is a positive integer. (Contributed by NM, 20-Apr-2005.) (Proof shortened by Mario Carneiro, 16-May-2014.)
Assertion
Ref Expression
nnnn0addcl  |-  ( ( M  e.  NN  /\  N  e.  NN0 )  -> 
( M  +  N
)  e.  NN )

Proof of Theorem nnnn0addcl
StepHypRef Expression
1 elnn0 9297 . 2  |-  ( N  e.  NN0  <->  ( N  e.  NN  \/  N  =  0 ) )
2 nnaddcl 9056 . . 3  |-  ( ( M  e.  NN  /\  N  e.  NN )  ->  ( M  +  N
)  e.  NN )
3 oveq2 5952 . . . . 5  |-  ( N  =  0  ->  ( M  +  N )  =  ( M  + 
0 ) )
4 nncn 9044 . . . . . 6  |-  ( M  e.  NN  ->  M  e.  CC )
54addridd 8221 . . . . 5  |-  ( M  e.  NN  ->  ( M  +  0 )  =  M )
63, 5sylan9eqr 2260 . . . 4  |-  ( ( M  e.  NN  /\  N  =  0 )  ->  ( M  +  N )  =  M )
7 simpl 109 . . . 4  |-  ( ( M  e.  NN  /\  N  =  0 )  ->  M  e.  NN )
86, 7eqeltrd 2282 . . 3  |-  ( ( M  e.  NN  /\  N  =  0 )  ->  ( M  +  N )  e.  NN )
92, 8jaodan 799 . 2  |-  ( ( M  e.  NN  /\  ( N  e.  NN  \/  N  =  0
) )  ->  ( M  +  N )  e.  NN )
101, 9sylan2b 287 1  |-  ( ( M  e.  NN  /\  N  e.  NN0 )  -> 
( M  +  N
)  e.  NN )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    \/ wo 710    = wceq 1373    e. wcel 2176  (class class class)co 5944   0cc0 7925    + caddc 7928   NNcn 9036   NN0cn0 9295
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 711  ax-5 1470  ax-7 1471  ax-gen 1472  ax-ie1 1516  ax-ie2 1517  ax-8 1527  ax-10 1528  ax-11 1529  ax-i12 1530  ax-bndl 1532  ax-4 1533  ax-17 1549  ax-i9 1553  ax-ial 1557  ax-i5r 1558  ax-ext 2187  ax-sep 4162  ax-cnex 8016  ax-resscn 8017  ax-1cn 8018  ax-1re 8019  ax-icn 8020  ax-addcl 8021  ax-addrcl 8022  ax-mulcl 8023  ax-addass 8027  ax-i2m1 8030  ax-0id 8033
This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1484  df-sb 1786  df-clab 2192  df-cleq 2198  df-clel 2201  df-nfc 2337  df-ral 2489  df-rex 2490  df-rab 2493  df-v 2774  df-un 3170  df-in 3172  df-ss 3179  df-sn 3639  df-pr 3640  df-op 3642  df-uni 3851  df-int 3886  df-br 4045  df-iota 5232  df-fv 5279  df-ov 5947  df-inn 9037  df-n0 9296
This theorem is referenced by:  nn0nnaddcl  9326  elz2  9444  bcxmas  11800  dec2nprm  12738
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