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Theorem nn0nnaddcl 9544
Description: A nonnegative integer plus a positive integer is a positive integer. (Contributed by NM, 22-Dec-2005.)
Assertion
Ref Expression
nn0nnaddcl  |-  ( ( M  e.  NN0  /\  N  e.  NN )  ->  ( M  +  N
)  e.  NN )

Proof of Theorem nn0nnaddcl
StepHypRef Expression
1 nncn 9262 . . . 4  |-  ( N  e.  NN  ->  N  e.  CC )
2 nn0cn 9523 . . . 4  |-  ( M  e.  NN0  ->  M  e.  CC )
3 addcom 8426 . . . 4  |-  ( ( N  e.  CC  /\  M  e.  CC )  ->  ( N  +  M
)  =  ( M  +  N ) )
41, 2, 3syl2an 289 . . 3  |-  ( ( N  e.  NN  /\  M  e.  NN0 )  -> 
( N  +  M
)  =  ( M  +  N ) )
5 nnnn0addcl 9543 . . 3  |-  ( ( N  e.  NN  /\  M  e.  NN0 )  -> 
( N  +  M
)  e.  NN )
64, 5eqeltrrd 2312 . 2  |-  ( ( N  e.  NN  /\  M  e.  NN0 )  -> 
( M  +  N
)  e.  NN )
76ancoms 268 1  |-  ( ( M  e.  NN0  /\  N  e.  NN )  ->  ( M  +  N
)  e.  NN )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    = wceq 1398    e. wcel 2205  (class class class)co 6058   CCcc 8141    + caddc 8146   NNcn 9254   NN0cn0 9513
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-1cn 8236  ax-1re 8237  ax-icn 8238  ax-addcl 8239  ax-addrcl 8240  ax-mulcl 8241  ax-addcom 8243  ax-addass 8245  ax-i2m1 8248  ax-0id 8251  ax-rnegex 8252
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-rab 2531  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  df-n0 9514
This theorem is referenced by:  nn0p1nn  9552  nnaddm1cl  9656  numnncl  9736  modfzo0difsn  10781
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