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Theorem nnssnn0 8987
Description: Positive naturals are a subset of nonnegative integers. (Contributed by Raph Levien, 10-Dec-2002.)
Assertion
Ref Expression
nnssnn0  |-  NN  C_  NN0

Proof of Theorem nnssnn0
StepHypRef Expression
1 ssun1 3239 . 2  |-  NN  C_  ( NN  u.  { 0 } )
2 df-n0 8985 . 2  |-  NN0  =  ( NN  u.  { 0 } )
31, 2sseqtrri 3132 1  |-  NN  C_  NN0
Colors of variables: wff set class
Syntax hints:    u. cun 3069    C_ wss 3071   {csn 3527   0cc0 7627   NNcn 8727   NN0cn0 8984
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2121
This theorem depends on definitions:  df-bi 116  df-tru 1334  df-nf 1437  df-sb 1736  df-clab 2126  df-cleq 2132  df-clel 2135  df-nfc 2270  df-v 2688  df-un 3075  df-in 3077  df-ss 3084  df-n0 8985
This theorem is referenced by:  nnnn0  8991  nnnn0d  9037  expcnv  11280  oddge22np1  11585
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