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Theorem nn0ssre 8292
Description: Nonnegative integers are a subset of the reals. (Contributed by Raph Levien, 10-Dec-2002.)
Assertion
Ref Expression
nn0ssre  |-  NN0  C_  RR

Proof of Theorem nn0ssre
StepHypRef Expression
1 df-n0 8289 . 2  |-  NN0  =  ( NN  u.  { 0 } )
2 nnssre 8043 . . 3  |-  NN  C_  RR
3 0re 7119 . . . 4  |-  0  e.  RR
4 snssi 3529 . . . 4  |-  ( 0  e.  RR  ->  { 0 }  C_  RR )
53, 4ax-mp 7 . . 3  |-  { 0 }  C_  RR
62, 5unssi 3147 . 2  |-  ( NN  u.  { 0 } )  C_  RR
71, 6eqsstri 3029 1  |-  NN0  C_  RR
Colors of variables: wff set class
Syntax hints:    e. wcel 1433    u. cun 2971    C_ wss 2973   {csn 3398   RRcr 6980   0cc0 6981   NNcn 8039   NN0cn0 8288
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 662  ax-5 1376  ax-7 1377  ax-gen 1378  ax-ie1 1422  ax-ie2 1423  ax-8 1435  ax-10 1436  ax-11 1437  ax-i12 1438  ax-bndl 1439  ax-4 1440  ax-17 1459  ax-i9 1463  ax-ial 1467  ax-i5r 1468  ax-ext 2063  ax-sep 3896  ax-cnex 7067  ax-resscn 7068  ax-1re 7070  ax-addrcl 7073  ax-rnegex 7085
This theorem depends on definitions:  df-bi 115  df-tru 1287  df-nf 1390  df-sb 1686  df-clab 2068  df-cleq 2074  df-clel 2077  df-nfc 2208  df-ral 2353  df-rex 2354  df-v 2603  df-un 2977  df-in 2979  df-ss 2986  df-sn 3404  df-int 3637  df-inn 8040  df-n0 8289
This theorem is referenced by:  nn0sscn  8293  nn0re  8297  nn0rei  8299  nn0red  8342
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