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Theorem 5p3e8 9350
Description: 5 + 3 = 8. (Contributed by NM, 11-May-2004.)
Assertion
Ref Expression
5p3e8  |-  ( 5  +  3 )  =  8

Proof of Theorem 5p3e8
StepHypRef Expression
1 df-3 9262 . . . 4  |-  3  =  ( 2  +  1 )
21oveq2i 6039 . . 3  |-  ( 5  +  3 )  =  ( 5  +  ( 2  +  1 ) )
3 5cn 9282 . . . 4  |-  5  e.  CC
4 2cn 9273 . . . 4  |-  2  e.  CC
5 ax-1cn 8185 . . . 4  |-  1  e.  CC
63, 4, 5addassi 8247 . . 3  |-  ( ( 5  +  2 )  +  1 )  =  ( 5  +  ( 2  +  1 ) )
72, 6eqtr4i 2255 . 2  |-  ( 5  +  3 )  =  ( ( 5  +  2 )  +  1 )
8 df-8 9267 . . 3  |-  8  =  ( 7  +  1 )
9 5p2e7 9349 . . . 4  |-  ( 5  +  2 )  =  7
109oveq1i 6038 . . 3  |-  ( ( 5  +  2 )  +  1 )  =  ( 7  +  1 )
118, 10eqtr4i 2255 . 2  |-  8  =  ( ( 5  +  2 )  +  1 )
127, 11eqtr4i 2255 1  |-  ( 5  +  3 )  =  8
Colors of variables: wff set class
Syntax hints:    = wceq 1398  (class class class)co 6028   1c1 8093    + caddc 8095   2c2 9253   3c3 9254   5c5 9256   7c7 9258   8c8 9259
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 2213  ax-resscn 8184  ax-1cn 8185  ax-1re 8186  ax-addrcl 8189  ax-addass 8194
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-rex 2517  df-v 2805  df-un 3205  df-in 3207  df-ss 3214  df-sn 3679  df-pr 3680  df-op 3682  df-uni 3899  df-br 4094  df-iota 5293  df-fv 5341  df-ov 6031  df-2 9261  df-3 9262  df-4 9263  df-5 9264  df-6 9265  df-7 9266  df-8 9267
This theorem is referenced by:  5p4e9  9351  ef01bndlem  12397  2exp16  13090  lgsdir2lem1  15847
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