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Theorem 5p4e9 9403
Description: 5 + 4 = 9. (Contributed by NM, 11-May-2004.)
Assertion
Ref Expression
5p4e9  |-  ( 5  +  4 )  =  9

Proof of Theorem 5p4e9
StepHypRef Expression
1 df-4 9315 . . . 4  |-  4  =  ( 3  +  1 )
21oveq2i 6069 . . 3  |-  ( 5  +  4 )  =  ( 5  +  ( 3  +  1 ) )
3 5cn 9334 . . . 4  |-  5  e.  CC
4 3cn 9329 . . . 4  |-  3  e.  CC
5 ax-1cn 8236 . . . 4  |-  1  e.  CC
63, 4, 5addassi 8298 . . 3  |-  ( ( 5  +  3 )  +  1 )  =  ( 5  +  ( 3  +  1 ) )
72, 6eqtr4i 2258 . 2  |-  ( 5  +  4 )  =  ( ( 5  +  3 )  +  1 )
8 df-9 9320 . . 3  |-  9  =  ( 8  +  1 )
9 5p3e8 9402 . . . 4  |-  ( 5  +  3 )  =  8
109oveq1i 6068 . . 3  |-  ( ( 5  +  3 )  +  1 )  =  ( 8  +  1 )
118, 10eqtr4i 2258 . 2  |-  9  =  ( ( 5  +  3 )  +  1 )
127, 11eqtr4i 2258 1  |-  ( 5  +  4 )  =  9
Colors of variables: wff set class
Syntax hints:    = wceq 1398  (class class class)co 6058   1c1 8144    + caddc 8146   3c3 9306   4c4 9307   5c5 9308   8c8 9311   9c9 9312
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-resscn 8235  ax-1cn 8236  ax-1re 8237  ax-addrcl 8240  ax-addass 8245
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-rex 2528  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-br 4115  df-iota 5317  df-fv 5365  df-ov 6061  df-2 9313  df-3 9314  df-4 9315  df-5 9316  df-6 9317  df-7 9318  df-8 9319  df-9 9320
This theorem is referenced by:  5p5e10  9797
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