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Theorem 6p2e8 8061
Description: 6 + 2 = 8. (Contributed by NM, 11-May-2004.)
Assertion
Ref Expression
6p2e8  |-  ( 6  +  2 )  =  8

Proof of Theorem 6p2e8
StepHypRef Expression
1 df-2 7973 . . . . 5  |-  2  =  ( 1  +  1 )
21oveq2i 5523 . . . 4  |-  ( 6  +  2 )  =  ( 6  +  ( 1  +  1 ) )
3 6cn 7997 . . . . 5  |-  6  e.  CC
4 ax-1cn 6977 . . . . 5  |-  1  e.  CC
53, 4, 4addassi 7035 . . . 4  |-  ( ( 6  +  1 )  +  1 )  =  ( 6  +  ( 1  +  1 ) )
62, 5eqtr4i 2063 . . 3  |-  ( 6  +  2 )  =  ( ( 6  +  1 )  +  1 )
7 df-7 7978 . . . 4  |-  7  =  ( 6  +  1 )
87oveq1i 5522 . . 3  |-  ( 7  +  1 )  =  ( ( 6  +  1 )  +  1 )
96, 8eqtr4i 2063 . 2  |-  ( 6  +  2 )  =  ( 7  +  1 )
10 df-8 7979 . 2  |-  8  =  ( 7  +  1 )
119, 10eqtr4i 2063 1  |-  ( 6  +  2 )  =  8
Colors of variables: wff set class
Syntax hints:    = wceq 1243  (class class class)co 5512   1c1 6890    + caddc 6892   2c2 7964   6c6 7968   7c7 7969   8c8 7970
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 630  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-10 1396  ax-11 1397  ax-i12 1398  ax-bndl 1399  ax-4 1400  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428  ax-ext 2022  ax-resscn 6976  ax-1cn 6977  ax-1re 6978  ax-addrcl 6981  ax-addass 6986
This theorem depends on definitions:  df-bi 110  df-3an 887  df-tru 1246  df-nf 1350  df-sb 1646  df-clab 2027  df-cleq 2033  df-clel 2036  df-nfc 2167  df-rex 2312  df-v 2559  df-un 2922  df-in 2924  df-ss 2931  df-sn 3381  df-pr 3382  df-op 3384  df-uni 3581  df-br 3765  df-iota 4867  df-fv 4910  df-ov 5515  df-2 7973  df-3 7974  df-4 7975  df-5 7976  df-6 7977  df-7 7978  df-8 7979
This theorem is referenced by:  6p3e9  8062  6t3e18  8445
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