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Theorem 4p2e6 9277
Description: 4 + 2 = 6. (Contributed by NM, 11-May-2004.)
Assertion
Ref Expression
4p2e6  |-  ( 4  +  2 )  =  6

Proof of Theorem 4p2e6
StepHypRef Expression
1 df-2 9192 . . . . 5  |-  2  =  ( 1  +  1 )
21oveq2i 6024 . . . 4  |-  ( 4  +  2 )  =  ( 4  +  ( 1  +  1 ) )
3 4cn 9211 . . . . 5  |-  4  e.  CC
4 ax-1cn 8115 . . . . 5  |-  1  e.  CC
53, 4, 4addassi 8177 . . . 4  |-  ( ( 4  +  1 )  +  1 )  =  ( 4  +  ( 1  +  1 ) )
62, 5eqtr4i 2253 . . 3  |-  ( 4  +  2 )  =  ( ( 4  +  1 )  +  1 )
7 df-5 9195 . . . 4  |-  5  =  ( 4  +  1 )
87oveq1i 6023 . . 3  |-  ( 5  +  1 )  =  ( ( 4  +  1 )  +  1 )
96, 8eqtr4i 2253 . 2  |-  ( 4  +  2 )  =  ( 5  +  1 )
10 df-6 9196 . 2  |-  6  =  ( 5  +  1 )
119, 10eqtr4i 2253 1  |-  ( 4  +  2 )  =  6
Colors of variables: wff set class
Syntax hints:    = wceq 1395  (class class class)co 6013   1c1 8023    + caddc 8025   2c2 9184   4c4 9186   5c5 9187   6c6 9188
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 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-ext 2211  ax-resscn 8114  ax-1cn 8115  ax-1re 8116  ax-addrcl 8119  ax-addass 8124
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-rex 2514  df-v 2802  df-un 3202  df-in 3204  df-ss 3211  df-sn 3673  df-pr 3674  df-op 3676  df-uni 3892  df-br 4087  df-iota 5284  df-fv 5332  df-ov 6016  df-2 9192  df-3 9193  df-4 9194  df-5 9195  df-6 9196
This theorem is referenced by:  4p3e7  9278  div4p1lem1div2  9388  4t4e16  9699  6gcd4e2  12556  2exp16  13000
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