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Theorem 4p2e6 9449
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 9364 . . . . 5  |-  2  =  ( 1  +  1 )
21oveq2i 6096 . . . 4  |-  ( 4  +  2 )  =  ( 4  +  ( 1  +  1 ) )
3 4cn 9383 . . . . 5  |-  4  e.  CC
4 ax-1cn 8272 . . . . 5  |-  1  e.  CC
53, 4, 4addassi 8334 . . . 4  |-  ( ( 4  +  1 )  +  1 )  =  ( 4  +  ( 1  +  1 ) )
62, 5eqtr4i 2262 . . 3  |-  ( 4  +  2 )  =  ( ( 4  +  1 )  +  1 )
7 df-5 9367 . . . 4  |-  5  =  ( 4  +  1 )
87oveq1i 6095 . . 3  |-  ( 5  +  1 )  =  ( ( 4  +  1 )  +  1 )
96, 8eqtr4i 2262 . 2  |-  ( 4  +  2 )  =  ( 5  +  1 )
10 df-6 9368 . 2  |-  6  =  ( 5  +  1 )
119, 10eqtr4i 2262 1  |-  ( 4  +  2 )  =  6
Colors of variables:    wff set class
This proof depends on syntax axioms:    = wceq 1402  (class class class)co 6085   1c1 8180    + caddc 8182   2c2 9356   4c4 9358   5c5 9359   6c6 9360
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220  ax-resscn 8271  ax-1cn 8272  ax-1re 8273  ax-addrcl 8276  ax-addass 8281
This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-rex 2534  df-v 2823  df-un 3224  df-in 3226  df-ss 3233  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-br 4131  df-iota 5337  df-fv 5385  df-ov 6088  df-2 9364  df-3 9365  df-4 9366  df-5 9367  df-6 9368
This theorem is used by:  4p3e7  9450  div4p1lem1div2  9561  4t4e16  9877  6gcd4e2  12774  2exp16  13218
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