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Theorem 4p2e6 8242
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 8165 . . . . 5  |-  2  =  ( 1  +  1 )
21oveq2i 5554 . . . 4  |-  ( 4  +  2 )  =  ( 4  +  ( 1  +  1 ) )
3 4cn 8184 . . . . 5  |-  4  e.  CC
4 ax-1cn 7131 . . . . 5  |-  1  e.  CC
53, 4, 4addassi 7189 . . . 4  |-  ( ( 4  +  1 )  +  1 )  =  ( 4  +  ( 1  +  1 ) )
62, 5eqtr4i 2105 . . 3  |-  ( 4  +  2 )  =  ( ( 4  +  1 )  +  1 )
7 df-5 8168 . . . 4  |-  5  =  ( 4  +  1 )
87oveq1i 5553 . . 3  |-  ( 5  +  1 )  =  ( ( 4  +  1 )  +  1 )
96, 8eqtr4i 2105 . 2  |-  ( 4  +  2 )  =  ( 5  +  1 )
10 df-6 8169 . 2  |-  6  =  ( 5  +  1 )
119, 10eqtr4i 2105 1  |-  ( 4  +  2 )  =  6
Colors of variables: wff set class
Syntax hints:    = wceq 1285  (class class class)co 5543   1c1 7044    + caddc 7046   2c2 8156   4c4 8158   5c5 8159   6c6 8160
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 663  ax-5 1377  ax-7 1378  ax-gen 1379  ax-ie1 1423  ax-ie2 1424  ax-8 1436  ax-10 1437  ax-11 1438  ax-i12 1439  ax-bndl 1440  ax-4 1441  ax-17 1460  ax-i9 1464  ax-ial 1468  ax-i5r 1469  ax-ext 2064  ax-resscn 7130  ax-1cn 7131  ax-1re 7132  ax-addrcl 7135  ax-addass 7140
This theorem depends on definitions:  df-bi 115  df-3an 922  df-tru 1288  df-nf 1391  df-sb 1687  df-clab 2069  df-cleq 2075  df-clel 2078  df-nfc 2209  df-rex 2355  df-v 2604  df-un 2978  df-in 2980  df-ss 2987  df-sn 3412  df-pr 3413  df-op 3415  df-uni 3610  df-br 3794  df-iota 4897  df-fv 4940  df-ov 5546  df-2 8165  df-3 8166  df-4 8167  df-5 8168  df-6 8169
This theorem is referenced by:  4p3e7  8243  div4p1lem1div2  8351  4t4e16  8656  6gcd4e2  10528
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