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Theorem 4p2e6 9290
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 9205 . . . . 5  |-  2  =  ( 1  +  1 )
21oveq2i 6032 . . . 4  |-  ( 4  +  2 )  =  ( 4  +  ( 1  +  1 ) )
3 4cn 9224 . . . . 5  |-  4  e.  CC
4 ax-1cn 8128 . . . . 5  |-  1  e.  CC
53, 4, 4addassi 8190 . . . 4  |-  ( ( 4  +  1 )  +  1 )  =  ( 4  +  ( 1  +  1 ) )
62, 5eqtr4i 2255 . . 3  |-  ( 4  +  2 )  =  ( ( 4  +  1 )  +  1 )
7 df-5 9208 . . . 4  |-  5  =  ( 4  +  1 )
87oveq1i 6031 . . 3  |-  ( 5  +  1 )  =  ( ( 4  +  1 )  +  1 )
96, 8eqtr4i 2255 . 2  |-  ( 4  +  2 )  =  ( 5  +  1 )
10 df-6 9209 . 2  |-  6  =  ( 5  +  1 )
119, 10eqtr4i 2255 1  |-  ( 4  +  2 )  =  6
Colors of variables: wff set class
Syntax hints:    = wceq 1397  (class class class)co 6021   1c1 8036    + caddc 8038   2c2 9197   4c4 9199   5c5 9200   6c6 9201
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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-ext 2213  ax-resscn 8127  ax-1cn 8128  ax-1re 8129  ax-addrcl 8132  ax-addass 8137
This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-rex 2516  df-v 2804  df-un 3204  df-in 3206  df-ss 3213  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-br 4089  df-iota 5286  df-fv 5334  df-ov 6024  df-2 9205  df-3 9206  df-4 9207  df-5 9208  df-6 9209
This theorem is referenced by:  4p3e7  9291  div4p1lem1div2  9401  4t4e16  9712  6gcd4e2  12587  2exp16  13031
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