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Theorem 5p2e7 9383
Description: 5 + 2 = 7. (Contributed by NM, 11-May-2004.)
Assertion
Ref Expression
5p2e7 (5 + 2) = 7

Proof of Theorem 5p2e7
StepHypRef Expression
1 df-2 9295 . . . . 5 2 = (1 + 1)
21oveq2i 6060 . . . 4 (5 + 2) = (5 + (1 + 1))
3 5cn 9316 . . . . 5 5 ∈ ℂ
4 ax-1cn 8219 . . . . 5 1 ∈ ℂ
53, 4, 4addassi 8281 . . . 4 ((5 + 1) + 1) = (5 + (1 + 1))
62, 5eqtr4i 2256 . . 3 (5 + 2) = ((5 + 1) + 1)
7 df-6 9299 . . . 4 6 = (5 + 1)
87oveq1i 6059 . . 3 (6 + 1) = ((5 + 1) + 1)
96, 8eqtr4i 2256 . 2 (5 + 2) = (6 + 1)
10 df-7 9300 . 2 7 = (6 + 1)
119, 10eqtr4i 2256 1 (5 + 2) = 7
Colors of variables: wff set class
Syntax hints:   = wceq 1398  (class class class)co 6049  1c1 8127   + caddc 8129  2c2 9287  5c5 9290  6c6 9291  7c7 9292
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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2214  ax-resscn 8218  ax-1cn 8219  ax-1re 8220  ax-addrcl 8223  ax-addass 8228
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-rex 2526  df-v 2814  df-un 3214  df-in 3216  df-ss 3223  df-sn 3694  df-pr 3695  df-op 3697  df-uni 3914  df-br 4109  df-iota 5311  df-fv 5359  df-ov 6052  df-2 9295  df-3 9296  df-4 9297  df-5 9298  df-6 9299  df-7 9300
This theorem is referenced by:  5p3e8  9384
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