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Theorem 5p2e7 9332
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 9244 . . . . 5 2 = (1 + 1)
21oveq2i 6039 . . . 4 (5 + 2) = (5 + (1 + 1))
3 5cn 9265 . . . . 5 5 ∈ ℂ
4 ax-1cn 8168 . . . . 5 1 ∈ ℂ
53, 4, 4addassi 8230 . . . 4 ((5 + 1) + 1) = (5 + (1 + 1))
62, 5eqtr4i 2255 . . 3 (5 + 2) = ((5 + 1) + 1)
7 df-6 9248 . . . 4 6 = (5 + 1)
87oveq1i 6038 . . 3 (6 + 1) = ((5 + 1) + 1)
96, 8eqtr4i 2255 . 2 (5 + 2) = (6 + 1)
10 df-7 9249 . 2 7 = (6 + 1)
119, 10eqtr4i 2255 1 (5 + 2) = 7
Colors of variables: wff set class
Syntax hints:   = wceq 1398  (class class class)co 6028  1c1 8076   + caddc 8078  2c2 9236  5c5 9239  6c6 9240  7c7 9241
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 2213  ax-resscn 8167  ax-1cn 8168  ax-1re 8169  ax-addrcl 8172  ax-addass 8177
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-rex 2517  df-v 2805  df-un 3205  df-in 3207  df-ss 3214  df-sn 3679  df-pr 3680  df-op 3682  df-uni 3899  df-br 4094  df-iota 5293  df-fv 5341  df-ov 6031  df-2 9244  df-3 9245  df-4 9246  df-5 9247  df-6 9248  df-7 9249
This theorem is referenced by:  5p3e8  9333
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