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Theorem 6p2e8 9454
Description: 6 + 2 = 8. (Contributed by NM, 11-May-2004.)
Assertion
Ref Expression
6p2e8 (6 + 2) = 8

Proof of Theorem 6p2e8
StepHypRef Expression
1 df-2 9363 . . . . 5 2 = (1 + 1)
21oveq2i 6096 . . . 4 (6 + 2) = (6 + (1 + 1))
3 6cn 9386 . . . . 5 6 ∈ ℂ
4 ax-1cn 8272 . . . . 5 1 ∈ ℂ
53, 4, 4addassi 8334 . . . 4 ((6 + 1) + 1) = (6 + (1 + 1))
62, 5eqtr4i 2262 . . 3 (6 + 2) = ((6 + 1) + 1)
7 df-7 9368 . . . 4 7 = (6 + 1)
87oveq1i 6095 . . 3 (7 + 1) = ((6 + 1) + 1)
96, 8eqtr4i 2262 . 2 (6 + 2) = (7 + 1)
10 df-8 9369 . 2 8 = (7 + 1)
119, 10eqtr4i 2262 1 (6 + 2) = 8
Colors of variables:    wff set class
This proof depends on syntax axioms:   = wceq 1402  (class class class)co 6085  1c1 8180   + caddc 8182  2c2 9355  6c6 9359  7c7 9360  8c8 9361
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 9363  df-3 9364  df-4 9365  df-5 9366  df-6 9367  df-7 9368  df-8 9369
This theorem is used by:  6p3e9  9455  6t3e18  9881  log2ublog2  16086
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