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Theorem 6p2e8 8869
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 8779 . . . . 5 2 = (1 + 1)
21oveq2i 5785 . . . 4 (6 + 2) = (6 + (1 + 1))
3 6cn 8802 . . . . 5 6 ∈ ℂ
4 ax-1cn 7713 . . . . 5 1 ∈ ℂ
53, 4, 4addassi 7774 . . . 4 ((6 + 1) + 1) = (6 + (1 + 1))
62, 5eqtr4i 2163 . . 3 (6 + 2) = ((6 + 1) + 1)
7 df-7 8784 . . . 4 7 = (6 + 1)
87oveq1i 5784 . . 3 (7 + 1) = ((6 + 1) + 1)
96, 8eqtr4i 2163 . 2 (6 + 2) = (7 + 1)
10 df-8 8785 . 2 8 = (7 + 1)
119, 10eqtr4i 2163 1 (6 + 2) = 8
Colors of variables: wff set class
Syntax hints:   = wceq 1331  (class class class)co 5774  1c1 7621   + caddc 7623  2c2 8771  6c6 8775  7c7 8776  8c8 8777
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2121  ax-resscn 7712  ax-1cn 7713  ax-1re 7714  ax-addrcl 7717  ax-addass 7722
This theorem depends on definitions:  df-bi 116  df-3an 964  df-tru 1334  df-nf 1437  df-sb 1736  df-clab 2126  df-cleq 2132  df-clel 2135  df-nfc 2270  df-rex 2422  df-v 2688  df-un 3075  df-in 3077  df-ss 3084  df-sn 3533  df-pr 3534  df-op 3536  df-uni 3737  df-br 3930  df-iota 5088  df-fv 5131  df-ov 5777  df-2 8779  df-3 8780  df-4 8781  df-5 8782  df-6 8783  df-7 8784  df-8 8785
This theorem is referenced by:  6p3e9  8870  6t3e18  9286
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