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Theorem 6p3e9 8133
Description: 6 + 3 = 9. (Contributed by NM, 11-May-2004.)
Assertion
Ref Expression
6p3e9 (6 + 3) = 9

Proof of Theorem 6p3e9
StepHypRef Expression
1 df-3 8050 . . . 4 3 = (2 + 1)
21oveq2i 5551 . . 3 (6 + 3) = (6 + (2 + 1))
3 6cn 8072 . . . 4 6 ∈ ℂ
4 2cn 8061 . . . 4 2 ∈ ℂ
5 ax-1cn 7035 . . . 4 1 ∈ ℂ
63, 4, 5addassi 7093 . . 3 ((6 + 2) + 1) = (6 + (2 + 1))
72, 6eqtr4i 2079 . 2 (6 + 3) = ((6 + 2) + 1)
8 df-9 8056 . . 3 9 = (8 + 1)
9 6p2e8 8132 . . . 4 (6 + 2) = 8
109oveq1i 5550 . . 3 ((6 + 2) + 1) = (8 + 1)
118, 10eqtr4i 2079 . 2 9 = ((6 + 2) + 1)
127, 11eqtr4i 2079 1 (6 + 3) = 9
Colors of variables: wff set class
Syntax hints:   = wceq 1259  (class class class)co 5540  1c1 6948   + caddc 6950  2c2 8040  3c3 8041  6c6 8044  8c8 8046  9c9 8047
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 103  ax-ia2 104  ax-ia3 105  ax-io 640  ax-5 1352  ax-7 1353  ax-gen 1354  ax-ie1 1398  ax-ie2 1399  ax-8 1411  ax-10 1412  ax-11 1413  ax-i12 1414  ax-bndl 1415  ax-4 1416  ax-17 1435  ax-i9 1439  ax-ial 1443  ax-i5r 1444  ax-ext 2038  ax-resscn 7034  ax-1cn 7035  ax-1re 7036  ax-addrcl 7039  ax-addass 7044
This theorem depends on definitions:  df-bi 114  df-3an 898  df-tru 1262  df-nf 1366  df-sb 1662  df-clab 2043  df-cleq 2049  df-clel 2052  df-nfc 2183  df-rex 2329  df-v 2576  df-un 2950  df-in 2952  df-ss 2959  df-sn 3409  df-pr 3410  df-op 3412  df-uni 3609  df-br 3793  df-iota 4895  df-fv 4938  df-ov 5543  df-2 8049  df-3 8050  df-4 8051  df-5 8052  df-6 8053  df-7 8054  df-8 8055  df-9 8056
This theorem is referenced by:  3t3e9  8140  6p4e10  8498
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