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Theorem 4p3e7 9449
Description: 4 + 3 = 7. (Contributed by NM, 11-May-2004.)
Assertion
Ref Expression
4p3e7 (4 + 3) = 7

Proof of Theorem 4p3e7
StepHypRef Expression
1 df-3 9364 . . . 4 3 = (2 + 1)
21oveq2i 6096 . . 3 (4 + 3) = (4 + (2 + 1))
3 4cn 9382 . . . 4 4 ∈ ℂ
4 2cn 9375 . . . 4 2 ∈ ℂ
5 ax-1cn 8272 . . . 4 1 ∈ ℂ
63, 4, 5addassi 8334 . . 3 ((4 + 2) + 1) = (4 + (2 + 1))
72, 6eqtr4i 2262 . 2 (4 + 3) = ((4 + 2) + 1)
8 df-7 9368 . . 3 7 = (6 + 1)
9 4p2e6 9448 . . . 4 (4 + 2) = 6
109oveq1i 6095 . . 3 ((4 + 2) + 1) = (6 + 1)
118, 10eqtr4i 2262 . 2 7 = ((4 + 2) + 1)
127, 11eqtr4i 2262 1 (4 + 3) = 7
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  3c3 9356  4c4 9357  6c6 9359  7c7 9360
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
This theorem is used by:  4p4e8  9450  log2ublog2  16086  2lgslem3d  16215  2lgsoddprmlem3d  16229
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