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Theorem 4p3e7 9278
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 9193 . . . 4 3 = (2 + 1)
21oveq2i 6024 . . 3 (4 + 3) = (4 + (2 + 1))
3 4cn 9211 . . . 4 4 ∈ ℂ
4 2cn 9204 . . . 4 2 ∈ ℂ
5 ax-1cn 8115 . . . 4 1 ∈ ℂ
63, 4, 5addassi 8177 . . 3 ((4 + 2) + 1) = (4 + (2 + 1))
72, 6eqtr4i 2253 . 2 (4 + 3) = ((4 + 2) + 1)
8 df-7 9197 . . 3 7 = (6 + 1)
9 4p2e6 9277 . . . 4 (4 + 2) = 6
109oveq1i 6023 . . 3 ((4 + 2) + 1) = (6 + 1)
118, 10eqtr4i 2253 . 2 7 = ((4 + 2) + 1)
127, 11eqtr4i 2253 1 (4 + 3) = 7
Colors of variables: wff set class
Syntax hints:   = wceq 1395  (class class class)co 6013  1c1 8023   + caddc 8025  2c2 9184  3c3 9185  4c4 9186  6c6 9188  7c7 9189
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 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-ext 2211  ax-resscn 8114  ax-1cn 8115  ax-1re 8116  ax-addrcl 8119  ax-addass 8124
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-rex 2514  df-v 2802  df-un 3202  df-in 3204  df-ss 3211  df-sn 3673  df-pr 3674  df-op 3676  df-uni 3892  df-br 4087  df-iota 5284  df-fv 5332  df-ov 6016  df-2 9192  df-3 9193  df-4 9194  df-5 9195  df-6 9196  df-7 9197
This theorem is referenced by:  4p4e8  9279  2lgslem3d  15815  2lgsoddprmlem3d  15829
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