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Theorem 4p3e7 9287
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 9202 . . . 4 3 = (2 + 1)
21oveq2i 6028 . . 3 (4 + 3) = (4 + (2 + 1))
3 4cn 9220 . . . 4 4 ∈ ℂ
4 2cn 9213 . . . 4 2 ∈ ℂ
5 ax-1cn 8124 . . . 4 1 ∈ ℂ
63, 4, 5addassi 8186 . . 3 ((4 + 2) + 1) = (4 + (2 + 1))
72, 6eqtr4i 2255 . 2 (4 + 3) = ((4 + 2) + 1)
8 df-7 9206 . . 3 7 = (6 + 1)
9 4p2e6 9286 . . . 4 (4 + 2) = 6
109oveq1i 6027 . . 3 ((4 + 2) + 1) = (6 + 1)
118, 10eqtr4i 2255 . 2 7 = ((4 + 2) + 1)
127, 11eqtr4i 2255 1 (4 + 3) = 7
Colors of variables: wff set class
Syntax hints:   = wceq 1397  (class class class)co 6017  1c1 8032   + caddc 8034  2c2 9193  3c3 9194  4c4 9195  6c6 9197  7c7 9198
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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-ext 2213  ax-resscn 8123  ax-1cn 8124  ax-1re 8125  ax-addrcl 8128  ax-addass 8133
This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-rex 2516  df-v 2804  df-un 3204  df-in 3206  df-ss 3213  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-br 4089  df-iota 5286  df-fv 5334  df-ov 6020  df-2 9201  df-3 9202  df-4 9203  df-5 9204  df-6 9205  df-7 9206
This theorem is referenced by:  4p4e8  9288  2lgslem3d  15824  2lgsoddprmlem3d  15838
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