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Theorem 5p2e7 9218
Description: 5 + 2 = 7. (Contributed by NM, 11-May-2004.)
Assertion
Ref Expression
5p2e7 (5 + 2) = 7

Proof of Theorem 5p2e7
StepHypRef Expression
1 df-2 9130 . . . . 5 2 = (1 + 1)
21oveq2i 5978 . . . 4 (5 + 2) = (5 + (1 + 1))
3 5cn 9151 . . . . 5 5 ∈ ℂ
4 ax-1cn 8053 . . . . 5 1 ∈ ℂ
53, 4, 4addassi 8115 . . . 4 ((5 + 1) + 1) = (5 + (1 + 1))
62, 5eqtr4i 2231 . . 3 (5 + 2) = ((5 + 1) + 1)
7 df-6 9134 . . . 4 6 = (5 + 1)
87oveq1i 5977 . . 3 (6 + 1) = ((5 + 1) + 1)
96, 8eqtr4i 2231 . 2 (5 + 2) = (6 + 1)
10 df-7 9135 . 2 7 = (6 + 1)
119, 10eqtr4i 2231 1 (5 + 2) = 7
Colors of variables: wff set class
Syntax hints:   = wceq 1373  (class class class)co 5967  1c1 7961   + caddc 7963  2c2 9122  5c5 9125  6c6 9126  7c7 9127
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 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-ext 2189  ax-resscn 8052  ax-1cn 8053  ax-1re 8054  ax-addrcl 8057  ax-addass 8062
This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1485  df-sb 1787  df-clab 2194  df-cleq 2200  df-clel 2203  df-nfc 2339  df-rex 2492  df-v 2778  df-un 3178  df-in 3180  df-ss 3187  df-sn 3649  df-pr 3650  df-op 3652  df-uni 3865  df-br 4060  df-iota 5251  df-fv 5298  df-ov 5970  df-2 9130  df-3 9131  df-4 9132  df-5 9133  df-6 9134  df-7 9135
This theorem is referenced by:  5p3e8  9219
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