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Theorem 5p2e7 9183
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 9095 . . . . 5 2 = (1 + 1)
21oveq2i 5955 . . . 4 (5 + 2) = (5 + (1 + 1))
3 5cn 9116 . . . . 5 5 ∈ ℂ
4 ax-1cn 8018 . . . . 5 1 ∈ ℂ
53, 4, 4addassi 8080 . . . 4 ((5 + 1) + 1) = (5 + (1 + 1))
62, 5eqtr4i 2229 . . 3 (5 + 2) = ((5 + 1) + 1)
7 df-6 9099 . . . 4 6 = (5 + 1)
87oveq1i 5954 . . 3 (6 + 1) = ((5 + 1) + 1)
96, 8eqtr4i 2229 . 2 (5 + 2) = (6 + 1)
10 df-7 9100 . 2 7 = (6 + 1)
119, 10eqtr4i 2229 1 (5 + 2) = 7
Colors of variables: wff set class
Syntax hints:   = wceq 1373  (class class class)co 5944  1c1 7926   + caddc 7928  2c2 9087  5c5 9090  6c6 9091  7c7 9092
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 1470  ax-7 1471  ax-gen 1472  ax-ie1 1516  ax-ie2 1517  ax-8 1527  ax-10 1528  ax-11 1529  ax-i12 1530  ax-bndl 1532  ax-4 1533  ax-17 1549  ax-i9 1553  ax-ial 1557  ax-i5r 1558  ax-ext 2187  ax-resscn 8017  ax-1cn 8018  ax-1re 8019  ax-addrcl 8022  ax-addass 8027
This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1484  df-sb 1786  df-clab 2192  df-cleq 2198  df-clel 2201  df-nfc 2337  df-rex 2490  df-v 2774  df-un 3170  df-in 3172  df-ss 3179  df-sn 3639  df-pr 3640  df-op 3642  df-uni 3851  df-br 4045  df-iota 5232  df-fv 5279  df-ov 5947  df-2 9095  df-3 9096  df-4 9097  df-5 9098  df-6 9099  df-7 9100
This theorem is referenced by:  5p3e8  9184
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