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Theorem 4p4e8 12397
Description: 4 + 4 = 8. (Contributed by NM, 11-May-2004.)
Assertion
Ref Expression
4p4e8 (4 + 4) = 8

Proof of Theorem 4p4e8
StepHypRef Expression
1 df-4 12307 . . . 4 4 = (3 + 1)
21oveq2i 7431 . . 3 (4 + 4) = (4 + (3 + 1))
3 4cn 12327 . . . 4 4 ∈ ℂ
4 3cn 12323 . . . 4 3 ∈ ℂ
5 ax-1cn 11196 . . . 4 1 ∈ ℂ
63, 4, 5addassi 11254 . . 3 ((4 + 3) + 1) = (4 + (3 + 1))
72, 6eqtr4i 2759 . 2 (4 + 4) = ((4 + 3) + 1)
8 df-8 12311 . . 3 8 = (7 + 1)
9 4p3e7 12396 . . . 4 (4 + 3) = 7
109oveq1i 7430 . . 3 ((4 + 3) + 1) = (7 + 1)
118, 10eqtr4i 2759 . 2 8 = ((4 + 3) + 1)
127, 11eqtr4i 2759 1 (4 + 4) = 8
Colors of variables: wff setvar class
Syntax hints:   = wceq 1534  (class class class)co 7420  1c1 11139   + caddc 11141  3c3 12298  4c4 12299  7c7 12302  8c8 12303
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1790  ax-4 1804  ax-5 1906  ax-6 1964  ax-7 2004  ax-8 2101  ax-9 2109  ax-ext 2699  ax-1cn 11196  ax-addcl 11198  ax-addass 11203
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 847  df-3an 1087  df-tru 1537  df-fal 1547  df-ex 1775  df-sb 2061  df-clab 2706  df-cleq 2720  df-clel 2806  df-rab 3430  df-v 3473  df-dif 3950  df-un 3952  df-in 3954  df-ss 3964  df-nul 4324  df-if 4530  df-sn 4630  df-pr 4632  df-op 4636  df-uni 4909  df-br 5149  df-iota 6500  df-fv 6556  df-ov 7423  df-2 12305  df-3 12306  df-4 12307  df-5 12308  df-6 12309  df-7 12310  df-8 12311
This theorem is referenced by:  4t2e8  12410  83prm  17091  1259lem2  17100  1259lem3  17101  2503lem2  17106  4001lem2  17110  quart1lem  26786  log2ub  26880  hgt750lem2  34284  3exp7  41524  3lexlogpow5ineq1  41525  3cubeslem3r  42107
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