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Theorem 8p2e10 9856
Description: 8 + 2 = 10. (Contributed by NM, 5-Feb-2007.) (Revised by Stanislas Polu, 7-Apr-2020.) (Revised by AV, 6-Sep-2021.)
Assertion
Ref Expression
8p2e10  |-  ( 8  +  2 )  = ; 1
0

Proof of Theorem 8p2e10
StepHypRef Expression
1 df-2 9363 . . . 4  |-  2  =  ( 1  +  1 )
21oveq2i 6096 . . 3  |-  ( 8  +  2 )  =  ( 8  +  ( 1  +  1 ) )
3 8cn 9390 . . . 4  |-  8  e.  CC
4 ax-1cn 8272 . . . 4  |-  1  e.  CC
53, 4, 4addassi 8334 . . 3  |-  ( ( 8  +  1 )  +  1 )  =  ( 8  +  ( 1  +  1 ) )
62, 5eqtr4i 2262 . 2  |-  ( 8  +  2 )  =  ( ( 8  +  1 )  +  1 )
7 df-9 9370 . . 3  |-  9  =  ( 8  +  1 )
87oveq1i 6095 . 2  |-  ( 9  +  1 )  =  ( ( 8  +  1 )  +  1 )
9 9p1e10 9779 . 2  |-  ( 9  +  1 )  = ; 1
0
106, 8, 93eqtr2i 2265 1  |-  ( 8  +  2 )  = ; 1
0
Colors of variables:    wff set class
This proof depends on syntax axioms:    = wceq 1402  (class class class)co 6085   0cc0 8179   1c1 8180    + caddc 8182   2c2 9355   8c8 9361   9c9 9362  ;cdc 9777
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220  ax-sep 4249  ax-cnex 8270  ax-resscn 8271  ax-1cn 8272  ax-1re 8273  ax-icn 8274  ax-addcl 8275  ax-addrcl 8276  ax-mulcl 8277  ax-mulcom 8280  ax-addass 8281  ax-mulass 8282  ax-distr 8283  ax-1rid 8286  ax-0id 8287  ax-cnre 8290
This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-rab 2537  df-v 2823  df-un 3224  df-in 3226  df-ss 3233  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-int 3971  df-br 4131  df-iota 5337  df-fv 5385  df-ov 6088  df-inn 9305  df-2 9363  df-3 9364  df-4 9365  df-5 9366  df-6 9367  df-7 9368  df-8 9369  df-9 9370  df-dec 9778
This theorem is used by:  8p3e11  9857  8t5e40  9894
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