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Theorem 8p2e10 9806
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 9313 . . . 4  |-  2  =  ( 1  +  1 )
21oveq2i 6069 . . 3  |-  ( 8  +  2 )  =  ( 8  +  ( 1  +  1 ) )
3 8cn 9340 . . . 4  |-  8  e.  CC
4 ax-1cn 8236 . . . 4  |-  1  e.  CC
53, 4, 4addassi 8298 . . 3  |-  ( ( 8  +  1 )  +  1 )  =  ( 8  +  ( 1  +  1 ) )
62, 5eqtr4i 2258 . 2  |-  ( 8  +  2 )  =  ( ( 8  +  1 )  +  1 )
7 df-9 9320 . . 3  |-  9  =  ( 8  +  1 )
87oveq1i 6068 . 2  |-  ( 9  +  1 )  =  ( ( 8  +  1 )  +  1 )
9 9p1e10 9729 . 2  |-  ( 9  +  1 )  = ; 1
0
106, 8, 93eqtr2i 2261 1  |-  ( 8  +  2 )  = ; 1
0
Colors of variables: wff set class
Syntax hints:    = wceq 1398  (class class class)co 6058   0cc0 8143   1c1 8144    + caddc 8146   2c2 9305   8c8 9311   9c9 9312  ;cdc 9727
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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2216  ax-sep 4233  ax-cnex 8234  ax-resscn 8235  ax-1cn 8236  ax-1re 8237  ax-icn 8238  ax-addcl 8239  ax-addrcl 8240  ax-mulcl 8241  ax-mulcom 8244  ax-addass 8245  ax-mulass 8246  ax-distr 8247  ax-1rid 8250  ax-0id 8251  ax-cnre 8254
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ral 2527  df-rex 2528  df-rab 2531  df-v 2817  df-un 3218  df-in 3220  df-ss 3227  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-int 3955  df-br 4115  df-iota 5317  df-fv 5365  df-ov 6061  df-inn 9255  df-2 9313  df-3 9314  df-4 9315  df-5 9316  df-6 9317  df-7 9318  df-8 9319  df-9 9320  df-dec 9728
This theorem is referenced by:  8p3e11  9807  8t5e40  9844
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