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Theorem 3t3e9 9397
Description: 3 times 3 equals 9. (Contributed by NM, 11-May-2004.)
Assertion
Ref Expression
3t3e9  |-  ( 3  x.  3 )  =  9

Proof of Theorem 3t3e9
StepHypRef Expression
1 df-3 9299 . . 3  |-  3  =  ( 2  +  1 )
21oveq2i 6063 . 2  |-  ( 3  x.  3 )  =  ( 3  x.  (
2  +  1 ) )
3 3cn 9314 . . . . 5  |-  3  e.  CC
4 2cn 9310 . . . . 5  |-  2  e.  CC
5 ax-1cn 8222 . . . . 5  |-  1  e.  CC
63, 4, 5adddii 8286 . . . 4  |-  ( 3  x.  ( 2  +  1 ) )  =  ( ( 3  x.  2 )  +  ( 3  x.  1 ) )
7 3t2e6 9396 . . . . 5  |-  ( 3  x.  2 )  =  6
8 3t1e3 9395 . . . . 5  |-  ( 3  x.  1 )  =  3
97, 8oveq12i 6064 . . . 4  |-  ( ( 3  x.  2 )  +  ( 3  x.  1 ) )  =  ( 6  +  3 )
106, 9eqtri 2255 . . 3  |-  ( 3  x.  ( 2  +  1 ) )  =  ( 6  +  3 )
11 6p3e9 9390 . . 3  |-  ( 6  +  3 )  =  9
1210, 11eqtri 2255 . 2  |-  ( 3  x.  ( 2  +  1 ) )  =  9
132, 12eqtri 2255 1  |-  ( 3  x.  3 )  =  9
Colors of variables: wff set class
Syntax hints:    = wceq 1398  (class class class)co 6052   1c1 8130    + caddc 8132    x. cmul 8134   2c2 9290   3c3 9291   6c6 9294   9c9 9297
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-resscn 8221  ax-1cn 8222  ax-1re 8223  ax-icn 8224  ax-addcl 8225  ax-addrcl 8226  ax-mulcl 8227  ax-mulcom 8230  ax-addass 8231  ax-mulass 8232  ax-distr 8233  ax-1rid 8236  ax-cnre 8240
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-v 2817  df-un 3217  df-in 3219  df-ss 3226  df-sn 3697  df-pr 3698  df-op 3700  df-uni 3917  df-br 4112  df-iota 5314  df-fv 5362  df-ov 6055  df-2 9298  df-3 9299  df-4 9300  df-5 9301  df-6 9302  df-7 9303  df-8 9304  df-9 9305
This theorem is referenced by:  sq3  11002  3dvds  12554  3dvdsdec  12555  3dvds2dec  12556  lgsdir2lem5  15922
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