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Theorem addcani 8076
Description: Cancellation law for addition. Theorem I.1 of [Apostol] p. 18. (Contributed by NM, 27-Oct-1999.) (Revised by Scott Fenton, 3-Jan-2013.)
Hypotheses
Ref Expression
addcani.1  |-  A  e.  CC
addcani.2  |-  B  e.  CC
addcani.3  |-  C  e.  CC
Assertion
Ref Expression
addcani  |-  ( ( A  +  B )  =  ( A  +  C )  <->  B  =  C )

Proof of Theorem addcani
StepHypRef Expression
1 addcani.1 . 2  |-  A  e.  CC
2 addcani.2 . 2  |-  B  e.  CC
3 addcani.3 . 2  |-  C  e.  CC
4 addcan 8074 . 2  |-  ( ( A  e.  CC  /\  B  e.  CC  /\  C  e.  CC )  ->  (
( A  +  B
)  =  ( A  +  C )  <->  B  =  C ) )
51, 2, 3, 4mp3an 1327 1  |-  ( ( A  +  B )  =  ( A  +  C )  <->  B  =  C )
Colors of variables: wff set class
Syntax hints:    <-> wb 104    = wceq 1343    e. wcel 2136  (class class class)co 5841   CCcc 7747    + caddc 7752
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-ext 2147  ax-resscn 7841  ax-1cn 7842  ax-icn 7844  ax-addcl 7845  ax-addrcl 7846  ax-mulcl 7847  ax-addcom 7849  ax-addass 7851  ax-distr 7853  ax-i2m1 7854  ax-0id 7857  ax-rnegex 7858  ax-cnre 7860
This theorem depends on definitions:  df-bi 116  df-3an 970  df-tru 1346  df-nf 1449  df-sb 1751  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2296  df-ral 2448  df-rex 2449  df-v 2727  df-un 3119  df-in 3121  df-ss 3128  df-sn 3581  df-pr 3582  df-op 3584  df-uni 3789  df-br 3982  df-iota 5152  df-fv 5195  df-ov 5844
This theorem is referenced by:  negdii  8178  fsumrelem  11408
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