]> https://gitweb.dealii.org/ - dealii-svn.git/commitdiff
Fix math error.
authorbangerth <bangerth@0785d39b-7218-0410-832d-ea1e28bc413d>
Sat, 15 Aug 2009 01:45:20 +0000 (01:45 +0000)
committerbangerth <bangerth@0785d39b-7218-0410-832d-ea1e28bc413d>
Sat, 15 Aug 2009 01:45:20 +0000 (01:45 +0000)
git-svn-id: https://svn.dealii.org/trunk@19271 0785d39b-7218-0410-832d-ea1e28bc413d

deal.II/doc/doxygen/headers/multithreading.h

index 97a11df06dc6da766e7fe62a64ef7eae0065ed1f..58a4e10f4d08e765c9e9dcc9755ac3df7c840ac4 100644 (file)
  *   point where we want to copy the local into the global contributions the
  *   order is still as if we computed things sequentially. In other words, it
  *   may happen that we add the contributions of cell 1 before those of cell
- *   0. That may seem harmless because addition is commutative, but in fact it
+ *   0. That may seem harmless because addition is commutative and
+ *   associative, but in fact it 
  *   is not if done in floating point arithmetic: $a+b+c \neq a+c+b$ -- take
  *   for example $a=1, b=-1, c=10^{-20}$ (because $1+10^{-20}=1$ in floating
  *   point arithmetic, using double precision).

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