Clarify tensor type definitions a bit

git-svn-id: http://svn.cactuscode.org/arrangements/CactusBase/SymBase/trunk@33 906471b6-c639-44d1-9ea0-3e3d6879f074

1 files changed, 7 insertions, 4 deletions

diff --git a/doc/documentation.tex b/doc/documentation.tex
index 4ce0fb3..d1ddc3b 100644
--- a/doc/documentation.tex
+++ b/doc/documentation.tex
@@ -567,10 +567,13 @@ currently known and supported:
 (More tensor type aliases are likely to be defined in the future.)
 
 In addition to the tensor type, one can also declare the \emph{tensor
-weight} and a \emph{tensor metric}.  The tensor weight specifies the
-behaviour under transformations that change the volume element.  The
-tensor metric specifies what metric has to be used to raise or lower
-indices for that quantity.
+  parity}, \emph{tensor weight}, and a \emph{tensor metric}.  The
+tensor parity (an integer) specifies the behaviour under reflections.
+Scalars and polar vectors have a parity $+1$, pseudo scalars and axial
+vectors have a parity $-1$.  The tensor weight (a real number)
+specifies the behaviour under transformations that change the volume
+element.  The tensor metric (a string) specifies what metric has to be
+used to raise or lower indices for that quantity.
 
 Last but not least, a \emph{tensor special} can be defined for
 quantities that do not transform as tensor.  The currently supported