Notation

As the context and convention permits, small Roman and Greek letters
are used for scalars, small Roman boldface letters for vectors,
capital Roman boldface for matrices, and capital Greek for
functions. Letters early in the alphabet tend to indicate constants
and letters towards the end indicate variables. Capital caligraphs
indicate sets and their cardinality.
is
the norm and bracketed super-scripts are indices rather than the
power function. The letters , , are in general scalars and
refer to particular versions of , , ,
respectively.
denotes the identity matrix,
and
are the vector / matrix equivalents to 0 and 1.
is the Landau symbol. For a
matrix
, refers to the element at the -th row and
-th column and
(
) is the
-th
*column* (
*row*) vector of
.
denotes the transpose of
. The set of real numbers is
, the set of
non-negative (strictly positive) real numbers is
(
).

Alexander Strehl 2002-05-03