Notation

$x$	...	Scalar
${\ensuremath{\mathitbf{x}}}$	...	Vector
$\hat{x}$	...	Tensor
$\mathcal{X}$	...	Operator
$\ensuremath{{\underaccent{\bar}{A}}}$	...	Matrix
$A_{ij}$	...	Elements of the matrix ${\underaccent{\bar}{A}}$
${\ensuremath{\mathitbf{x}}} \cdot {\ensuremath{\mathitbf{y}}}$	...	Scalar product
$[hk\ell]$	...	Miller indices to specify a crystal direction
$\langle hk\ell\rangle$	...	Miller indices to specify equivalent crystal directions
$(hk\ell)$	...	Miller indices to specify a crystal plane
$\{hk\ell\}$	...	Miller indices to specify equivalent crystal planes

E. Ungersboeck: Advanced Modelling Aspects of Modern Strained CMOS Technology