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Following is a list of the notation conventions used in this work. This convention is the result of a compromise between notation styles from the theoretical and applied mathematics and electrical engineering communities in order to keep consistency across the document.

a , A Scalars
H , C Matrices
h , x Vectors
H , X Vectors (typically the frequency domain representation of another vector)
h n , h ( n ) n -th element of vector h (a scalar)
h k Solution for h after k iterations on any given optimization algorithm (a vector)
h Optimal solution vector for a given problem
a i Solution for a at i -th iteration
a k k -th entry of vector a
ω Radial frequency (with period 2 π for discrete signals)
f Linear frequency (related to ω via ω = 2 π f )
F ( · ) Fourier Transform operator
D ( · ) Discrete-time Fourier Transform operator
Z ( · ) Z-Transform operator
* Convolution operator
R Field of real numbers
C Field of complex numbers

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Source:  OpenStax, Iterative design of l_p digital filters. OpenStax CNX. Dec 07, 2011 Download for free at http://cnx.org/content/col11383/1.1
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