APPENDIX Mathematical Complements
Important mathematical concepts are reviewed without proof. Sections A.1 through A.5 we present results of real and complex analysis, including properties of Hilbert spaces, bases, and linear operators [59]. Random vectors and Dirac distributions are covered in the last two sections.
A.1 FUNCTIONS AND INTEGRATION
Analog signals are modeled by measurable functions. We first give the main theorems of Lebesgue integration. A function f is said to be integrable if 
. The space of integrable functions is written as . Two functions f1 and f2 are equal in if
This means that f1(t) and f2(t) can differ only on a set ...
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