0. Notations

Notations	Meaning
\(X\)	\(X\) is a real number
\(\bar X\)	\(\bar X\) is a complex number
\(\bar X^*\)	The conjugate complex of \(\bar X\)
\(\Re(\bar X)\)	The real part of \(\bar X\)
\(\Im(\bar X)\)	The imaginary part of \(\bar X\)

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