Let $X$, $Y$, and $Z$ each be a D202: Random variable such that
| (i) | $X \to Y \to Z$ is a D3348: Markov chain |
Then
| (1) | \begin{equation} I(X; Y) \geq I(X; Z) \end{equation} |
| (2) | \begin{equation} I(X; Y) = I(X; Z) \quad \iff \quad I(X; Y \mid Z) = 0 \end{equation} |