Definition:Good Rate Function
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Definition
Let $X$ be a topological space.
Let $\overline \R_\ge$ be the positive extended real number line.
Let $I : X \to \overline \R_\ge$ be a rate function.
Then $I$ is good if and only if for all $\alpha \in \R_{\ge 0}$:
- $\operatorname {lev} \limits_{\mathop \le \alpha} I$ is compact
where $\operatorname {lev} \limits_{\mathop \le \alpha} I$ denotes the lower level set of $I$ at $\alpha$.
Sources
- 1998: Amir Dembo and Ofer Zeitouni: Large Deviations Techniques and Applications (2nd ed.): $1.2$ The Large Deviation Principle