Definition 27.2.3 (Covering Ratio).label Let $G$ be a locally compact group and $f, g \in C_{c}^{+}(G)$, then
\[(f: g) = \inf\bracs{\sum_{j = 1}^n c_j \bigg | \seqf{c_j} \subset [0, \infty), \seqf{x_j} \subset G, f \le \sum_{j = 1}^n c_j L_{x_j}g}\]
is the covering ratio of $f$ by $g$.
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