Fig. 6From: The effect of transmission variance on observer placement for source-localizationCounterexamples for the submodularity property of Algorithms 1 and 2. For the graph in (a) (respectively, (b)) the gain of adding the node with red border to \(\mathcal {O}_{2}\) is larger in terms of \(\mathcal P_{s}\) (respectively, P L ) than the gain of adding it to \(\mathcal {O}_{1} \subseteq \mathcal {O}_{2}\) Back to article page