Years and Authors of Summarized Original Work
SumOriWork: 2013 Chechik
Problem Definition
A spanner is a subgraph of a given graph that faithfully preserves the pairwise distances of that graph. Formally, an \((\alpha ,\beta )\) spanner of a graph G = (V, E) is a subgraph H of G such that for any pair of nodes x, y, \(\mathbf{dist}(x,y,H) \leq \alpha \cdot \mathbf{dist}(x,y,G)+\beta\), where \(\mathbf{dist}(x,y,H^{{\prime}})\) for a subgraph H ′ is the distance of the shortest path from s to t in \(H^{{\prime}}\). We say that the spanner is additive if α = 1, and if in addition β = O(1), we say that the spanner is purely additive. If β = 0, we say that the spanner is multiplicative; otherwise, we say that the spanner is mixed.
Recommended Reading
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Chechik, S. (2014). Additive Spanners. In: Kao, MY. (eds) Encyclopedia of Algorithms. Springer, Boston, MA. https://doi.org/10.1007/978-3-642-27848-8_562-1
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