Two new algorithms, AugmentedGreedy and RandomizedRounding, give the first unconditional m-approximation and a simple O(n log n)-approximation for the most general decoupled freeform spanner problem.
Approximation algorithms for directed weighted spanners
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Simple Approximations for General Spanner Problems
Two new algorithms, AugmentedGreedy and RandomizedRounding, give the first unconditional m-approximation and a simple O(n log n)-approximation for the most general decoupled freeform spanner problem.