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arXiv · 1908.00227

An Improved Approximation Algorithm for TSP in the Half Integral Case

Anna Karlin·Nathan Klein·Shayan Oveis Gharan
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Abstract

We design a $1.49993$-approximation algorithm for the metric traveling salesperson problem (TSP) for instances in which an optimal solution to the subtour linear programming relaxation is half-integral. These instances received significant attention over the last decade due to a conjecture of Schalekamp, Williamson and van Zuylen stating that half-integral LP solutions have the largest integrality gap over all fractional solutions. So, if the conjecture of Schalekamp et al. holds true, our result shows that the integrality gap of the subtour polytope is bounded away from $3/2$.

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Anna Karlin, Nathan Klein, Shayan Oveis Gharan. 2019-08-01. An Improved Approximation Algorithm for TSP in the Half Integral Case. https://arxiv.org/abs/1908.00227

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