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We study the unweighted Tree Augmentation Problem (TAP) via the Lasserre (Sumof Squares) system. We prove an approximation guarantee of ($1.8+\epsilon$)relative to an SDP relaxation, which matches the combinatorial approximationguarantee of Even, Feldman, Kortsarz and Nutov in ACM TALG (2009), where$\epsilon>0$ is a constant. We generalize the combinatorial analysis ofintegral solutions of Even, et al., to fractional solutions by identifying someproperties of fractional solutions of the Lasserre system via the decompositionresult of Rothvo{\ss} (arXiv:1111.5473, 2011) and Karlin, Mathieu and Nguyen(IPCO 2011).

Approximating (Unweighted) Tree Augmentation via Lift-and-Project (Part 0: $1.8+\epsilon$ approximation for (Unweighted) TAP)