On singular Yamabe obstructions
arXiv:2103.01552 · doi:10.1007/s12220-022-00867-6
Abstract
We discuss the singular Yamabe obstruction of a hypersurface in a four-dimensional general background. We derive various explicit formula for from the original definition. We relate these formulas to corresponding formulas in the literature. The proofs are elementary.
33 pages, corrected typos, added reference