We study the prescribed scalar curvature problem in a conformal class on orbifolds with isolated singularities. prove compactness theorem dimension $4$, and an existence which holds dimensions $n \geq 4$. This is more subtle than manifold case since positive mass does not hold for ALE metrics general. also determine $\rm{U}(2)$-invariant Leray-Schauder degree family of negative-mass found by Le...

We show that results about spaces or moduli of positive scalar curvature metrics proved using index theory can typically be extended to non-negative metrics. illustrate this by providing explicit generalizations some classical concerning