2 problems

Let $M$ be a compact quaternionic contact manifold that is locally non-flat in the conformal quaternionic contact sense. Let $\lambda(M)$ denote its qc Yamabe constant, and let…

Let $S^{4n+3}$ be the standard unit $(4n+3)$-dimensional quaternionic sphere with its standard quaternionic contact structure and standard 3-Sasaki structure. Its qc-scalar curvatu…