Convergences of Alternating Projections in CAT($\kappa$) Spaces
  We establish the asymptotic regularity and the $\Delta$-convergence of the sequence constructed by the alternating projections to closed convex sets in a CAT($\kappa$) space with $\kappa > 0$. Furthermore, the strong convergence of the alternating von Neumann sequence is presented under certain regularity or compactness. 
Byoung Jin Choi, Un Cig Ji and Yongdo Lim
math.MG