We deal with the Finite Element Tearing and Interconnecting Dual Primal
(FETI-DP) preconditioner for elliptic problems discretized by the virtual
element method (VEM). We extend the result of [16] to the three dimensional
case. We prove polylogarithmic condition number bounds, independent of the
number of subdomains, the mesh size, and jumps in the diffusion coefficients.
Numerical experiments validate the theoryComment: 28 page
