Alternating projection method for a class of tensor equations

This paper considers how to solve a class of tensor equations arising from the unified definition of tensor vector products. Of special interest is the order-3 tensor equation whose solutions are the intersection of a group of quadrics from a geometric point of view. Inspired by the method of alternating projections for set intersection problems, we develop a hybrid alternating projection algorithm for solving order-3 tensor equations. The local linear convergence of the alternating projection method is established under suitable conditions. Some numerical experiments are conducted to evaluate the effect of the proposed algorithm. (C) 2018 Elsevier B.V. All rights reserved.