Complete Problems for Valiant's Class of qp-Computable Families of Polynomials

We prove that the families matrix powering, iterated matrix product, and adjoint matrix are VQP-complete, where VQP denotes Valiant's class of quasipolynomial-computable families of multivariate polynomials. This proves a conjecture by Burgisser [3, Conjecture 8.1].