  We show that the dual of the Witt vectors on Z_{\geq 0}^n - 0 as defined by
Angeltveit, Gerhardt, Hill, and Lindenstrauss represent the functor taking a
commutative formal group G to the maps of formal schemes Ahat^n -> G, and that
the Witt vectors are self-dual for Q-algebras or when n=1.
