Calculus of twisted vertex operators.
Starting from an arbitrary isometry of an arbitrary even lattice, twisted and shifted vertex operators are introduced. Under commutators, these operators provide realizations of twisted affine Lie algebras. This construction, generalizing a number of known ones, is based on a self-contained "calculus."
Lepowsky
J
J
Department of Mathematics, Rutgers University, New Brunswick, NJ 08903.