In mathematics, an O*-algebra is an algebra of possibly unbounded operators defined on a dense subspace of a Hilbert space. The original examples were described by and , who studied some examples of O*-algebras, called Borchers algebras, arising from the Wightman axioms of quantum field theory. and began the systematic study of algebras of unbounded operators.
Borchers algebras are a type of O*-algebra
( z1 algebra :mod ( z2 type :mod ( z3 variable :name ( z4 name :op "O*-algebra" ) ) ) :domain ( z5 algebra :mod ( z6 person :name ( z7 name :op "Boris" ) ) ) )