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.
A hilbert space is associated with art
It is stated that the hilbert space is related to mathematics and algebra. Therefore, hilbert spaces are associated with math. I think the system got caught off guard because art isn't mentioned at all. 
( z1 associate :ARG1 ( z2 space :mod ( z3 hilbert ) ) :ARG2 ( z4 art ) )