HALF-STRING OSCILLATOR APPROACH TO STRING FIELD-THEORY (GHOST SECTOR-I)

String fields can be viewed as infinite matrices whose row and column indices are designated by the left and right parts of the string for b oth the orbital and ghost coordinates. In this way string field theory takes a form in which string interactions are given by matrix multipl ication and trace. We formulate the ghost sector of the theory in the bosonic representation, thus constructing the form of the interaction vertex. The K(N) symmetries of the 1-vertex (integration) and the 3-ve rtex of the theory are discussed.