  The Yang-Lee edge singularity is investigated by the determinant method of
the conformal field theory. The critical dimension Dc, for which the scale
dimension of scalar Delta_phi is vanishing, is discussed by this determinant
method. The result is incorporated in the Pade analysis of epsilon expansion,
which leads to an estimation of the value Delta_phi between three and six
dimensions. The structure of the minors is viewed from the fixed points.
