IN ref.[1]of § 20,Ye Yanqian has investigated the impossibility of(2,2)distribution of lim-it cycles of quadratic systems,where the footnote 1)on p.553 gives
THROUGHOUT this note, the following notations are used: For a matrix A, A】0 means thatA is positive definite symmetric; R (A), A′and A<sup>-</sup> stand for the
IT is well known that it is impossible to construct an integral representation of holomorphic functions with holomorphic kernel for the general bounded domain.