Preface

The following morphic characterization of EOL languages is established. The family of EOL languages equals the family of all languages of the form h(L∩R) where h is a morphism, R is a regular language and L is the maximal solution of an equation $\text{?(X) = g(X)}$, where ? is a morphism, g is a coding and X is a language variable. It is shown that if g is allowed to be a weak coding, then a larger family of languages is obtained, which however is strictly contained in the family of ETOL languages.     

Preface

This special issue is dedicated to Professor Shi Zhong-Ci on the occasion of his 80th birthday.Professor Shi was born on December 5,1933,in Ningbo,Zhejiang Province.He completed the undergraduate study in Fudan University in 1955 and had studied computational mathematics in Steklov Institute of Mathematics in Moscow in 1956–1960.Professor Shi has made profound and significant con-     

Preface

<正>This special issue on algebraic geometry contains 12 articles,most of which are invited from the participants of the International ConferenceAlgebraic Geometry in East Asia,which was held at Morningside Center of Mathematics,Academy of Mathematics and Systems Science(AMSS),Chinese Academy of     

Preface

Mathematical Programming - We develop a practical semidefinite programming (SDP) facial reduction procedure that utilizes computationally efficient approximations of the positive semidefinite cone....