目录 A Proof for a Graphic Method for Solving the Transportation Problem 1 Automorphisms and Isomorphisms of Linear Groups over Skew Fields 9 Geometry of Classical Groups over Finite Fields and Its Applications 15 Nonlinear Feedforward Sequences of m-sequences I 40 A Linear Algebra Approach to Minimal Convolutional Encoders 62 Representations of Forms by Forms in a Finite Field 105 Geometry of Matrices 136 On the Uniqueness of the Leech Lattice 149 Symplectic Graphs and Their Automorphisms 156 《典型群》序 173 《李代数》序 175 《有限几何与不完全区组设计的一些研究》序 177 《代数和编码》序 179 《非线性移位寄存器》序 183 Geometry of Classical Groups over Finite Fields: Preface 184 Geometry of Matrices: Preface 188 《有限典型群子空间的轨道生成的格》序 190 Lectures on Finite Fields and Galois Rings: Preface 192 Finite Fields and Galois Rings: Preface 194 怀念杨武之老师 196 回忆母校联大附中 199 Hsiao-Fu Tuan, 1914-2005 203 深深怀念陈省身先生 206 中国的代数学 209 忆华罗庚老师1950年回到清华园执教 219