Algebra and Geometry

. . . . . . . . . . . . . . . . . . . . . . . . Some Aspects of Homological Algebra . Endomorphism Rings . 87 Bibliography . , 91 LATTICE THEORY M. Boolean Algebras . " 111 2. Identity and Defining Relations in Lattices . * . * . Lattices of Congruences and of Ideals of a Lattice . Closure Operators . Drinfel'd Preface .