Proceedings of the Logic Colloquium. Held in Aachen, July 18-23, 1983

Filters and ultrafilters over definable subsets of admissible ordinals.- Superinfinitesimals and the calculus of the generalized riemann integral.- Point-picking games and HFD's.- On homomorphism types of superatomic interval Boolean algebras.- Dectdable theories of pseudo-Algebraically closed fields.- Definability in power series rings of nonzero characteristic.- Convexity properties and algebraic closure operators.- Remarks on finitely based logics.- Monadicity in topological pseudo-boolean algebras.- Finite extensions of finite groups.- Constructing choice sequences from lawless sequences of neighbourhood functions.- Partitions and homogeneous sets for admissible ordinals.- Elimination of quantifiers for the theory of Archimedean ordered divisible groups in a logic with Ramsey quantifiers.- A proof-theoretic approach to non standard analysis (continued).- Interpretations and the model theory of the classical geometries.- On cantor-bendixson spectra containing (1,1) ¿ I.- Abstract model-theory and nets of C*-algebras: Noncommutative interpolation and preservation properties.- A contribution to nonstandard teratology.- Model- and substructure complete theories of ordered Abelian groups.- Quantifier elimination and decision procedures for valued fields.- On ? 3 1 .