On Yuri Gurevich -- Yuri, Logic, and Computer Science -- Database Theory, Yuri, and Me -- Technical Papers -- Tracking Evidence -- Strict Canonical Constructive Systems -- Decidable Expansions of Labelled Linear Orderings -- Existential Fixed-Point Logic, Universal Quantifiers, and Topoi -- Three Paths to Effectiveness -- The Quest for a Tight Translation of Büchi to co-Büchi Automata -- Normalization of Some Extended Abstract State Machines -- Finding Reductions Automatically -- On Complete Problems, Relativizations and Logics for Complexity Classes -- Effective Closed Subshifts in 1D Can Be Implemented in 2D -- The Model Checking Problem for Prefix Classes of Second-Order Logic: A Survey -- A Logic for PTIME and a Parameterized Halting Problem -- Inferring Loop Invariants Using Postconditions -- ASMs and Operational Algorithmic Completeness of Lambda Calculus -- Fixed-Point Definability and Polynomial Time on Chordal Graphs and Line Graphs -- Ibn S?n? on Analysis: 1. Proof Search. Or: Abstract State Machines as a Tool for History of Logic -- Abstract State Machines and the Inquiry Process -- The Algebra of Adjacency Patterns: Rees Matrix Semigroups with Reversion -- Definability of Combinatorial Functions and Their Linear Recurrence Relations -- Halting and Equivalence of Program Schemes in Models of Arbitrary Theories -- Metrization Theorem for Space-Times: From Urysohn’s Problem towards Physically Useful Constructive Mathematics -- Thirteen Definitions of a Stable Model -- DKAL and Z3: A Logic Embedding Experiment -- Decidability of the Class E by Maslov’s Inverse Method -- Logics for Two Fragments beyond the Syllogistic Boundary -- Choiceless Computation and Symmetry -- Hereditary Zero-One Laws for Graphs -- On Monadic Theories of Monadic Predicates.

This Festschrift volume, published in honor of Yuri Gurevich on the occasion of his 70th birthday, contains contributions, written by his colleagues. The collection of articles herein begins with an academic biography, an annotated list of Yuri's publications and reports, and a personal tribute by Jan Van den Bussche. These are followed by 28 technical contributions. These articles - though they cover a broad range of topics - represent only a fraction of Yuri Gurevich’s multiple areas of interest.