Logic -- A ∏01-Bounded Fragment of In nitary Action Logic with Exponential -- Transcendental syntax IV : logic without systems -- Logic and Computing -- A small remark on Hilbert's finitist view of divisibility and Kanovich-Okada-Scedrov's logical analysis of real-time systems -- Logic of fusion -- There's No Time, The Problem of Conceptualising Time -- Andre and the early days of Penn's Logic and Computation Group -- Formal Verification of Ethereum smart contracts using Isabelle/HOL -- Logic and Application - LAP meeting -- Logic and Security -- Formal Methods Analysis of the Secure Remote Password Protocol -- The hitchhiker's guide to decidability and complexity of equivalence properties in security protocols -- Assumption-Based Analysis of Distance-Bounding Protocols with CPSA -- Modelchecking safety properties in randomized security protocols -- Logic and Language -- Andre Scedrov -- Gender Bias in Neural Natural Language Processing.

This Festschrift is in honor of Prof. Andre Scedrov at the University of Pennsylvania. Scedrov has laid the foundations for a number of now well-established domains in mathematics and computer science including Proof Theory, Logic in Computer Science, Foundations in Computer Security, and Linguistics. This combination of breadth and penetrating originality is rare and impressive. This Festschrift only tries to reflect this combination with a number of contributions distributed among these different topics. It contains 11 technical articles and 3 short papers organized among sections on Logic, Logic and Computing, Logic and Security, and Logic and Language. Those articles are authored by researchers around the world, including North America, Russia, Europe, and Japan, that have been directly or indirectly impacted by Andre Scedrov. The chapter "A Small Remark on Hilbert's Finitist View of Divisibility and Kanovich-Okada-Scedrov's Logical Analysis of Real-Time Systems" is available open access under a CC BY 4.0 license at link.springer.com.