Formalized Metatheory with Terms Represented by an Indexed Family of Types.- A Content Based Mathematical Search Engine: Whelp.- A Machine-Checked Formalization of the Random Oracle Model.- Extracting a Normalization Algorithm in Isabelle/HOL.- A Structured Approach to Proving Compiler Optimizations Based on Dataflow Analysis.- Formalising Bitonic Sort in Type Theory.- A Semi-reflexive Tactic for (Sub-)Equational Reasoning.- A Uniform and Certified Approach for Two Static Analyses.- Solving Two Problems in General Topology Via Types.- A Tool for Automated Theorem Proving in Agda.- Surreal Numbers in Coq.- A Few Constructions on Constructors.- Tactic-Based Optimized Compilation of Functional Programs.- Interfaces as Games, Programs as Strategies.- ?Z: Zermelo’s Set Theory as a PTS with 4 Sorts.- Exploring the Regular Tree Types.- On Constructive Existence.