Interactive Theorem Proving/ HOL.- Competing inheritance paths in dependent type theory: a case study in functional analysis.- A Lean tactic for normalising ring expressions with exponents (short paper).- Practical proof search for Coq by type inhabitation.- Quotients of Bounded Natural Functors.- Trakhtenbrot’s Theorem in Coq.- Deep Generation of Coq Lemma Names Using Elaborated Terms.- Extensible Extraction of Efficient Imperative Programs with Foreign Functions, Manually Managed Memory, and Proofs.- Validating Mathematical Structures.- Teaching Automated Theorem Proving by Example: PyRes 1.2 (system description).- Beyond Notations: Hygienic Macro Expansion for Theorem Proving Languages.- Formalizations.- Formalizing the Face Lattice of Polyhedra.- Algebraically Closed Fields in Isabelle/HOL.- Formalization of Forcing in Isabelle/ZF.- Reasoning about Algebraic Structures with Implicit Carriers in Isabelle/HOL.- Formal Proof of the Group Law for Edwards Elliptic Curves.- Verifying Farad_zev-Read type Isomorph-Free Exhaustive Generation.- Verification.- Verified Approximation Algorithms.- Efficient Verified Implementation of Introsort and Pdqsort.- A Fast Verified Liveness Analysis in SSA form.- Verification of Closest Pair of Points Algorithms.- Reasoning Systems and Tools.- A Polymorphic Vampire (short paper).- N-PAT: A Nested Model-Checker (system description).- HYPNO: Theorem Proving with Hypersequent Calculi for Non-Normal Modal Logics (system description).- Implementing superposition in iProver (system description).- Moin: A Nested Sequent Theorem Prover for Intuitionistic Modal Logics (system description).- Make E Smart Again.- Automatically Proving and Disproving Feasibility Conditions.- µ-term: Verify Termination Properties Automatically (system description).- ENIGMA Anonymous: Symbol-Independent Inference Guiding Machine (system description).- The Imandra Automated Reasoning System (system description).- A Programmer’s Text Editor for a Logical Theory: The SUMOjEdit Editor (system description).- Sequoia: a playground for logicians (system description).- Prolog Technology Reinforcement Learning Prover (system description).