Interaction with Formal Mathematical Documents in Isabelle/PIDE.- Beginners’ quest to formalize mathematics: A feasibility study in Isabelle 16.- Towards a Unified Mathematical Data Infrastructure: Database and Interface Generation.- A Tale of Two Set Theories.- Relational Data Across Mathematical Libraries.- Variadic Equational Matching.- Comparing machine learning models to choose the variable ordering for cylindrical algebraic decomposition.- Towards Specifying Symbolic Computation.- Lemma Discovery for Induction - A survey.- Experiments on automatic inclusion of some non-degeneracy conditions among the hypotheses in locus equation computations.- Formalization of Dubé’s Degree Bounds for Gröbner Bases in Isabelle/HOL 155.- Le Coq Library as a Theory Graph.- BNF-Style Notation as it is Actually Used.- MMTTeX: Connecting Content and Narration-Oriented Document Formats.- Diagram Combinators in MMT.- Inspection and selection of representations.- A plugin to export Coq libraries to XML.- Forms of Plagiarism in Digital Mathematical Libraries.- Integrating Semantic Mathematical Documents and Dynamic Notebooks.- Explorations into the Use of Word Embedding in Math Search and Math Semantics.