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.