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This book constitutes the refereed proceedings of the 12th International Conference on Intelligent Computer Mathematics, CICM 2019, held in Prague, Czech Republic, in July 2019. The 19 full papers presented were carefully reviewed and selected from a total of 41 submissions. The papers focus on digital and computational solutions which are becoming the prevalent means for the generation, communication, processing, storage and curation of mathematical information. Separate communities have developed to investigate and build computer based systems for computer algebra, automated deduction, and mathematical publishing as well as novel user interfaces. While all of these systems excel in their own right, their integration can lead to synergies offering significant added value.

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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.

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