Diagrammatic Representation and Inference - 12th International Conference, Diagrams 2021, Virtual, September 28–30, 2021, Proceedings

This book constitutes the refereed proceedings of the 12th International Conference on the Theory and Application of Diagrams, Diagrams 2021, held virtually in September 2021. The 16 full papers and 25 short papers presented together with 16 posters were carefully reviewed and selected from 94 submissions.