This book constitutes the refereed proceedings of the 12th International Conference on Formal Concept Analysis, ICFCA 2014, held in Cluj-Napoca, Romania, in June 2014. The 16 regular papers presented together with 3 invited talks were carefully reviewed and selected from 39 submissions. The papers in this volume cover a rich range of FCA aspects, such as theory, enhanced FCA. Knowledge discovery and knowledge spaces, as well as methods and applications. In addition the book contains a reprint of the first publication "Sub direct decomposition of concept lattices" by Rudolf Wille. Learning Spaces, and How to Build Them.- On the Succinctness of Closure Operator Representations.- MDL in Pattern Mining: A Brief Introduction to Krimp.- Upper Bound for the Number of Concepts of Contranominal-Scale Free Contexts.- Algebraicity and the Tensor Product of Concept Lattices.- On the Existence of Isotone Galois Connections between Preorders.- Directed Tree Decompositions.- A Proposition for Combining Pattern Structures and Relational Concept Analysis.- RCA as a Data Transforming Method: A Comparison with Propositionalisation.- Ordinal Factor Analysis of Graded Data.- On Knowledge Spaces and Item Testing.- Scalable Estimates of Concept Stability.- Factors and Skills.- Automatized Construction of Implicative Theory of Algebraic Identities of Size Up to 5.- Closed Patterns and Abstraction Beyond Lattices.- Mining Videos from the Web for Electronic Textbooks.- Automated Enzyme Classification by Formal Concept Analysis.- Multi layered, Blocked Formal Concept Analyses for Adaptive Image Compression.- Attribute Exploration with Proper Premises and Incomplete Knowledge Applied to the Free Radical Theory of Ageing.- Sub direct Decomposition of Concept Lattices.
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