Algebraic combinatorics# Thematic tutorials# Algebraic Combinatorics in Sage Lie Methods and Related Combinatorics in Sage Linear Programming (Mixed Integer) Enumerated sets of combinatorial objects# Enumerated sets of partitions, tableaux, … GelfandTsetlinPattern, GelfandTsetlinPatterns KnutsonTaoPuzzleSolver Groups and Algebras# Catalog of algebras Groups SymmetricGroup, CoxeterGroup, WeylGroup PartitionAlgebra IwahoriHeckeAlgebra SymmetricGroupAlgebra NilCoxeterAlgebra AffineNilTemperleyLiebTypeA Descent Algebras Diagram and Partition Algebras Blob Algebras Combinatorial Representation Theory# Root Systems Crystals Rigged configurations Cluster algebras and quivers KazhdanLusztigPolynomial SymmetricGroupRepresentation Yang-Baxter Graphs Hall Polynomials Operads and their algebras# Free Dendriform Algebras Free Pre-Lie Algebras Free Zinbiel Algebras