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Compilation Known to compile with Coq trunk 13689. Warning: This development assumes a case sensitive file system.Directory structure: src/interfaces/ Definitions of abstract interfaces/structures. src/implementations/ Definitions of concrete data structures and algorithms, and proofs that they are instances of certain structures (i.e. implement certain interfaces). src/orders/ Definitions and theory about orders on different structures. src/categories/ Proofs that certain structures form categories. src/varieties/ Proofs that certain structures are varieties, and translation to/from type classes dedicated to these structures (defined in interfaces/). src/theory/ Proofs of properties of structures. src/misc/ Miscellaneous things. src/broken/ Things that currently do not compile. src/quote/ Prototype implementation of type class based quoting. To be integrated. tools/ Scripts and utilities.The reason we treat categories and varieties differently from other structures(like groups and rings) is that they are like meta-interfaces whose implementationsare not concrete data structures and algorithms but are themselves abstract structures.To be able to distinguish the various arrows, we recommend using a variable width font.