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Định nghĩa
Phác thảo, tiểu phẩm.
Ví dụ :
Bút ký trào phúng, biếm họa chính trị.
Ví dụ :
Bản phác thảo toán học.
A formal specification of a mathematical structure or a data type described in terms of a graph and diagrams (and cones (and cocones)) on it. It can be implemented by means of “models”, which are functors which are graph homomorphisms from the formal specification to categories such that the diagrams become commutative, the cones become limiting (i.e., products), the cocones become colimiting (i.e., sums).