In the last 60 years, the use of the notion of category has led to a remarkable unification and simplification of mathematics.
The treatment does not presuppose knowledge of specific fields, but rather develops, from basic definitions, such elementary Categories as discrete.
Conceptual Mathematics, Second Edition, introduces the concept of \'category\' for the learning, development, and use of mathematics, to both beginning students and general readers, and to practicing mathematical scientists.
In the last 60 years, the use of the notion of category has led to a remarkable unification and simplification of mathematics