In the last 60 years, the use of the notion of category has led to a remarkable unification and simplification of mathematics. Conceptual Mathematics ... the fundamental ideas are then illuminated by ...

For example, the union of set \(A\) and set \(B\) is written as \(A\)ᴜ\(B\). The union of set \(X\), set \(Y\) and set \(Z\) is written as \(X\)ᴜ\(Y\)ᴜ\(Z ...