👉 In the context of mathematics, an "oppidan" is a mathematical operation or function that produces another function. It can be defined as any function that returns a new function based on some input data and possibly additional inputs. For example: - The unary minus (op) is an oppidan that returns the negative of its argument. - The binary operator (op) is an oppidan that performs addition, multiplication, or division on two operands. - The ternary operator (op) is an