👉 A ringman is a mathematical concept used in algebra and group theory. A ringman is a function that is both injective (one-to-one) and surjective (onto), meaning it maps exactly one element of its domain to each element of its codomain. The term "ringman" comes from the fact that a ringman can be seen as an extension of a ring structure, which is often used in algebraic geometry. In this context, a ringman is a function that is
