👉 Twofoldness is a concept in mathematics and philosophy that refers to the existence of two or more things that are fundamentally different from one another. It has been used to describe the idea that there exists at least two distinct entities, each with their own unique properties and characteristics. The term was introduced by philosopher David Hume in his book "A Treatise on Metaphysics" (1735). In this work, Hume argued that it is impossible for a single thing or entity
