👉 Semidiness is a concept in mathematics that refers to a property of sets that can be expressed as a binary relation between two elements. In other words, it states that a set S has both a full and a partial identity element (namely, the empty set), but not a singleton.
For example, consider the set A = {1, 2, 3, 4} with its usual binary operation
on it. The semidiness of this set can be defined as
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What is the definition of Semidiness? 🙋
