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In logic and philosophy, a class refers to a collection or grouping of objects, entities, or individuals that share common characteristics or properties. Classes are fundamental concepts in set theory and predicate logic, providing a framework for organizing and categorizing entities based on their attributes.
Classes can be defined by specifying a set of criteria or properties that members of the class must satisfy. For example, the class of "mammals" includes all animals that share the common characteristic of giving birth to live young and nursing them with milk. Similarly, the class of "prime numbers" includes all integers greater than 1 that have no positive divisors other than 1 and themselves.
Classes can also be hierarchical, with broader classes encompassing narrower subclasses. For instance, the class of "animals" is a broader category that includes subclasses such as "mammals," "birds," "reptiles," and so on.
Understanding classes and their relationships is essential in various fields, including mathematics, logic, philosophy, and computer science. Classes provide a systematic way of organizing information, facilitating analysis, categorization, and inference.