Existence is the state of having being or reality in contrast to nonexistence and nonbeing. Existence is often contrasted with essence: the essence of an entity is its essential features or qualities, which can be understood even if … 展开

Closely related to the problem of different types of entities is the question of whether their modes of existence also vary. This is the case according to … 展开

Theories of the nature of existence aim to explain what it means for something to exist. A central dispute in the academic discourse about the nature of existence is whether existence is a property of individuals. An individual is a unique entity, like Socrates 展开

Dictionaries define existence as the state of being real and to exist as having being or participating in reality. Existence sets real entities apart from imaginary ones, and can refer both to … 展开

Many discussions of the types of existing entities revolve around the definitions of different types, the existence or nonexistence of entities of a specific type, the ways entities of different types are related to each other, and whether some types are more … 展开

Western philosophy
Western philosophy originated with the Presocratic philosophers, who aimed to replace earlier mythological accounts of the universe by providing … 展开

Formal logic
Formal logic studies deductively valid arguments. In first-order logic, which is the most-commonly used system of formal logic, existence is … 展开