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Ontology is the study of being. It is the branch of philosophy that investigates the nature of existence, the features all entities have in common, and how they are divided into basic categories of being. [1] It aims to discover the foundational building blocks of the world and characterize reality as a whole in its most general aspects.
Metaphysics is the study of the most general features of reality, including existence, objects and their properties, possibility and necessity, space and time, change, causation, and the relation between matter and mind. It is one of the oldest branches of philosophy. [1] [a]
Philosophy addresses two different aspects of the topic of reality: the nature of reality itself, and the relationship between the mind (as well as language and culture) and reality. On the one hand, ontology is the study of being, and the central topic of the field is couched, variously, in terms of being, existence, "what is", and reality.
The existential quantifier ∃ is often used in logic to express existence.. 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 one does not know whether the entity exists.
Herbert Marcuse criticized Being and Nothingness for projecting anxiety and meaninglessness onto the nature of existence itself: "Insofar as Existentialism is a philosophical doctrine, it remains an idealistic doctrine: it hypostatizes specific historical conditions of human existence into ontological and metaphysical characteristics ...
Sartre states that "Consciousness is a being such that in its being, its being is in question insofar as this being implies a being other than itself." Existence: Concrete, individual being-for-itself here and now. Existence precedes essence. The subjective existence of reality precedes and defines its nature.
Branch of philosophy – philosophy is the study of general and fundamental problems, such as those connected with existence, knowledge, values, reason, mind, and language. [4] [5] Philosophy is distinguished from other ways of addressing such problems by its critical, generally systematic approach and its reliance on rational argument. [6]
His existential phenomenology, which is articulated in his works such as Being and Nothingness (1943), is based on the distinction between being-in-itself and being-for-itself. [10] Beauvoir placed her discourse on existential phenomenology within her intertwining of literature and philosophy as a way to reflect concrete experience.