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  2. Ontology - Wikipedia

    en.wikipedia.org/wiki/Ontology

    Being, or existence, is the main topic of ontology. It is one of the most general and fundamental concepts, encompassing all of reality and every entity within it. [b] In its broadest sense, being only contrasts with non-being or nothingness. [14] It is controversial whether a more substantial analysis of the concept or meaning of being is ...

  3. Reality - Wikipedia

    en.wikipedia.org/wiki/Reality

    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.

  4. Metaphysics - Wikipedia

    en.wikipedia.org/wiki/Metaphysics

    Metaphysicians often regard existence or being as one of the most basic and general concepts. [26] To exist means to be part of reality, distinguishing real entities from imaginary ones. [27] According to a traditionally influential view, existence is a property of properties: if an entity exists then its properties are instantiated. [28]

  5. Solipsism - Wikipedia

    en.wikipedia.org/wiki/Solipsism

    Solipsism (/ ˈ s ɒ l ɪ p s ɪ z əm / ⓘ SOLL-ip-siz-əm; from Latin solus 'alone' and ipse 'self') [1] is the philosophical idea that only one's mind is sure to exist. As an epistemological position, solipsism holds that knowledge of anything outside one's own mind is unsure; the external world and other minds cannot be known and might not exist outside the mind.

  6. Existentialism - Wikipedia

    en.wikipedia.org/wiki/Existentialism

    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 ...

  7. Existence - Wikipedia

    en.wikipedia.org/wiki/Existence

    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.

  8. Philosophy - Wikipedia

    en.wikipedia.org/wiki/Philosophy

    Philosophy is a systematic study of general and fundamental questions concerning topics like existence, reason, knowledge, value, mind, and language. It is a rational and critical inquiry that reflects on its methods and assumptions. Historically, many of the individual sciences, such as physics and psychology, formed part of philosophy ...

  9. Panpsychism - Wikipedia

    en.wikipedia.org/wiki/Panpsychism

    In the philosophy of mind, panpsychism (/ p æ n ˈ s aɪ k ɪ z əm /) is the view that the mind or a mind-like aspect is a fundamental and ubiquitous feature of reality. [1] It is also described as a theory that "the mind is a fundamental feature of the world which exists throughout the universe". [ 2 ]