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  2. Ontology - Wikipedia

    en.wikipedia.org/wiki/Ontology

    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.

  3. Being and Nothingness - Wikipedia

    en.wikipedia.org/wiki/Being_and_Nothingness

    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.

  4. Philosophical realism - Wikipedia

    en.wikipedia.org/wiki/Philosophical_realism

    Philosophical realism—usually not treated as a position of its own but as a stance towards other subject matters—is the view that a certain kind of thing (ranging widely from abstract objects like numbers to moral statements to the physical world itself) has mind-independent existence, i.e. that it exists even in the absence of any mind perceiving it or that its existence is not just a ...

  5. Dasein - Wikipedia

    en.wikipedia.org/wiki/Dasein

    In German, Dasein is the vernacular term for "existence". It is derived from da-sein, which literally means "being-there" or "there-being". [3] In a philosophical context, it was first used by Leibniz and Wolff in the 17th century, as well as by Kant and Hegel in the 18th and 19th; however, Heidegger's later association of the word with human existence was uncommon and not of special ...

  6. Existential phenomenology - Wikipedia

    en.wikipedia.org/wiki/Existential_phenomenology

    In Being and Time, Martin Heidegger reframes Edmund Husserl's phenomenological project into what he terms fundamental ontology.This is based on an observation and analysis of Dasein ("being-there"), human being, investigating the fundamental structure of the Lebenswelt (lifeworld, Husserl's term) underlying all so-called regional ontologies of the special sciences.

  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. 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.

  9. Theory of everything (philosophy) - Wikipedia

    en.wikipedia.org/wiki/Theory_of_everything...

    In philosophy, a theory of everything (ToE) is an ultimate, all-encompassing explanation or description of nature or reality. [ 1 ] [ 2 ] [ 3 ] Adopting the term from physics, where the search for a theory of everything is ongoing, philosophers have discussed the viability of the concept and analyzed its properties and implications.