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  2. 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.

  3. Existentialism - Wikipedia

    en.wikipedia.org/wiki/Existentialism

    Existentialism is a family of philosophical views and inquiry that study existence from the individual's perspective and explore the human struggle to lead an authentic life despite the apparent absurdity or incomprehensibility of the universe.

  4. Ontology - Wikipedia

    en.wikipedia.org/wiki/Ontology

    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]

  5. Time - Wikipedia

    en.wikipedia.org/wiki/Time

    Time is the continuous progression of existence that occurs in an apparently irreversible succession from the past, through the present, and into the future. [1] [2] [3] It is a component quantity of various measurements used to sequence events, to compare the duration of events (or the intervals between them), and to quantify rates of change of quantities in material reality or in the ...

  6. Pre-existence - Wikipedia

    en.wikipedia.org/wiki/Pre-existence

    Pre-existence, premortal existence, beforelife, or life before birth, is the belief that each individual human soul existed before mortal conception, and at some point before birth enters or is placed into the body. Concepts of pre-existence can encompass either the belief that the soul came into existence at some time prior to conception or ...

  7. Meaning of life - Wikipedia

    en.wikipedia.org/wiki/Meaning_of_life

    The first English use of the expression "meaning of life" appears in Thomas Carlyle's Sartor Resartus (1833–1834), book II chapter IX, "The Everlasting Yea". [1]Our Life is compassed round with Necessity; yet is the meaning of Life itself no other than Freedom, than Voluntary Force: thus have we a warfare; in the beginning, especially, a hard-fought battle.

  8. History of Earth - Wikipedia

    en.wikipedia.org/wiki/History_of_Earth

    The continents of Ur, Vaalbara and Kenorland may have existed around this time. The atmosphere is composed of volcanic and greenhouse gases. Proterozoic: 2,500–538.8 The name of this eon means "early life". Eukaryotes, a more complex form of life, emerge, including some forms of multicellular organisms.

  9. 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.