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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.
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]
Truth-bearers are entities that can be true or false, such as linguistic statements and mental representations. A truthmaker of a statement is the entity whose existence makes the statement true. [93] For example, the fact that a tomato exists and that it is red acts as a truthmaker for the statement "a tomato is red". [94]
Faint young Sun paradox: The contradiction between existence of liquid water early in the Earth's history and the expectation that the output of the young Sun would have been insufficient to melt ice on Earth. Olbers' paradox: Why is the night sky dark if there is an infinity of stars, covering every part of the celestial sphere?
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.
In Buddhism, the three marks of existence are three characteristics (Pali: tilakkhaṇa; Sanskrit: त्रिलक्षण trilakṣaṇa) of all existence and beings, namely anicca (impermanence), dukkha (commonly translated as "suffering" or "cause of suffering", "unsatisfactory", "unease"), [note 1] and anattā (without a lasting essence).
For example, "true" presents an aspect of existence, as any existent thing will be "true" insofar as it is true that it exists. Or "one," insofar as any existent thing will be (at least) "one thing." [ 22 ] The premise which seems to cause the most difficulty among interpreters of the fourth way is that the greatest in a genus is the cause of ...
Descartes argues that God's existence can be deduced from his nature, just as geometric ideas can be deduced from the nature of shapes—he used the deduction of the sizes of angles in a triangle as an example. He suggested that the concept of God is that of a supremely perfect being, holding all perfections.