Existence
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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,
One of the topics covered by theories of the nature of existence concerns the ontological status of fictional objects like Pegasus.
Bertrand Russell proposed his theory of descriptions to dissolve paradoxes surrounding negative existential statements.
According to Alexius Meinong, there are some entities that do not exist.
Plato and his student Aristotle disagreed on whether form and matter depend on one another for their existence.
Reality
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Reality is the totality of existence or what all existing entities have in common. It is often contrasted with appearance, opposing what is with what seems to be, although the accuracy and fundamental
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…
Aristotle proposed a system of ten categories to describe the fundamental constituents of reality.
According to René Descartes's substance dualism, reality is made up of two kinds of entities: matter and mind.