Since then, various areas of investigation.
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That were traditionally part of philosophy have become separate academic disciplines, such as psychology,
sociology, linguistics, and economics.
In Against the Logicians the Pyrrhonist philosopher.
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Sextus Empiricus detailed the variety of ways in which the ancient Greek philosophers had divided philosophy,
noting that this three-part division was agreed to by Plato, Aristotle, Xenocrates, and the Stoics.
A major point of debate is between realism.
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Which holds that there are entities that exist independently of their mental perception and idealism, which
holds that reality is mentally constructed or otherwise immaterial. Metaphysics deals with the topic of
identity.