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Founded by Aristotle with a focus on empirical observation and categorization of knowledge.

Founded by Plato emphasizing ideal forms and the importance of the soul.

Founded by Zeno of Citium, this school taught the philosophy of Stoicism which promotes living in harmony with the logos (universal reason).

Founded by Epicurus, this school believed in seeking happiness through pleasure, friendship, and a simple life.

Founded by Antisthenes, followers believe in living a virtuous life in accordance with nature, rejecting all conventional desires for wealth, power, and fame.

Founded by Parmenides, this school is known for the doctrine of monism, stating that reality is unchangeable and uniform.

Founded by Aristotle after he left Plato's Academy, this school focuses on detailed empirical research and the consolidation of gathered knowledge.

Founded by Pythagoras, known for its belief in the transmigration of souls and that reality could be explained by numbers and mathematical proportions.

Founded by Euclid of Megara, this school is known for its logic and the idea that good is the same as existence.