Metaphysics
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Metaphysics is the branch of philosophy that examines the basic structure of reality. It is often characterized as first philosophy, implying that it is more fundamental than other forms of philosophical inquiry. Metaphysics is traditionally seen as the study of mind-independent features of the world, but some modern theorists understand it as an inquiry into the conceptual schemes that underlie human thought and experience.
The beginning of Aristotle's Metaphysics, one of the foundational texts of the discipline
Immanuel Kant conceived critical metaphysics as the study of the principles underlying all human thought and experience.
David Hume criticized metaphysicians for trying to arrive at knowledge outside the field of sensory experience.
Boethius's theory of universals influenced many subsequent metaphysicians.
Philosophy
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Philosophy is a systematic study of general and fundamental questions concerning topics like existence, reason, knowledge, value, mind, and language. It is a rational and critical inquiry that reflects on its own methods and assumptions.
The statue The Thinker by Auguste Rodin is a symbol of philosophical thought.
Physics was originally part of philosophy, like Isaac Newton's observation of how gravity affects falling apples.
Aristotle was a major figure in ancient philosophy and developed a comprehensive system of thought including metaphysics, logic, ethics, politics, and natural science.
Portrait of Avicenna on a silver vase. He was one of the most influential philosophers of the Islamic Golden Age.