Clavis Rerum is a philosophical inquiry into the nature of reality, knowledge, and truth. Written by William C. Robinson, a philosopher and scholar of the early 20th century, this book draws on a wide range of intellectual traditions, from ancient Greek philosophy to contemporary science, to explore the ultimate questions of human existence and understanding. With its rigorous argumentation and thought-provoking insights, Clavis Rerum remains a challenging and rewarding read for students and scholars of philosophy.

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