"A Treatise on Probability" by John Maynard Keynes is a philosophical work published in 1921. It presents a groundbreaking logical approach to uncertainty, moving beyond traditional numerical probability theories. Keynes argues that probability is a logical relationship between evidence and hypothesis—one that isn't always quantifiable or comparable. Through examining fundamental concepts, measurement challenges, and the weight of evidence, he develops a framework that influenced later thinkers and remains relevant to modern artificial intelligence and behavioral economics debates. (This is an automatically generated summary.)