For example, what is thought to be the introductory section of Parmenides' poem on the Ways of Truth and Opinion was quoted by Sextus Empiricus and Simplicius; in Diels-Kranz this is labeled as fragment 28B1 — i.e., chapter 28, section B, fragment 1.
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In Berlin and Marburg, he took courses in philosophy, psychology, and pedagogics under Hermann Cohen, Paul Natorp, Ernst Cassirer, Hermann Alexander Diels, and Heinrich Wölfflin.