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The manuscript Summa Logicae (William of Ockham)

The Summa Logicae (Latin, in English it's the Sum of Logic) is a textbook on logic by William of Ockham (1323). There are articles about the Summa Logicae in Wikipedia and in Logicmuseum. It was ...
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What does this symbol in the title page illustration of the “Margarita Philosophica” mean?

The Margarita Philosophica appeared around the year 1500 CE, written by Gregor Reisch of Freiburg. The title page of the manuscript contains the fascinating image below, in which the seven primary ...