Last updated on 22 Jun 2018
Isaac Newton was born on the 25th of December (under the old Calendar; in our calendar he was born on 4 January, but ignore that for this post). In a wonderful marriage of good scholarship and computers (often a very bad arrangement), Cambridge University Library’s Digital Library project has digitised some of Isaac’s notebooks and manuscripts. This one is his Trinity College Notebook, which he wrote as an undergraduate. Of interest to me, given that I am about to publish a chapter in a book (in Portuguese!) on the use of tree diagrams and thinking, is his version of the Arbor Porphyriana (Tree of Porphyry) used for generations to teach Aristotle’s logical division, or diaeresis:
Logical trees are a very old way of representing classifications of ideas by division; we would call them subsets today.