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These are the anonymous Greek scholia on the Elements of Euclid, the Alexandrian mathematician of about 300 BC, gathered from the manuscripts of the Elements. They comment on the books of the Elements in turn, beginning with the division of geometry into plane and solid, and explain definitions, postulates and proofs, supply alternative demonstrations and discuss the history of the subject. Some of the notes on the first book draw on Proclus' commentary.
The Elements was the foundation of mathematical education for two thousand years, and these scholia record how it was taught. They also preserve notable historical claims, such as the attribution of the theory of proportion in the fifth book to Eudoxus and the association of the regular solids with the Pythagoreans and Theaetetus. They are a key source for the history of Greek mathematics.
About this edition. The Greek text comes from the Eulogikon open corpus of public-domain editions (standard reference: Heiberg, Euclidis Elementa V (Teubner 1888)). Every word has been analyzed with odyCy, a neural language model for Ancient Greek — click or tap any word for its dictionary form, part of speech, and complete morphology, together with the full entry from the Liddell–Scott–Jones Greek–English Lexicon (LSJ).