This library is built in the open.
If you spot an error, have a suggestion, or just want to say hello — we’d love to hear from you.

original Greek: Theologoumena. This term refers to the study of the divine or mystical nature of things. In this context, it describes the "theology" of numbers—how each number relates to the divine, the gods, and the structure of the cosmos according to Neopythagoreanism (a philosophical movement that saw numbers as the fundamental principles of reality).
original Greek: Arithmetikes. To the ancient Greeks, "Arithmetic" did not mean simple calculation (which they called logistike), but rather the theoretical and philosophical study of the properties and relationships of numbers.
A large vertical shadow or dark artifact is present along the left gutter (the inner spine area) of the original page, likely caused during the scanning or digitization process.