The quadrivium was the medieval name of the required course of study of the Pythagoreans, which had been adopted by the educational establishments in Europe.
- Arithmetic: study of the absolute discrete
- Music: study of the relative discrete
- Geometry: study of the stable continuous
- Astronomy: study of the moving continuous.
The word quadrivium is a Latin word meaning the four ways, or place where four roads meet (that is, literally: crossroads).