Original sentence: Both of the Enchiriadis treatises are primarily works on the concept of a mathematical derivation of the gamut and the modes from theories of conjunct and disjunct tetrachords (series of four pitches involving fixed tone and semitone relationships within them)
Edited sentence: Both of the Enchiriadis treatises are primarily works on the concept of a pseudo-scientific derivation of the gamut and the modes from theories of conjunct and disjunct tetrachords (series of four pitches involving fixed tone and semitone relationships within them)