The Corequisite Codex is not meant for a single course, nor is it meant to be read by the student in a linear fashion. Instead, it is a resource from which all corequisite courses within mathematics a...The Corequisite Codex is not meant for a single course, nor is it meant to be read by the student in a linear fashion. Instead, it is a resource from which all corequisite courses within mathematics at Cosumnes River College derive their material.