Main themes of the treatise include distinguishing a whole family of senses of “one” (in a few cases Fârâbî also gives the corresponding senses of the abstract “unity”), but also and especially distinguishing different ways that senses of “one” are related to senses of “many”. The treatise can read like a dry catalogue, and Fârâbî rarely gives arguments or admits that his claims might be controversial, but it is often clear that he has an opponent in mind. That opponent might be a type rather th