Works
In 1277 - encouraged by his pupils - he published Sefer Mitzvot Ḳaṭan (ספר מצוות קטן - "Small book of commandments"; generally called "Semaḳ" from the initials סמ"ק), an abridgment of Moses ben Jacob of Coucy's Sefer Mitzvot Gadol (called "Semag" from its initials סמ"ג). The work is officially under the title Ammude ha-Golah. It is divided into 7 "pillars" and includes (contemporary) Halacha along with Aggadic stories and Ethics. Although based on the Sefer Mitzvot Gadol the work does not delve into the argument behind the legal decision. "Semaḳ" was "most favorably received" by the Ashkenazi communities (France and Germany), and has often been edited and annotated.
Isaac also published Liḳḳuṭim (collectanea), and several small compilations containing his ritual decisions.
The Kol Bo (No. 128) contains a long fragment of a Talmudic work of R. Isaac, with this superscription: קצת דינים מה"ר יצחק ז"ל.
Read more about this topic: Isaac Ben Joseph Of Corbeil