In her article, Nadia Vidro quotes an unknown passage from the Karaite halakhic treatise of Jacob al-Qirqasānī (d. 927) that is missing in Nemoy edition. The section deals with methods calculating Hebrew calendar used by various Jewish sects throughout history. According to author, this related R. Saʿadya Gaon’s “Book Distinction” (Kitāb al-tamyīz) and includes entire passages his commentary on...

Since graph theory was considered to have begun some 275 years ago, it has evolved into a subject with a fascinating history, a host of interesting problems and numerous diverse applications. While graph theory has developed ever-increasing connections with other areas of mathematics and a variety of scholarly fields, it is its beauty that has attracted so many to it. As with the previous editi...