Halayudha

Halāyudha wrote the Mṛtasañjīvanī, a commentary on Pingala's Chandaḥśāstra, was an Indian mathematician and poet who lived and worked in the 10th century. The Chandaḥśāstra by the Indian lyricist Piṅgala somewhat cryptically describes a method of arranging two types of syllables to form metres of various lengths and counting them; as interpreted and elaborated by Halāyudha his "method of pyramidal expansion" (meru-prastāra) for counting metres is equivalent to Pascal's triangle.