History of Hindu Mathematics: A Source Book v2.c17.s6.1

v2.c17.s6.1

**Rule of Concurrence.** One topic commonly discussed by almost all Hindu writers goes by the special name of *saṅkramaṇa* (concurrence). According to Nârâyaṇa (1350), it is also called *saṅkrama* and *saṅkrâma*.² Brahmagupta (628) includes it in algebra while others consider it as falling within the scope of arithmetic. As explained by the commentator Gaṅgâdhara (1420), the subject of discussion here is "the investigation of two quantities concurrent or grown together in the form of their sum and difference."