Indian mathematics is a branch of mathematics that began in the Indian subcontinent and has greatly influenced mathematical thought throughout history. The study of Indian mathematics includes the development of concepts such as zero, irrational numbers, and decimal number system. Synonyms for Indian mathematics include Vedic mathematics, which is a system of mathematics that was discovered in ancient India and is based on 16 sutras and 13 sub-sutras. Another synonym is ancient Indian mathematics, which refers to the mathematical developments that took place in India before the 12th century. Indian astronomy, trigonometry, and geometry are also closely related to Indian mathematics. The history and evolution of Indian mathematics is a fascinating subject that continues to be explored by mathematicians and historians alike.