Why is Brahmagupta considered a great mathematician?

Brahmagupta was a great 7^th century(AD 597-668) Indian mathematician and astronomer hailing from the state of Rajastan. Brahmagupta become the head of the astonomical observatory at Ujjain.

Brahmagupta

            In his work on arithematic, Brahmagupta explained how to find the cube and cube-root of an integer, and gave rules facilitating the computation of squares and square roots. He also gave rules for dealing with five types of combinations of fractions.

            Brahmagupta’s genius,  however, came in his treatment of the concept of zero. Although the number zero is often also attributed to the 7^th century Indian mathematician Bhaskara I, Brahagupta’s ‘Brahhma Sphuta Siddhanta’ is probably the earliest known text to treat zero as a number in its own rigth, rather than as simply a placehoder digit as was done till then.

            Brahmagupta also dedicated a substantial portion of his work to geometry and trigonomery.