Both Newton and Leibnitz adopted quite independent lines of approach which
was radically different However, respective theories accomplished results that
were practically identical Leibnitz used the notion of definite integral and what is
quite certain is that he first clearly appreciated tie up between the antiderivative
and the definite integral Conclusively, the fundamental concepts and theory of Integral Calculus
and primarily its relationships with Differential Calculus were developed in the
work of P