Changes

===Infinitesimal===

===Infinitesimal===

Inherent in the concept of infinity is the concept of infinitesimal:  infinity small. [[Archimedes]] used small numbers and areas, as in calculating the area under a parabola, but the [[Ancient Greeks]] rejected the concept of infinity.  Beginning with the 17th century, mathematicians like [[Fermat]], [[Euler]], [[Newton]], and [[Leibniz]] used the concept of infinitesimal in integrals and differentials. [[Bernhard Riemann]] used the concept of infinitesimal to develop a rigorous definition of the integral, now known as the [[Riemann Integral]].

Inherent in the concept of infinity is the concept of infinitesimal:  infinity small. [[Archimedes]] used small numbers and areas, as in calculating the area under a parabola, but the [[Ancient Greeks]] rejected the concept of infinity.  Beginning with the 17th century, mathematicians like [[Fermat]], [[Euler]], [[Newton]], and [[Leibniz]] used the concept of infinitesimal in integrals and differentials. [[Bernhard Riemann]] used the concept of limits to develop a rigorous definition of the integral, now known as the [[Riemann Integral]].

=== Infinity and economics ===

=== Infinity and economics ===