By definition, "Calculus is the mathematical study of change, in the same way that geometry is the study of shape and algebra is the study of operations and their application to solving equations". But apart from definitions... How come Calculus appeared in our knowledge? Who created it? Who noticed Calculus should be a new branch in this area? To explain these and more questions, we have to return to our past, reminisce those times we did not live in and try to find the logical aspects of calculus, to make it "understandable" for us. This reasoning can be explained with more than one example... For instance, how can we defend a country without knowing its past? or how can we try to solve a problem just by applying "rules and the theory" if we do not even know what are we doing? Therefore, let´s review Calculus and its past.
It can be said that Calculus was mainly created by Isaac Newton and Gottfried Wilhelm von Leibniz. Both of them developed new systems independently, where Newton considered variables changing with time and Leibniz thought of the variables x and y as ranging over sequences of infinitely close values.
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| Isaac Newton |
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| Gottfried Wilhelm von Leibniz |
During the development of Calculus over the years, not everyone was agree with either Newton or Leibniz´s models; for example, Lord Bishop Berkeley made serious criticisms of the calculus referring to infinitesimals as "the ghosts of departed quantities". This made the community of mathematicians react, and thanks to these "criticisms", new names with new ideas for the development of the area appeared: Cauchy, Weierstrass, and Riemann reformulated Calculus in terms of limits rather than infinitesimals.
Thanks to all these names, we know Calculus as it is in our days, one of the most useful tools we can use.