Nothing takes place in the world whose meaning is not that of some maximum or minimum
( Leonhard Euler, 1707-1783).
The calculus was the first achievement of modern mathematics and it is difficult to overestimate its importance
(John von Neumann, 1903-1957).
As you will find in multivariable calculus, there is often a number of solutions for any given problem
(John Forbes Nash, 1707-1783).
In my free time I do differential and integral calculus.
(Karl Marx, 1818-1883).
I will never listen to ocean waves or view a beautiful sunset in quite the same way again. That is perhaps the greatest gift one can gain by delving into calculus: It is a whole new way of looking at the world, accessible only through the realm of mathematics.
(Jennifer Ouellette, 1964).
Calculus is the outcome of a dramatic intellectual struggle which has lasted for twenty-five hundred years
(Richard Courant, 1888-1972).
But just as much as it is easy to find the differential [derivative] of a given quantity, so it is difficult to find the integral of a given differential. Moreover, sometimes we cannot say with certainty whether the integral of a given quantity can be found or not
(Johann Bernoulli, 1667-1748).
Among all of the mathematical disciplines the theory of differential equations is the most important… It furnishes the explanation of all those elementary manifestations of nature which involve time.
(Sophus Lie, 1842-1899).
Who has not been amazed to learn that the function y = e^x, like a phoenix rising from its own ashes, is its own derivative?
(Francois le Lionnais, 1901-1984).
[All phenomena] are equally susceptible of being calculated, and all that is necessary, to reduce the whole of nature to laws similar to those which Newton discovered with the aid of the calculus, is to have a sufficient number of observations and a
mathematics that is complex enough
(Nicolas de Condorcet, 1743-1794).
Science is the Differential Calculus of the mind. Art the Integral Calculus; they may be beautiful when apart, but are greatest only when combined.
(Ronald Ross, 1857-1932).