However, the decline of differential calculus should not be exaggerated, because differential calculus has always been used in graduate training and in applications.
During her studies, she took every mathematics course offered, including spherical trigonometry, differential calculus, projective geometry, partial differential equations, and statistics.
The primary objects of study in differential calculus are the derivative of a function, related notions such as the differential, and their applications.
He is best known for his work on the theory of equations, algebraic analysis, plain and spherical trigonometry, analytical geometry, and differential calculus.