The use of infinitesimals in mathematics was frowned upon by followers of Karl Weierstrass .
The use of infinitesimals in mathematics was survived in science and engineering , and even in rigorous mathematics , via the fundamental computational device known as the differential .
The use of infinitesimals in mathematics was frowned upon by followers of Karl Weierstrass , but survived in science and engineering , and even in rigorous mathematics , via the fundamental computational device known as the differential .