An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

The simplest mathematical → differentiation of one quantity relative to another; df(x)/dx. It is the same as → derivative, contrasted with the → second derivative or the nth derivative.

→ first; → derivative.

In → calculus, a method for determining whether an → inflection point is a → local minimum, → local maximum, or neither.

→ first; → derivative; → test.