Define a function with one variable,
:
This method works for any order; just add more primes:
Or use
D. Its first argument is the function and its second argument is the variable:
For higher-order derivatives using
D, the second argument is a list,
{variable, order}:
Define a function with two variables,
:
Take the first derivative with respect to
and the second with respect to
by combining the two forms (single variable and list):
The Heaviside theta function is treated as if it had an infinite pulse at zero, where it is undefined:
The
HeavisideTheta function has special derivative properties:
