• f is any scalar-valued function. When calculating the definite integral f must be defined in the closed interval [a, b]. The function can be complex, except in the case of infinite limit integration. It can be a function of any number of variables.

• x is the variable of integration.

• a, b are real scalars. They must have units compatible with x.

• You can create multiple integrals by inserting the integral operator multiple times.

• Sharply peaked integrands, discontinuous integrands, or integrands whose shape is not readily characterized by a single length scale may not evaluate accurately. You can integrate such functions by parts.

• This operator may also be evaluated symbolically for integrals with a closed-form solution.