Under Â§ 1505, however, a defendant can be convicted of obstruction of justice by obstructing a pending proceeding before Congress or a federal agency. A pending proceeding could include an informal investigation by an executive agency.
Piecewise is actually a way of expressing the function, rather than a characteristic of the function itself, but with additional qualification, it can describe the nature of the function.
A piecewise function is a function that is defined on a sequence of intervals. A common example is the absolute value, (1) Piecewise functions are implemented in the Wolfram Language as Piecewise[val1, cond1, val2, cond2, ...]. Additional piecewise functions include the Heaviside step function, rectangle function, and triangle function.