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.
The definition of systematic is something done according to a specific system, plan or method. An example of something that would be described as systematic is when weeds in a garden are all destroyed based on a carefully crafted weed-killing plan. YourDictionary definition and usage example.