Arlington County has an extensive network of bicycle infrastructure, including 50 miles of shared-use off-street trails. These multi-use trails are generally 10 feet wide with a solid yellow line striped down the middle to separate users.
Constructive mathematics. Idea. Broadly speaking, constructive mathematics is mathematics done without the principle of excluded middle (or other principles, such as the full axiom of choice, that imply it).
Function remains more or less fixed whereas the purpose (which indicates intention or objective) generally changes. For example, the function of a hammer is to strike something nearby whereas its purpose (what to strike and why) could be anything the hammer-wielder has in mind. 2. Mathematics: A mathematical relationship in which a quantity (dependent variable) depends on or is determined by another quantity (independent variable) or quantities.