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).
Constructive Interference. Interference is a process of the formation of new wave with lower or higher amplitude by superimposition of two waves. It is the interaction process of two waves which are produced from either same source or same frequency. This effect is seen for all types of waves.