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 WAVES & DESTRUCTIVE WAVES. CONSTRUCTIVE WAVES. Constructive waves are low energy waves that deposit materials on a coast. As the waves approach such as coast, the friction between the waves and the sea bed causes the waves to slow down at some distance from the coast. The waves break gently over a long distance.