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).
The scientific definition is defines work as a scalar. The definition of Work should recognize the Quaternion nature of Work, W = Wscalar + Wvector =[f,F] [d, D] = [fd -F.D, fD + Fd + FxD] . The definition of work is deceptively simple, but for accuracy it is perhaps better to approach this in stages. It is often stated too simply, i.e. Work equals force times distance.. It is necessary to clarify the vector nature in order to get the scientific definition.