Hello all; I have been thinking about something for some time and could not find it through the internet so i decided to ask this to you. In theory of machines course, there is lambda (degree of freedom of space) in the degree of freedom of mechanism formula. As you already know, lambda should be constant throughout the mechanism in order to use the formula. Here is my question; How do you know that lambda is constant or not? I cannot figure that out and i would appreciate very much if you gave me some examples. Thank you all for your interest.