A robot arm is constructed in R3 by anchoring a rod of length 2 to the origin (using a
Chapter 8, Problem 4(choose chapter or problem)
A robot arm is constructed in R3 by anchoring a rod of length 2 to the origin (using a ball joint so that the rod may swivel freely) and attaching to the free end of the rod another rod of length 1 (which may also swivel freely; see Figure 8.8). Show that the set of states of this robot arm may be described by a smooth parametrized 4-manifold in R6.
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