Unfortunately, limitations of the browser used by Answers.com means that we cannot see most symbols. Assuming that you mean d~(e~f) = (d~e)~f where ~ is a binary operation, it is the associative property.
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The commutative property
If a, b, c and d are any four integers and b and d are non-zero so that a/b and c/d are fractions, then the commutative property states that a/b # c/d = c/d # a/b where # is a binary operator. For example, # could be addition or multiplication.
W = F x d W = Work F = Force d = Distance
W=FD (W)ork=(F)orce*(D)istance
Yes, torque can have a negative value in physics. Torque is vector energy. Torque is the vector analogue of Work involving force (F) and displacement (D) vectors and the angle (FD). For example Work W = -F.D= -|FD|cos(FD) and Toque T = FxD =|FD|sin(FD). Torque can be negative dependent on the sine(FD). Work and torque is an example of the quaternion nature of physics; for example Quaternion energy E = FD = -F.D + FxD, the real energy is called work F.D and the vector energy is called torque, FxD.