1.2 Definition of rods T1 and T2
You have displacement = displacement + displacement * velocity
Also, you're not using $$l$$ on the right hand side, and $$\hat{P_t}$$ should be a function of t.
Do you agree that it defines the inertial rod T1, which is tangent to P at t=0 in S?1. I can't see any useful role for $$\vec{T_1}(t,l) $$
The dimensions don't match in that equation.2. I would expect:
$$\vec{T_2}(t,l) = \vec{P}(t) +\hat{P_t}\vec{v_p}(t)$$
You have displacement = displacement + displacement * velocity
Also, you're not using $$l$$ on the right hand side, and $$\hat{P_t}$$ should be a function of t.
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