You are discussing the inertia tensor. You have these lines about halfway down
T = F x s (force times distance, x is the cross product)
substuting F=m a gives,
T = m * s x a
therefore defining h = m * s gives
T = h x a
T = F x s
is incorrect. The correct equation is T = R X F where R is the distance vector.
This would make the rest of your derivation correct. Starting with T = F X
s and then ending with T = m*s X a would imply that the cross product is communitive,
which it is not.
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