demonstrable with empirical evidence

Since then we have had the opportunity to travel in them and were much impressed by the internal styling and comfort of the seating (with the minor exception of the single seats which have been tucked in longitudinally alongside some of the entrance vestibules and which are so cramped that only the slimmest of female figures could be comfortable in them; the space they occupy would have been better utilised to increase standing room).

Before that time the Habsburgians had been for centuries the emperors of the German Holy Roman Empire until they were deposed by Napoleon in 1806.

Any complicated formulas needed (and not easily rederivable) will be given in the exam — so no crib sheets are allowed.