Ball, W. W. Rouse (Walter William Rouse), 1850-1925 · London, Macmillan · leaf 340
the Proposition. Thedifficulties connected with the subject of parallelism led tovarious attempts to prove the proposition directly and thenceto deduce some property of parallelism equivalent to Euclidspostulate. Substantially this was the method used by Thalesand Pascal. I will mention one or two… … H of a vector. Let ABC be any triangle. Suppose we havea rod AL placed along AB with one end at ^. If we rotateit clockwise round J. as a pivot through the angle BAG itwill move from AL to AK. It will make no difference if wenow slide the rod along AK so that the end moves from A * See A. Cayley,…
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