Projective Vector Algebra; An Algebra of Vectors Independent of the Axioms of Congruence And of Parallels
The book Projective Vector Algebra; An Algebra of Vectors Independent of the Axioms of Congruence And of Parallels was written by author Ludwik Silberstein Here you can read free online of Projective Vector Algebra; An Algebra of Vectors Independent of the Axioms of Congruence And of Parallels book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Projective Vector Algebra; An Algebra of Vectors Independent of the Axioms of Congruence And of Parallels a good or bad book?
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Vice versa, if 0, S, T, were our original data we could derive from Fig. 2i the way of con- structing the fourth harmonic M (conjugate to Tg), thus : Through S draw two straights l^, l^, and let their termini be T^, Tg ; draw T^O and TgO, cutting /j, l^ in A, B; then AB will cross OT^ in the required point M. We have already called 2X the double of the vector X. Similarly we can call M = |S one-half of S and XM one-half of Y-X, the other diagonal. Thus the above result can now safely be stated ...in the following manner : The diagonals of a plane quadrilateral, whose opposite sides are vectorially equal,* bisect one another. Notice that in virtue of this result (and by Ex. 2) the straight TtM bisects OX, and T^M bisects OY. This gives another^very convenient, method of constructing the 'mid-point' of a given segment. It is scarcely necessary to add that if we write (vectorially) AM=x{AB) and MB=x'{AB), where M is any point of the segment AB, then x + x' = i. For this means only that AM+MB=AB, which was the rule for adding a chain of vectors.
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