By Melvin Hausner

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**Additional info for A Vector Space Approach to Geometry**

**Sample text**

The two possible orientations are given by P → Q and by Q → P. These are called opposite orientations. 2 A vector is “almost” an oriented line segment. However, in Fig. 2, we wish to say that P → Q and P′ → Q′ determine the same vector, despite the obvious fact that they are not the same oriented line segment. [Analogously, two numbers p and q determine a number p + q. Thus 3 and 7 “determine” 10, and so do –1 and 11. ] Intuitively, we wish to have P → Q and P′ → Q′ determine the same vector if we can push P → Q into P′ → Q′ (no rotations allowed).

Negative Masses. We have already given a meaning to the equation Specifically, it means and may be interpreted geometrically as in Fig. 56. It should not surprise the reader to learn that we may also write (1) as Looking at Fig. 56, we may think of the negative mass –2 at R repelling P away from R, and this explains why P is not between Q and R. But we may also very nicely explain Eq. (3) in terms of point of division. In general, was taken to mean that P is on segment QR and (See Fig. ) While m and n were understood positive in (4), we are nevertheless going to compare (3), (4), and (5).

Thus, the interplay between geometry and other subjects enriches them both. The reader of this book will find it quite possible to omit many sections without affecting his understanding of the later sections. The core of the book, however, will be found in Chapters 1 through 4, 6, 8, and 10. Similarly, an instructor using this book as a classroom text should find ample material for either a term course or a year course. The author has used Chapters 1 through 5 as the basis for the first term’s work, and 6 through 11 for the second term.