By H.S.M. Coxeter

ISBN-10: 0387406239

ISBN-13: 9780387406237

ISBN-10: 0387965327

ISBN-13: 9780387965321

ISBN-10: 3540965327

ISBN-13: 9783540965329

In Euclidean geometry, structures are made with ruler and compass. Projective geometry is less complicated: its structures require just a ruler. In projective geometry one by no means measures whatever, as a substitute, one relates one set of issues to a different by way of a projectivity. the 1st chapters of this publication introduce the real suggestions of the topic and supply the logical foundations. The 3rd and fourth chapters introduce the well-known theorems of Desargues and Pappus. Chapters five and six utilize projectivities on a line and airplane, repectively. the following 3 chapters boost a self-contained account of von Staudt's method of the idea of conics. the trendy method utilized in that improvement is exploited in bankruptcy 10, which bargains with the best finite geometry that's wealthy sufficient to demonstrate all of the theorems nontrivially. The concluding chapters convey the connections between projective, Euclidean, and analytic geometry.

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**Additional info for Projective Geometry, 2nd Edition **

**Sample text**

Let two triangles, PQR and P'Q'R' (coplanar or noncoplanar) be perspective from a point 0. 14 that their three pairs of corresponding sides meet, say in D, E, F. 3A. Consider the two triangles PP'E and QQ'D. 31), perspective from a point, namely, from the point PQ P'Q' = F. That is, the three points E, D, F are collinear. 3 1, the converse of Desargues's theorem, happens to be easier to prove ab initio than Desargues's theorem itself. 32 first (as in Reference 7, p. 32 to the triangles PP'E and QQ'D.

12 THE FUNDAMENTAL THEOREM OF PROJECTIVE GEOMETRY: A projec- tivity is determined when three collinear points and the corresponding three collinear points are given. " Thus each of the relations ABC A A'B'C', ABC 7C abc, abc A ABC, abc 7 a'b'c' THE FUNDAMENTAL THEOREM 35 suffices to specify uniquely a particular projectivity. On the other hand, each of the relations ABCD n A'B'C'D', ABCD n abcd, abcd n a'b'c'd' expresses a special property of eight points, or of four points and four lines, or of eight lines, of such a nature that any seven of the eight will uniquely determine the remaining one.

5. 2. Could this be developed into a proof of Pappus's theorem? 6. If one triangle is inscribed in another, any point on a side of the former can be used as a vertex of a third triangle which completes a cycle of Graves triangles (each inscribed in the next). 7. Assign the digits 0, 1, ... , 8 to the nine points of the Pappus configuration in such a way that 801, 234, 567 are three triads of collinear points while 012, 345, 678 is a cycle of Graves triangles. (E. S. *) * In his answer to an examination question.

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