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By Jean-Jacques Samueli, Jean-Claude Boudenott

ISBN-10: 2729827889

ISBN-13: 9782729827885

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Generality is a key price in medical discourses and practices. all through background, it has acquired a number of meanings and of makes use of. This selection of unique essays goals to inquire into this variety. via case stories taken from the historical past of arithmetic, physics and the existence sciences, the publication offers facts of other methods of figuring out the final in numerous contexts.

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E. according to whether k = 2 or k = 3. 9gn9 which by the lemma to the Theorem 39 must exist. In both cases S is a linear subspace of dimension k — 1 (passing through P), and £#,·(/ = 1 , n ) is — independently of i — a linear subspace of dimension k (this subspace being equal to SR for k = 3). ,«). e. the corollary is implied by the theorem. § 23. Coplanar Desargues Configurations An important complement of Theorem 7 is given by: THEOREM 41 (Desargues' Theorem for a plane). A coplanar Desargues configuration is central if and only if it is axial.

Consequently cZ intersects the side (AA') of the triangle under discussion. Now if the angle (9193) dealt with is two-dimensional, then it lies in the plane AA'B; further, c is a point and cZ a line of this plane, so cZ represents a transversal of the triangle (AA'B), which implies that cZ intersects one of the segments (AB), (A'B). HALF-PENCILS. ANGLES 49 On the other hand, if the angle (2193) is three-dimensional, then c is a line and cZ a plane. Starting from this and applying Theorem 10 we can draw the same conclusion as above.

Suppose that {P, O, P'}. Then we have either {O, β, Q'} or {Q, β', O}. These two cases are not essentially different, as they pass from one to the other by the simultaneous interchanges Ρ «-> P' and Q Q'. It will therefore be sufficient to discuss the case {O, β, Q'} (Fig. 51). The line PQ is a transversal of the triangle (OP'Q') intersecting the side (OQ') in the point β, not intersecting side (OP) and therefore intersecting (P'Q') and so P'Q' also. 3. Now suppose that {Ρ,Ρ',Ο}. Then we have {Ο,Ρ',Ρ}, so that, in fact, this case is the same as the first one.

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30 ouvrages de mathématiques qui ont changé le monde by Jean-Jacques Samueli, Jean-Claude Boudenott


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