# Positivity in algebraic geometry by R. K. Lazarsfeld

By R. K. Lazarsfeld

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Example text

JRn+l, defined by a(x) = -x, obviously commutes with every orthogonal transformation of IRn+l; consequently, spherical geometry is antipodally symmetric. The antipodal symmetry of spherical geometry leads to a duplication of geometric information. For example, if three great circles of S2 form the sides of a spherical triangle, then they also form the sides of the antipodal image of the triangle. 3 for an illustration of this duplication. The antipodal duplication in spherical geometry is easily eliminated by identifying each pair of antipodal points x, -x of sn to one point ±x.

Arc Length Definition: The length of a curve I'YI = 'Y : [a, b] -+ X is sup { £b, P) : P E P[a, bJ}. Note that since {a, b} is a partition of [a, b], we have db(a),'Y(b)) ::; Definition: A curve Example: Let of [a, b]. 'YI ::; 00. rectifiable if and only if -+ I'YI < 00. X be a geodesic arc and let P be a partition m 0=1 m L(to - to-I) b - a. 1. Let'Y: [a, c] a and c, and let Then we have Moreover'Y 0: : [a, b] -+ -+ X be a curve, let b be a number between (3 : [b, c] -+ X be the restrzctwns of 'Y.

As T(x, y, z) is the polar triangle of T', we have a' = 7f - a, (3' = 7f - b, "I' = 7f - c. "I) - cos(7f ). sm(7f - a sm(7f - (3) o Area of Spherical Triangles A lune of 8 2 is defined to be the intersection of two distinct, nonopposite hemispheres of 8 2 • Any lune of 8 2 is congruent to a lune L(a) defined in terms of spherical coordinates (¢, 0) by the inequalities 0 ~ 0 ~ a. Here a is the angle formed by the two sides of L(a) at each of its two vertices. 3. 5, we have Area(L(a» = 100: 10 7r sin¢d¢dO = 20..