By Rainer Oloff
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First, we assume that 111 is not empty. Then 111 is a non empty open part of M and in each point p of Ill, we know that (Vh)p = 0. The classical Pick-Berwald theorem then implies that 111 is an open part of a nondegenerate ellipsoid or hyperboloid. Thus detS is a constant different from zero on 111" The continuity of detS then implies that fit = M. Finally, we may assume that S = 0 on the whole of M. Thus by Proposition 2, we can suppose that M is given by the equation z -- P(x,y), where P is a polynomial of degree at most k + 1, and that the canonical affine normal vector field is given by (0,0,1).
N be the Frenet frame of its directrix curve ~o" through ~p2 if and only if (i) n = 2m, (ii) ~ = ~m, (iii) ~o(z) Theorem 5 where z is a stereographic complex coordinate. - ~n(-I/~) be a linearly full minimal L e t %b : S 2 --+ CP n, n - 2m, immersion which factors through ~P~, ~o is k-point ramified for k < 2. and suppose that the directrix curve Let z be a stereographic complex coordinate such that if k ~ 0 then 4o has a higher order singularity at z - O. Then ~o is given by g/o(Z) = /kp zk' + ' " "+ kp ep (t) p-O where e_o .
Remark The condition of factoring through RP 2 is crucial here. result is not true in general. [l]). This, together with Theorem 2, is a first step in dealing with the space of minimal immersions of S ~ into Sn. Finally, combining Theorems 2 and 6, we have the following partial generalisation of Theorem 5. Theorem 7 Let # : S ~ --+ CP n be a linearly full minimal immersion which factors through Rp2. Then up to holomorphic isometries of CP n there are only finitely many minimal immersions of S 2 into CP n which factor through ~p2 and have the same singularity type as ~.
Geometrie der Raumzeit by Rainer Oloff