# Toroidal Compactification of Siegel Spaces by Y. Namikawa

By Y. Namikawa

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W and 0 W X 0 ! ii/ for i D 1; : : : ; n, every base-point of 'i is a base-point of 'n : : : 'i . Proof. 5] (see also the appendix of [5]). Let us give an idea of the strategy here, and refer to [9] for the details. a; r; m/ (see Definition at page 601 of [9]). The number a 2 Q is given by the degree of the linear system HX on X associated with , the number r 2 N is the maximal multiplicity of the base-points of this system and m is the number of base-points that realise this maximum. i/ If r > a, we denote by W XO !

We claim that enC1 m D 0. ei ej 1Äi

BenC1 / D 0 for all b 2 m. x0 ; : : : ; xnC1 / D 0 of the hyperplane H only in the term x0d 1 xnC1 . Thus the point Œ0 W : : : W 0 W 1 lies on H and it is singular provided d 3. It remains to note that the only smooth quadric is a non-degenerate one. t u Proposition 5. H /0 is reductive. Then H is either a hyperplane or a non-degenerate quadric. Proof. By Proposition 1, the variety H is smooth, and the assertion follows from Proposition 4. t u 26 I. Arzhantsev and A. Popovskiy Remark 3. R; W; F / as in Definition 3 and consider the sum I of all ideals of the algebra R contained in W .