# Algebraic Structures of Symmetric Domains by Ichiro Satake

By Ichiro Satake

This publication is a finished remedy of the overall (algebraic) thought of symmetric domains.

Originally released in 1981.

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**Example text**

3) In particular, 113 1 is a Lie subalgebra, identical to gf(V). Also, for Aegf(V)=ll3, and be V=ll3o, one has [A, b]=Ab. Now let ( V, { } ) be a non-degenerate JTS. For be V, we set p,(x) = {x, b, x) (=P(x)b) (7. P, Ib e VJ c 113,. @_, (7. 5) @o @, We write (a, T, b) for a+ T + p, (a, b E V, Te VD V). ing Proposition 7. 1 (Koecher). X = (a, Then we obtain the follow- 1) @( V, { } ) is a (graded) Lie subalgebra efll3. T, b) and X' = (a', T', b') e @(V, { } ), one has (7. 6) [X, X'] = (Ta' -T'a, 2a'ob+[T, T']-2aob', T'*b-T*b').

Let G be the complex analytic subgroup of GLn( C) corresponding to the § 4. Cartan involutions of reductive R-groups 13 complexification g=gc. Then G is (analytically) reductive and the abelian part (ja is isomorphic to a C-torus. Hence, by Proposition 3. 5, G has a (uniquely determined) C-group structure. , G0, q. e. d. Remark. Without the compactness assumption on Gg, Proposition 3. 6 is false. For instance, let G0 =R~cGL,(R) =Rx. Then, for aeR, the analytic endomorphism e'H-eat ofG0 is extendible to an R-endomorphism of Rx if and only if a is an integer.

3) Chapter I. J). For a homogeneous cone, the converse of this is also true. For later use, we state this in a slightly more general form. Lemma 8. 3. J) which is transitive on Q and self-adjoint. J) 0 • By Lemmas 8. 1, 8. J. The proof of G,=G(Q) 0 will be given later (p. 33). Thus Q is self-dual. Proposition 8. 4 ( Vinberg). Let Q be a homogeneous cone in U. Then there exists an R-group Gin GL(U) such that G0 cG(fJ)cG. J) is conjugate to K. Proof. J)}. J). J. J) 0 x0 = G(Q) 0 Then, since (gx0 ).