Let G be a connected tight single Lie-group and g be the Lie algebra of G. Let Aut(G) be the self-isomorphism group of G, Aut (g) the self-isomorphism of g, and Aut(g) the self- isomorphism group of Aut(g). All concomitant representations of the form Ad(g) (g = G) form the inner self-isomorphism group Ad(g) of g. Let (., .) be the Ad(g)-invariant positive definite inner product of Ad(g) on g, g. the invariant positive definite inner product, b the Cartan subalgebra of g, AC b the root system of (y, b), and W the Weyl group corresponding to A. Determine if the following proposition is correct, and prove your conclusion. - Aut(G) = Aut(g). Aut(g) = Ad(g). - If & € Aut(g) and (b) = b, then 6 € W.

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These questions are from a branch of mathematics known as Lie group theory. This is a field of study that combines algebraic structures (groups) with differential structures (manifolds). Lie groups play a crucial role in many areas of mathematics and physics, including but not limited to differential equations, quantum mechanics, and general relativity. In this theory, a "Lie algebra" is a way of describing a Lie group using vector spaces and a specific binary operation "[ , ]" to capture properties of the Lie group.
4.
Let G be a connected tight single Lie-group and g be the Lie algebra of G. Let Aut(G) be the
self-isomorphism group of G, Aut(g) the self-isomorphism of g, and Aut(g) the self-
isomorphism group of Aut(g). All concomitant representations of the form Ad(g)(g = G) form
the inner self-isomorphism group Ad(g) of g. Let (., .) be the Ad(g)-invariant positive definite
inner product of Ad(g) on g, g.
the invariant positive definite inner product, b the Cartan subalgebra of g, AC b the root system
of (y, b), and W the Weyl group corresponding to A. Determine if the following proposition is
correct, and prove your conclusion.
Aut(G) = Aut(g).
- Aut(g) = Ad(g).
- If þ ¤ Aut(g) and þ(b) = b, then þ|₁ € W.
b
- Vo € W, there exists & € Ad(g), such that (b) = b and þ|₁
= 0.
- Let o be an orthogonal transformation on (b, (., ∙)), then there exists & € Aut(g) such that
(b) = b and 6: = o is sufficient for o(8) = 8.
Transcribed Image Text:4. Let G be a connected tight single Lie-group and g be the Lie algebra of G. Let Aut(G) be the self-isomorphism group of G, Aut(g) the self-isomorphism of g, and Aut(g) the self- isomorphism group of Aut(g). All concomitant representations of the form Ad(g)(g = G) form the inner self-isomorphism group Ad(g) of g. Let (., .) be the Ad(g)-invariant positive definite inner product of Ad(g) on g, g. the invariant positive definite inner product, b the Cartan subalgebra of g, AC b the root system of (y, b), and W the Weyl group corresponding to A. Determine if the following proposition is correct, and prove your conclusion. Aut(G) = Aut(g). - Aut(g) = Ad(g). - If þ ¤ Aut(g) and þ(b) = b, then þ|₁ € W. b - Vo € W, there exists & € Ad(g), such that (b) = b and þ|₁ = 0. - Let o be an orthogonal transformation on (b, (., ∙)), then there exists & € Aut(g) such that (b) = b and 6: = o is sufficient for o(8) = 8.
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