If V is a 3-dimensional Lie algebra with basis vectors E,F,G

In summary, two different isomorphisms between the vector spaces V and V' are given as \varphi : V \to V' and \bar{\varphi} : V \to V'. However, upon comparing their mappings, it can be concluded that they are the same as \varphi(aE+bF+cG)=\left( \begin{array}{ccc} 0 & a & c\\ 0 & 0 & b\\ 0 & 0 & 0 \end{array} \right) and \bar{\varphi}(E)=\left( \begin{array}{ccc} 0 & 1 & 0\\ 0 & 0 & 0\\ 0
  • #1
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If V is a 3-dimensional Lie algebra with basis vectors E,F,G with Lie bracket relations [E,F]=G, [E,G]=0, [F,G]=0 and V' is the Lie algebra consisting of all 3x3 strictly upper triangular matrices with complex entries then would you say the following 2 mappings (isomorphisms) are different? I had to give an example of 2 different isomorphisms between these vector spaces.

[itex]\varphi : V \to V'[/itex] given by

[itex]\varphi(aE+bF+cG)=\left( \begin{array}{ccc} 0 & a & c\\ 0 & 0 & b\\ 0 & 0 & 0 \end{array} \right)\;,\;\;\;\;\;a,b,c \in \mathbb{C}[/itex]

and [itex]\bar{\varphi} : V \to V'[/itex] given by

[itex]\bar{\varphi}(E)=\left( \begin{array}{ccc} 0 & 1 & 0\\ 0 & 0 & 0\\ 0 & 0 & 0 \end{array} \right)[/itex]

[itex]\bar{\varphi}(F)=\left( \begin{array}{ccc} 0 & 0 & 0\\ 0 & 0 & 1\\ 0 & 0 & 0 \end{array} \right)[/itex]

[itex]\bar{\varphi}(G)=\left( \begin{array}{ccc} 0 & 0 & 1\\ 0 & 0 & 0\\ 0 & 0 & 0 \end{array} \right)[/itex]
 
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  • #2


Those are the same. Can you switch E and F? Is that different? Anyone, Bueller?
 

Related to If V is a 3-dimensional Lie algebra with basis vectors E,F,G

1. What is a 3-dimensional Lie algebra?

A 3-dimensional Lie algebra is a mathematical structure that consists of a vector space with three basis elements, along with a binary operation called the Lie bracket that satisfies certain properties. This algebraic structure is commonly used in the study of symmetry and transformation in mathematics and physics.

2. What does it mean for a Lie algebra to have basis vectors E, F, G?

Having basis vectors E, F, G means that any vector within the Lie algebra can be written as a linear combination of these three basis elements. These basis vectors are typically chosen to represent the generators of the algebra, which have specific properties under the Lie bracket operation.

3. How is the Lie bracket operation defined in a 3-dimensional Lie algebra?

The Lie bracket operation in a 3-dimensional Lie algebra takes two vectors as inputs and produces a third vector as its output. It is defined as the commutator of the two vectors, which is found by taking the vector cross product of the two vectors in the basis E, F, G and then expressing the result in terms of the same basis elements.

4. What are the properties of the Lie bracket operation in a 3-dimensional Lie algebra?

The Lie bracket operation in a 3-dimensional Lie algebra has several properties that it must satisfy, including bilinearity, skew-symmetry, and the Jacobi identity. These properties ensure that the Lie bracket is a valid operation on the algebra and that it captures the underlying algebraic structure.

5. What are some applications of 3-dimensional Lie algebras in science?

3-dimensional Lie algebras have a wide range of applications in science, particularly in the fields of physics, mathematics, and engineering. They are used to study symmetry and transformation in physical systems, as well as in the development of mathematical models for various phenomena. They are also used in the study of differential equations and their solutions.

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