Kac Moody Algebras from Generalized Cartan Matrices — Examples
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1 · Prerequisites
Abstract Algebra
Lie Theory
Linear Algebra
Real Analysis
- Construction of the Real Numbers via Cauchy Sequences
- Construction of the Real Numbers via Dedekind Cuts
- Countability and Uncountability
- Foundations of the Real Numbers for Analysis
- Monotone Sequences, Bolzano-Weierstrass, and Cauchy Completeness
- Rⁿ as a Normed Space; Vector-Valued Functions
- Roots, Rational Powers, and Classical Inequalities
- Sequences and Limits
- Suprema and Infima
Set Theory
2 · Logical flowchart
3 · Items
Example
Rank one gcm recovers sl2
Example
The a2 serre relations
Example
The affine a1 gcm has singular rank one realization data
Example
A symmetrizable indefinite rank two gcm
Counterexample
A matrix with one zero off diagonal is not a gcm
Counterexample
Imaginary root spaces need not have multiplicity one
Sources
- Kleshchev, Lectures on Infinite Dimensional Lie Algebras — Example 1.5.2, pp.20–21; explicit 2×2 computation
- Kleshchev, Lectures on Infinite Dimensional Lie Algebras — Example 1.5.2, pp.20–21; complete A2 matrix calculation
- Kleshchev, Lectures on Infinite Dimensional Lie Algebras — Example 1.2.3 and Proposition 1.2.4, pp.10–12; affine A1 data in Example 1.5.4, pp.23–24
- Kleshchev, Lectures on Infinite Dimensional Lie Algebras — §4.1 and Theorem 9.3.5, pp.50–57 and 125–126; local degree-(1,1) calculation
- Kleshchev, Lectures on Infinite Dimensional Lie Algebras —
- Kleshchev, Lectures on Infinite Dimensional Lie Algebras — Proposition 1.5.1, Lemma 1.5.3 and Example 1.5.4, pp.20–25; fully computed loop-sl3 adaptation