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Here is a summary of the main features of the Atlas software.
Also see
See documenation on the atlas library,
and the files atlas.help and atlas-functions.help in the atlas-scripts directory.
The basics
- Complex reductive groups, root systems
- Real Reductive groups, inner classes and forms
- Maximal compact subgroup K(R) and its complexification K
- K orbits on G/B
- Langlands parameters
- Irreducible representations of K
- Branching to K
- Kazhdan-Lusztig-Vogan polynomials
- Composition series and Character formulas
Hermitian Forms and unitarity
- Hermitian representations, invariant Hermitian forms
- The c-invariant form
- Signatures of forms
- Unitarity
- Jantzen filtration
Induction
- Parabolic subgroups, Levi subgroups
- Real parabolic induction and cohomological induction
Structure Theory
- Levi subgroups
- Pseudo-Levi subgroups
- Equal rank reductive subgroups and their poset
- Levi subgroups
The Weyl group
- The Weyl group W
- Conjugacy classes, characters of W
- Character table of W
- Representations of W
- Coherent Continuation
Nilpotent Orbits
- Nilpotent orbit of a complex group
- Nilpotent orbits of a real group
- Component group of centralizer of a nilpotent element
- Special nilpotent orbits
- Duality of nilpotent orbits
- Springer Correspondence
- Associated variety of ideals in the Universal enveloping algebra
- Gelfand Kirillov dimension
Lusztig's theory of the Weyl group
- Generic degree and fake degree
- cells of representations of the Weyl group
- Lusztig's parametrization of representations of W
Unipotent Representations
- Unipotent representations of a real reductive group
- Weak Arthur packets of unipotent representations
Miscellaneous
- structure constants
- The Tits group
- Extended groups
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