For two different integral forms K of the exceptional Jordan algebra we show that Aut K is generated by octave reflections. These provide ''geometric'' examples Ž . of discrete reflection groups acting with finite covolume on the octave or Cayley 2 Ž hyperbolic plane ޏH , the exceptional rank one
Hyperbolic Plane Reflections and the Hall–Janko Group
✍ Scribed by Kenny Ching
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 193 KB
- Volume
- 223
- Category
- Article
- ISSN
- 0021-8693
No coin nor oath required. For personal study only.
✦ Synopsis
We introduce the notion of a hyperbolic plane reflection in symplectic space over a finite field of characteristic 3 and show that the group 2 HJ, where HJ is the Hall᎐Janko simple group, is generated by a set of 315 hyperbolic plane reflections in symplectic 6-space.
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