- Source: Combinatorial group theory
In mathematics, combinatorial group theory is the theory of free groups, and the concept of a presentation of a group by generators and relations. It is much used in geometric topology, the fundamental group of a simplicial complex having in a natural and geometric way such a presentation.
A very closely related topic is geometric group theory, which today largely subsumes combinatorial group theory, using techniques from outside combinatorics besides.
It also comprises a number of algorithmically insoluble problems, most notably the word problem for groups; and the classical Burnside problem.
History
See (Chandler & Magnus 1982) for a detailed history of combinatorial group theory.
A proto-form is found in the 1856 icosian calculus of William Rowan Hamilton, where he studied the icosahedral symmetry group via the edge graph of the dodecahedron.
The foundations of combinatorial group theory were laid by Walther von Dyck, student of Felix Klein, in the early 1880s, who gave the first systematic study of groups by generators and relations.
References
Kata Kunci Pencarian:
- Masalah kata untuk grup
- Grup bebas
- Teori grup
- Subgrup karakteristik
- Grup abelian yang dihasilkan tak hingga
- Grup (matematika)
- Presentasi grup
- Matematika diskrit
- Daftar masalah matematika yang belum terpecahkan
- Gelanggang Borromean
- Combinatorial group theory
- Combinatorics
- Word (group theory)
- Presentation of a group
- Free group
- Geometric group theory
- Group theory
- Thin group (combinatorial group theory)
- John Britton (mathematician)
- List of undecidable problems
