Abstract
Free groups first appeared in mathematics as subgroups of the modular group in complex function theory. When Dyck 1882 pointed out the fundamental role of free groups in combinatorial group theory, as the most general groups from the point of view of generators and relations, his picture of them remained the function-theoretic one—a tessellation of the unit disc by curvilinear triangles whose sides were circular arcs orthogonal to the disc boundary. The first mathematician to study free groups in their own right and discover significant theorems about them was Jakob Nielsen (see Nielsen 1918, 1919, 1921), in fact the term “free group” did not appear until Nielsen 1924a. Nielsen’s technique is partly geometric (based on the length of words and “cancellation,” see exercise 2.2.4.1 below), however, it suppresses the natural geometric structure of a free group by imposing a “ linear” appearance on the elements as strings of letters.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Author information
Authors and Affiliations
Rights and permissions
Copyright information
© 1993 Springer-Verlag New York Inc.
About this chapter
Cite this chapter
Stillwell, J. (1993). Graphs and Free Groups. In: Classical Topology and Combinatorial Group Theory. Graduate Texts in Mathematics, vol 72. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-4372-4_3
Download citation
DOI: https://doi.org/10.1007/978-1-4612-4372-4_3
Publisher Name: Springer, New York, NY
Print ISBN: 978-0-387-97970-0
Online ISBN: 978-1-4612-4372-4
eBook Packages: Springer Book Archive