Lickorish - Introduction to Knot Theory (1991).pdf

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Graduate Texts in Mathematics
175
Editorial Board
s. Axler F.W. Gehring K.A. Ribet
Springer
New York
Herlin
Ileidelberg
Harcelona
Hudapest
I long Kong
I,olldon
Milan
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W.B. Raymond Lickorish
An Introduction to
Knot Theory
With 114 Illustrations
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W.B. Raymond Lickorish
Professor of Geometric Topology, University of Cambridge,
and Fellow of Pembroke College, Cambridge
Department of Pure Mathematics and Mathematical Statistics
Cambridge CB2 ISB
England
Editorial Board
S. Axler
Mathematics Department
San Francisco State
University
San Francisco, CA 94132
USA
F.W. Gehring
Mathematics Department
East Hall
University of Michigan
Ann Arbor, MI 48109
USA
K.A. Ribet
Department of Mathematics
University of California
at Berkeley
Berkeley, CA 94720
USA
"',
Mathematics Subject Classification (1991): 57-01, 57M25, 16534, 57M05
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Preface
'fhis account is an introduction to mathematical knot theory, the theory of knots
and links ofsimple closed curves in three-dimensional space. Knots can be studied
at lTIany levels and from lTIany points of view. They can be admired as artifacts of
the decorative arts and crafts, or viewed as accessible intimations ofa geometrical
sophistication that may never be attained. The study of knots can be given some
ITIotivation in terms of applications in molecular biology or by reference to paral-
lels in equilibrium statistical mechanics or quantum field theory. Here, however,
knot theory is considered as part of geometric topology. Motivation for such a
topological study of knots is meant to come from a curiosity to know how the ge-
olnetry of three-dimensional space can be explored by knotting phenolnena using
precise Inathematics. The aim will be to find invariants that distinguish knots, to
investigate geolTIetric properties of knots and to see something of the way they
interact with lnore adventurous three-dimensional topology. The book is based on
an expanded version of notes for a course for recent graduates in mathematics
given at the University of Cambridge; it is intended for others with a similar level
of mathematical understanding. In particular, a knowledge of the very basic ideas
of the fundamental group and of a simple homology theory is assumed; it is, after
all, more important to know about those topics than about the intricacies of knot
theory.
There are other works on knot theory wri tten at this level; indeed most of them
are listed in the bibliography. However, the quantity of what may reasonably be
tcnned mathematical knot theory has expanded enormously in recent years. Much
of the newly discovered material is not particularly difficult and has a right to be
included in an introduction. This makes some ofthe excellent established treatises
SCCITI a I ittle dated. However, concentrating entirely on developments of the past
decade gives a lTIOSt misleading view of the subject. An attempt is made here to
outline sOlne of the highlights from throughout the twentieth century, with a little
hias towards recent discoveries.
'rhe present size of the subject Incans that a choice of topics must be ITIade for
Illclusion in any first course or book of reasonable length. Such selection nlust hc
suhjective. I\n attcillpt has heen Inade here to give the flavour and the results rrolll
lhree or f()tlr 1l1aln tlThlliqul's and not 10 heroillc unduly l'lllllL'shcd ill allY orthclll.
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