An Exact Sequence of Braid Groups.
Charles H. Goldberg (1973)
Mathematica Scandinavica
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Charles H. Goldberg (1973)
Mathematica Scandinavica
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R. Fox, L. Neuwirth (1962)
Mathematica Scandinavica
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Francisco González-Acuña (1994)
Revista Matemática Iberoamericana
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A n-knot group is the fundamental group of the complement of an n-sphere smoothly embedded in Sn+2. Artin gave in 1925 ([A]) an algebraic characterization of 1-knot groups. M. Kervaire gave in 1965 ([K]) an algebraic characterization of n-knot groups for n ≥ 3. The problem of characterizing algebraically 2-knot groups has been posed several times (see for example [Su, Problem 4.7]). Ribbon 2-knot groups have been characterized algebraically by Yajima [Y]. ...
Mangum, Brian, Stanford, Theodore (2001)
Algebraic & Geometric Topology
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Lee Rudolph (1989)
Revista Matemática de la Universidad Complutense de Madrid
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This is a survey (including new results) of relations ?some emergent, others established? among three notions which the 1980s saw introduced into knot theory: quasipositivity of a link, the enhanced Milnor number of a fibered link, and the new link polynomials. The Seifert form fails to determine these invariants; perhaps there exists an ?enhanced Seifert form? which does.
Carl G., Jr. Jockusch (1972)
Mathematica Scandinavica
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J.W. Jenkins (1974)
Mathematica Scandinavica
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Bernard Maskit (1975)
Mathematica Scandinavica
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Troels Jorgensen (1974)
Mathematica Scandinavica
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Craig C. Squier (1994)
Mathematica Scandinavica
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HERBERT BUSEMANN, FLEMMING P. PEDERSEN (1955)
Mathematica Scandinavica
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Eric P. Klassen (1993)
Forum mathematicum
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