Zobrazeno 1 - 10
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pro vyhledávání: '"Jeffrey L. Tollefson"'
Autor:
Jeffrey L. Tollefson
Publikováno v:
Pacific Journal of Mathematics. 183:359-374
We describe an approach to normal surface theory for triangulated 3-manifolds which uses only the quadrilateral disk types (Q-disks) to represent a nontrivial normal surface. Just as with regular normal surface theory, interesting surfaces are among
Autor:
Jeffrey L. Tollefson
Publikováno v:
Topology and its Applications. 65:139-154
Given transversely intersecting normal surfaces S and S ′ in a triangulated 3-manifold M , criteria are given under which inessential intersection curves can be eliminated by a sequence of regular exchanges each of which exchanges a pair of innermo
Autor:
Jeffrey L. Tollefson, Ningyi Wang
Publikováno v:
Proceedings of the American Mathematical Society. 122:635-642
Given a closed, irreducible, orientable 3-manifold M, let x denote the Thurston norm on H 2 ( M ; R ) {H_2}(M;R) . Suppose g, h, and f are three homology classes of H 2 ( M ; Z ) {H_2}(M;Z) carried by a single face of the x-unit sphere in H 2 ( M ; R
Autor:
Jeffrey L. Tollefson
Publikováno v:
Topology and its Applications. 50:63-71
In this paper we use elementary combinatorial methods of PL topology to study the intersection of normal surfaces which are least weight in a homology class. Our point of view is that of Jaco and Rubinstein in which a theory of least weight normal su
Autor:
William Jaco, Jeffrey L. Tollefson
Publikováno v:
Illinois J. Math. 39, iss. 3 (1995), 358-406
Autor:
Jeffrey L. Tollefson, Ningyi Wang
Publikováno v:
Proceedings of the American Mathematical Society. 122:635
Autor:
Jeffrey L. Tollefson
Publikováno v:
Transactions of the American Mathematical Society. 223:223-234
Two problems concerning periodic homeomorphisms of 3-manifolds are considered. The first is that of obtaining systems of incompressible surfaces invariant under a given involution. The second problem is the realization by a periodic homeomorphism of
Autor:
Frank Raymond, Jeffrey L. Tollefson
Publikováno v:
Transactions of the American Mathematical Society. 272:803-807
Autor:
Kyung Whan Kwun, Jeffrey L. Tollefson
Publikováno v:
Transactions of the American Mathematical Society. 203:97-106
We prove that the 3 3 -dimensional torus S 1 × S 1 × S 1 {S^1} \times {S^1} \times {S^1} admits exactly nine nonequivalent PL involutions. With the exception of the four fixed point free ones, the involutions may be distinguished by their fixed poi
Autor:
Jeffrey L. Tollefson, Wolfgang Heil
Publikováno v:
Topology. 22(2):169-172