Wolfgang Heil

Links in S 3 of S 1-category 2 J. C. Gómez-Larrañaga ∗ F. González-Acuña † (2009)

Wolfgang Heil

A non-splittable link of S 1-category 2 is a Burde-Murasugi link. 1 2 1

A Test for Admissibility for Two-Dimensional, Continuous Fields on Planar Surfaces (2007)

Wolfgang Heil

: Radar scatterometers on oceanic satellites provide wind stress data over the oceans except for a 180 ffi ambiguity in direction. Data sets consist of sticks, 2-dimensional vectors of known...

Seifert Unions And Spaces Of Graphs In S (2007)

J. C. Gomez-Larranaga, Wolfgang Heil

Let be a non-splittable graph in S , not a tree. It is shown that if the space M = S N () of is a Seifert union of solid tori then M is homeomorphic to the space of a tree of Burde-Murasugi links.

Fundamental groups of manifolds with S 1-category 2 (2006)

Wolfgang Heil

A closed topological n-manifold M n is of S 1-category 2 if it can be covered by two open subsets W1,W2 such that the inclusions Wi → M n factor homotopically through maps Wi → S 1 → M n. We...

A note on Hempel-McMillan coverings of 3-manifolds (2005)

Wolfgang Heil

Motivated by the concept of A-category of a manifold introduced by Clapp and Puppe, we give a different proof of a (slightly generalized) Theorem of Hempel and McMillan: If M is a closed 3-manifold...

Zur Bestimmung der Angiotensin-I-Converting-Enzyme-Aktivität im Serum [microform] / (1996)

Heil, Wolfgang.

Mikrofiche-Ausg.: Egelsbach ; Frankfurt (Main) ; St. Peter Port : Hänsel-Hohenhausen, 1997. 2 Mikrofiches.

Graphs and projective plaines in 3-manifolds (1986)

Wolfgang Heil, Seiya Negami

Proper homotopy equivalent compact P2-irreducible and sufficiently large 3-manifolds are homemorphic. The result is not known for irreducible 3-manifolds that contain 2-sided projective planes, even...

Graphs and projective plaines in 3-manifolds (1986)

Wolfgang Heil, Seiya Negami

Proper homotopy equivalent compact P2-irreducible and sufficiently large 3-manifolds are homemorphic. The result is not known for irreducible 3-manifolds that contain 2-sided projective planes, even...