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In [4], R. Hamilton has proved that if a compact manifold M of dimension three admits a C ∞ Riemannian metric g 0 with positive Ricci curvature, then it also admits a metric g with constant positive sectional curvature, and is thus a quotient of the sphere S 3. In fact, he shows that the original metric can be deformed into the constant-curvature metric by… (More)

- Jason Cantarella, Dennis DeTurck, Herman Gluck
- The American Mathematical Monthly
- 2002

Introduction. A number of authors [C], [DW1], [DW2], [L], [T] have studied minimal isometric immersions of Riemannian manifolds into round spheres, and in particular of round spheres into round spheres. As was observed by T. Takahashi [T], if Φ: M → S N (r) ⊂ R N +1 is such a minimal immersion, then the components of Φ must be eigenfuctions of the Laplace… (More)

- Dennis Deturck, Herman Gluck, Rafal Komendarczyk, Paul Melvin, Clayton Shonkwiler, David Shea Vela-Vick +4 others
- 2009

To Manfredo do Carmo in friendship and admiration, on his 80 th birthday Abstract. Three-component links in the 3-dimensional sphere were classified up to link homotopy by John Milnor in his senior thesis, published in 1954. A complete set of invariants is given by the pairwise linking numbers p, q and r of the components, and by the residue class of one… (More)

The writhing number of a curve in Euclidean 3-space, introduced by C˘ alug˘ areanu (1959-61) and named by Fuller (1971), is the standard measure of the extent to which the curve wraps and coils around itself; it has proved its importance for molecular biologists in the study of knotted duplex DNA and of the enzymes which affect it. The helicity of a vector… (More)

To Julius Shaneson on the occasion of his 60th birthday

- Jason Cantarella, Dennis DeTurck, Herman Gluck, Mikhail Teytel
- 1998

The helicity of a smooth vector field defined on a domain in 3-space is the standard measure of the extent to which the field lines wrap and coil around one another; it plays important roles in fluid mechanics, magnetohy-drodynamics and plasma physics. In this report we show how the relation between energy and helicity of a vector field is influenced by the… (More)

- Jason Cantarella, Dennis DeTurck, Herman Gluck, Mikhail Teytel
- 1999

This paper presents a mathematically complete derivation of the minimum-energy divergence-free vector fields of fixed helicity, defined on and tangent to the boundary of solid balls and spherical shells. These fields satisfy the equation ∇×V = λV , where λ is the eigenvalue of curl having smallest non-zero absolute value among such fields. It is shown that… (More)

- Frederick Michael Butler, Dennis DeTurck, Herman Gluck, David Harbater, Andre Scedrov, James Haglund
- 2004

Acknowledgments I would like to thank James Haglund, who embodies all the characteristics of a great advisor and a great mathematician. He made the difficult task of writing a dissertation an enjoyable experience. Many other people from the Penn mathematics department, including helped to make this dissertation possible. Thanks also to the mathematics… (More)

- DENNIS DETURCK, HERMAN GLUCK, PETER STORM, Dennis DeTurck, Herman Gluck, Peter Storm
- 2013

Given a Hopf fibration of a round sphere by parallel great subspheres, we prove that the projection map to the base space is, up to isometries of domain and range, the unique Lipschitz constant minimizer in its homotopy class. Similarly, given a Hopf fibration of a round sphere by parallel great circles, we view a unit vector field tangent to the fibers as… (More)