Bounded, separating, incompressible surfaces in knot manifolds.
P.B. Shalen, M. Culler (1984)
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P.B. Shalen, M. Culler (1984)
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A Wirtinger presentation of a knot group is obtained from a diagram of the knot. T. Yajima showed that for a 2-knot or a closed oriented surface embedded in the Euclidean 4-space, a Wirtinger presentation of the knot group is obtained from a diagram in an analogous way. J. S. Carter and M. Saito generalized the method to non-orientable surfaces in 4-space by cutting non-orientable sheets of their diagrams by some arcs. We give a modification to their method so that one does not need...
Michael H. Freedman (1982)
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