Topics in Low-Dimensional Topology by A Banyaga, H Movahedi-Kankarani, R Wells

By A Banyaga, H Movahedi-Kankarani, R Wells

Contemporary luck with the 4-dimensional Poincare conjecture has revived curiosity in low-dimensional topology, in particular the 3-dimensional Poincare conjecture and different facets of the issues of classifying 3-dimensional manifolds. those difficulties have a motive force, and feature generated a very good physique of study, in addition to insight.The major issues taken care of during this ebook comprise a paper via V Poenaru at the Poincare conjecture and its ramifications, giving an perception into the herculean paintings of the writer at the topic. Steve Armentrout's paper on "Bing's dogbone house" belongs to the subjects in third-dimensional topology encouraged by way of the Poincare conjecture. S Singh supplies a pleasant synthesis of Armentrout's paintings. additionally incorporated within the quantity are shorter unique papers, facing just a little various features of geometry, and devoted to Armentrout through his colleagues -- Augustin Banyaga (and Jean-Pierre Ezin), David Hurtubise, Hossein Movahedi-Lankarani and Robert Wells.

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Armentrout is an excellent teacher. He spent one year at Wisconsin and was impressed with the enthusiasm he engendered among the students who liked to tackle hard problems. He has an excellent publication record. " Back to the Future: We now quote excerpts from R. L. Moore's letter of recommendation, dated Dec. 13, 1955, to Professor Knowler (Univ. of Iowa) [copy obtained from Moore's archives at the University of Texas, Austin]: "During our phone conversation earlier this year, I spoke of Mr.

We also need to define X 21 . From this point on, no sets are added to X 1PI but some may be deleted. We may show that if 1 ~ t ~ PI and 021 intersects Bdo lt , then Olt C 021. In that case, we delete Olt from X lpl ' Then X 21 is obtained from X 1PI by making all such deletions. It is clear that X 21 and Y21 are disjoint, sinceg21(X2J) C Toe1 andg21 (Y21 ) C T oe2 . In a similar manner, we modify g21 to obtain g22' If D22 is obtained by a modification in T oe2 , we first consider the location of 022 relative to X 21 .

The discs A* constructed in this way contain F n D. Any two such discs are either disjoint or one contains the other. The discs A* may intersect E. Any such point of E lies on an arc of intersection of E with F, having both endpoints on (A. If A* is a disc as above, and EnA* f:. 0, let r be a component of E n A*, and make a construction similar to that above to obtain an analogous polyhedral sub disc r* of A * related to E as A * is to D. We may continue this process, defining discs in F relative to D and E alternately.

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