Product Code: FOMPOS/4
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Homotopy Groups of SpheresShare this page
One important unsolved problem is the computation of the homotopy groups of spheres, which are formed by the classes of homotopic mappings from one sphere onto another. This picture shows how a large sphere crumples, folds, and layers itself as it maps homotopically onto a smaller sphere. It can also be seen as a haunting image of a castle on the edge of a cliff, against a swirling yellow sky. In color.