18.906 | Spring 2020 | Graduate
Algebraic Topology II
Course Description
This is the second part of the two-course series on algebraic topology. Topics include basic homotopy theory, obstruction theory, classifying spaces, spectral sequences, characteristic classes, and Steenrod operations.
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assignment Problem Sets
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Three spheres made up of circles.
The Hopf fibration shows how the three-sphere can be built by a collection of circles parametrized by points on a two-sphere. This is a frame from an animation of fibers in the Hopf fibration over various points on the two-sphere. (Image and animation courtesy of Niles Johnson.)