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Figure I.1 depicts three triangulated spaces. Their main property is that they are glued from simplices: points, segments, triangles, tetrahedra and their higher-dimensional generalizations. Such spaces can be described combinatorially: one has to specify how many simplices of any dimension should be taken and how they should be glued together. Let us give precise definitions.
KeywordsAbelian Group Exact Sequence Topological Space Cohomology Group Geometric Realization
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