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Szekeres · source-snapshot-bc3404156f6e
已登记出处中的最早位置:§17.3 · en。
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§17.3 · en · original_transcription · unreviewed
The unit 0-cube is taken to be the singleton . A -cell in a manifold is a smooth map where is an open neighbourhood of in (see Fig. 17.2), and its support is defined as the image of the standard -cube, . A cubical -chain in consists of a formal sum