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Mannigfaltikäit
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Under ere Mannigfaltigkäit verstoot mä in dr Mathematik e topologische Ruum, wo lokal em euklidische Ruum gliicht. Global muess d Mannigfaltigkäit aber nid eme euklidische Ruum gliiche, muess also nit mit em homöomorf si.
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Mannigfaltigkäite si dr zentrali Geegestand vo dr Differenzialgeometrii. Si häi bedütendi Aawändige in dr theoretische Füsik.