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تسجيل مستخدم جديدA knotted 2-dimensional foam with non-trivial cocycle invariant
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تأليف
J. Scott Carter
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By 2-twist-spinning the knotted graph that represents the knotted handlebody $5_2$, we obtain a knotted foam in 4-dimensional space with a non-trivial quandle cocycle invariant.
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