pinched solid torus

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Pinch (plasma physics) — For other uses, see Pinch (disambiguation). Lightning bolts illustrating electromagnetically pinched plasma filaments … Wikipedia
Doughnut — For other uses, see Doughnut (disambiguation). A glazed doughnut … Wikipedia
algebraic geometry — Math. the study of sets that are defined by algebraic equations. [1895 1900] * * * Study of geometric objects expressed as equations and represented by graphs in a given coordinate system. In contrast to Euclidean geometry, algebraic geometry… … Universalium

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