crossing number
plural of Poincaré ball
(chiefly historical) A pamphlet or book that slanders a public political figure.
plural of station wagon
(mathematics) The minimum, taken over all planar representations of a link or graph, of the number of times it crosses itself.
2つの結び目が同じかどうかを判断するために、研究者たちは最小交差数や他の不変量を比較した。
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