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| pretzel= pretzel ...ot]] with four half twists, or as the (5,−1,−1) [[pretzel link|pretzel knot]]. ...

...twists in its first '''tangle''', three left-handed twists in its second, and seven left-handed twists in its third.]] In [[mathematics]], a '''tangle''' is generally one of two related concepts: ...

...mensional [[geometric topology]] (specifically of 4-[[manifold]]s) and the mathematics of [[gauge theory]]. ==Education and career== ...