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In knot theory, a branch of mathematics, a twist knot is a knot obtained by repeatedly twisting a closed loop and then linking the ends together. (That is, a twist knot is any Whitehead double of an unknot.) The twist knots are an infinite family of knots, and are considered the simplest type of knots after the torus knots. ==Construction== A twist knot is obtained by linking together the two ends of a twisted loop. Any number of half-twists may be introduced into the loop before linking, resulting in an infinite family of possibilities. The following figures show the first few twist knots: Image:One-Twist Trefoil.png|One half-twist (trefoil knot) Image:Blue Figure-Eight Knot.png|Two half-twists (figure-eight knot) Image:Blue Three-Twist Knot.png|Three half-twists (52 knot) Image:Blue Stevedore Knot.png|Four half-twists (stevedore knot) Image:Blue 7_2 Knot.png|Five half-twists (72 knot) Image:Blue 8_1 Knot.png|Six half-twists (81 knot) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「twist knot」の詳細全文を読む スポンサード リンク
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