“tractrix”的概念、定义、翻译、参考文献-科学参考

单词	tractrix
释义	tractrix Mathematics If a massive particle is placed at (0,1) and pulled on an inelastic unit-length string by someone walking from the origin along the x-axis, then the curve traced out by the particle is called the tractrix. The tractrix can be parameterized as $x = t - tanh t, y = sech t, (t \geq 0) .$ The surface of revolution formed by rotating the tractrix about the x-axis is called the tractoid. It has constant Gaussian curvature –1.
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