Question: In what century did prominent Dutch mathematician, Christiaan Huygens, study Tractrix?
Sentence (from "Tractrix"): A tractrix (from the Latin verb "trahere" "pull, drag"; plural: tractrices) is the curve along which an object moves, under the influence of friction, when pulled on a horizontal plane by a line segment attached to a tractor (pulling) point that moves at a right angle to the initial line between the object and the puller at an infinitesimal speed.
Relevant evidence: No