quadrisecant造句

• In her thesis, she established that every piecewise linear knot in general position ( other than the unknot ) has a quadrisecant, i . e ., four collinear points.
• If five lines are given in a three-dimensional space, such that all five are intersected by a common line " b " 6 but are otherwise in general position, then each of the five quadruples of the lines " a " " i " has a second quadrisecant " b " " i ", and the five lines " b " " i " formed in this way are all intersected by a common line " a " 6.