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[ verb ] meet at a point
Synonyms Used in print (C. R. Wylie, Jr. "Line involutions in S3 whose...)Moreover , if * * f and * * f are two planes intersecting in a line l , tangent to Q at a point P , the two free intersections of the image curves * * f and * * f must coincide at P ' , the image of P , and at this point * * f and * * f must have a common tangent l ' . A final class of exceptional lines is identifiable from the following considerations : Since no two generators of * * f can intersect , it follows that their image curves can have no free intersections . Since two curves of symbol * * f on Q intersect in * * f points , it follows that there are * * f lines of * * f which are tangent to \ g . Moreover , if * * f , no two of the multiple secants can intersect . But if no two lines of the regulus of multiple secants of \ g can intersect , then the regulus must be quadratic , or in_other_words , \ g must be either a * * f or a * * f curve on a nonsingular quadric surface . 
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