If two projective pencils of curves of orders n and
have no common curve, the locus of the intersections of corresponding curves of the two is a curve of order
through all the centers of either pencil. Conversely, if a curve of order
contains all centers of a pencil of order n to the multiplicity demanded by Noether's fundamental theorem,then it is the locus of the intersections of corresponding curves of this pencil and one of order
projective therewith.
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