Published online by Cambridge University Press: 09 April 2009
Let be a p×q matrix of linear forms in the n+1 coordinates in a projective space Πn. Then points which satisfy the q equations
in general span a space Πn-q, but will span a space Πn-q+1 if a set μ,={μβ of multipliers can be found such that
Such a set μ can be found if and only if the equations
have solutions.