The Plucker relations define a projective embedding of the Grassmann variety
Gr(k,n). We give another finite set of quadratic equations which defines the
same embedding, and whose elements all have rank 6. This is achieved by
constructing a certain finite set of linear maps from the pth exterior power of
n-dimensional space to the 2nd exterior power of 4-dimensional space and
pulling back the unique Plucker relation on the latter. We also give a
quadratic equation depending on (p+2) parameters having the same properties.