ABSTRACT
In this section we study the first case in view of the definitions given in Section 3.3: common zeros of U 0 T ℙ n https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003072232/b5eea213-b2d6-45d8-8b64-9c7995452ac2/content/eq414.tif"/> and ℚ n+1 , and some of its consequences. To simplify notation we drop the subindex to write U for U 0 recall that () U : r n d × r n d − σ rank U = r n d − σ . https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003072232/b5eea213-b2d6-45d8-8b64-9c7995452ac2/content/eq415.tif"/>
