For subschemes in projective space liaison arises from the geometric notion of linkage. Roughly speaking, two subschemes are directly linked if their union is a complete intersection. The equivalence relation generated by linkage is called liaison. One can also define a finer equivalence relation called biliaison (or even liaison): two subschemes are in the same biliaison class if they are related to each other by an even number of direct links. Thus, in some sense, a biliaison class is "half" of a liaison class. It turns out that biliaison classes are the right object to study in the context of liaison.
|Titolo:||Biliaison Classes of Reflexive Sheaves|
|Relatore/i esterni:||Ellia, Philippe; Walter, Charles|
|Data di pubblicazione:||24-nov-1995|
|Appare nelle tipologie:||8.1 PhD thesis|