Monday, 26 January 2009

ag.algebraic geometry - Smoothness and fullness of determinantal varieties

So, I'm in the following situation:



I have vector spaces H,V, and a map A:Hlongrightarrowhom(H,V), sending x to Ax (notation); i need to consider the variety



Sigma1(A)=[x]inmathbbP(H)|rank(Ax)leq1.



Mostly, I'm interested in wether this variety is smooth, reducible, and/or full (by full, i mean not contained in any proper projective subspace).



Are there any conditions on A that allow me to know any of these properties?



I don't know what A is, but here is a couple of things i know:



  1. A has no kernel;


  2. If I define hatA:Vlongrightarrowhom(H,H) by hatAv(x):=Ax(v), then hatAv is skew-symmetric for all vinV.


Many thanks in advance!

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