Mathematics – Algebraic Geometry
Scientific paper
2008-03-14
Ann. Inst. Fourier (Grenoble) 59 (2009) 2429-2444
Mathematics
Algebraic Geometry
11 pages
Scientific paper
We consider the Springer fiber ${\mathcal B}_u$ corresponding to a nilpotent endomorphism $u$ of nilpotent order 2. As a first result, we give a description of the elements of a given component of ${\mathcal B}_u$ which are fixed by the action of the standard torus relative to some Jordan basis of $u$. By using this result, we establish a necessary and sufficient condition of singularity for the components of ${\mathcal B}_u$.
Fresse Lucas
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