In this paper, we prove a new expected dimension formula for certain rank two Brill-Noether loci with fixed special determinant. This answers a question asked by Osserman and also leads to a new and much simpler proof of a theorem in his 2015 work. Our result generalizes the well-known result by Bertram, Feinberg and independently Mukai on expected dimension of rank two Brill-Noether loci with canonical determinant and partially verifies a conjecture (in rank two) of Grzegorczyk and Newstead on coherent systems.
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Univ Illinois, Sci & Engn Off, Dept Math Stat & Comp Sci, 851 South Morgan St, Chicago, IL 60607 USAUniv Illinois, Sci & Engn Off, Dept Math Stat & Comp Sci, 851 South Morgan St, Chicago, IL 60607 USA
Gould, Ben
Liu, Yeqin
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Univ Illinois, Sci & Engn Off, Dept Math Stat & Comp Sci, 851 South Morgan St, Chicago, IL 60607 USAUniv Illinois, Sci & Engn Off, Dept Math Stat & Comp Sci, 851 South Morgan St, Chicago, IL 60607 USA
Liu, Yeqin
Lee, Woohyung
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Univ Illinois, Sci & Engn Off, Dept Math Stat & Comp Sci, 851 South Morgan St, Chicago, IL 60607 USAUniv Illinois, Sci & Engn Off, Dept Math Stat & Comp Sci, 851 South Morgan St, Chicago, IL 60607 USA