972 research outputs found
On linear series with negative Brill-Noether number
Brill-Noether theory studies the existence and deformations of curves in
projective spaces; its basic object of study is , the
moduli space of smooth genus curves with a choice of degree line bundle
having at least independent global sections. The Brill-Noether theorem
asserts that the map is
surjective with general fiber dimension given by the number , under the hypothesis that . One may
naturally conjecture that for , this map is generically finite onto a
subvariety of codimension in . This conjecture fails in
general, but seemingly only when is large compared to . This paper
proves that this conjecture does hold for at least one irreducible component of
, under the hypothesis that . We conjecture that this result should hold for all for some constant , and we give a purely combinatorial conjecture that
would imply this stronger result.Comment: 16 page
Book Review: \u3cem\u3eSacred Matters: Material Religion in South Asian Traditions\u3c/em\u3e
Book Review of Sacred Matters: Material Religion in South Asian Traditions. Edited by Tracy Pintchman and Corinne G. Dempsey. Albany: State University of New York Press, 2015, xi + 221 pp
Optimal agglomeration and regional policy
This paper studies the social desirability of agglomeration and the efficiency arguments for regional policy in a simple, analytically solvable ‘new economic geography’ model with two trade integrating regions. The location pattern emerging as market equilibrium is ?-shaped, featuring dispersion of firms both at high and low trade costs and stable equilibria with partial agglomeration of firms in addition to core periphery equilibria for intermediate levels of trade costs. Our central finding is that the market equilibrium is characterised by over-agglomeration for high trade costs and under-agglomeration for low trade costs. For an intermediate level of trade costs, the market equilibrium yields the socially optimal degree of agglomeration. An important implication of this result is that, on efficiency grounds, regional policy should foster the dispersion of firms for a range of high trade costs only, but agglomeration for a range of low trade costs. Hence, regional policies, such as those pursued by the European Union (which are aimed at fostering dispersion in general), is counterproductive when trade integration is deep enough JEL-Classification: F12, F15, F22, R12, R50 Keywords: economic geography, regional policy, optimal agglomeration, welfare
South Dakota Agricultural Land Market Trends 1991–2008
The 2008 SDSU Farm Real Estate Market Survey report contains information on current agricultural land values and cash rental rates by land use in different regions of South Dakota, with comparisons to values from earlier yearsland values, Acreage, Agricultural Land, Cropland, Farmland, Farms, Land Ownership
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