Browsing by Author "Wijesiri G S"

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Codes over rings of size p2 and lattices over imaginary quadratic fields

Shaska T; Shore C; Wijesiri G S (Finite Fields Appl., 2010)

Let ?>0 be a square-free integer congruent to 3 mod 4 and OK the ring of integers of the imaginary quadratic field View the MathML source. Codes C over rings OK/pOK determine lattices ??(C) over K . If p?? then the ring ...
Degree 4 coverings of elliptic curves by genus 2

Shaska T; Wijesiri G S; Wolf S; Woodland L (Albanian J. Math., 2008)

Genus two curves covering elliptic curves have been the object of study of many articles. For a ?xed degree n the subloci of the moduli space M_2 of curves having a degree n elliptic subcover has been computed for n=3,5 ...
Theta nulls of cyclic curves of small genus

Previato E; Shaska T; Wijesiri G S (Albanian J. Math., 2007)

We study relations among the classical thetanulls of cyclic curves, namely curves X (of genus g(X)>1) with an automorphism ? such that ? generates a normal subgroup of the group G of automorphisms, and g(X???? )=0 .0. ...
Thetanulls of cyclic curves of genus 4

Wijesiri G S (Annual research symposium, FGS, University of Kelaniya, Kelaniya, 2013)

Let ? be an irreducible smooth projective curve of genus g>1 defined over the complex field C. When the curve is hyperelliptic, the curve has extra automorphism ? and has an equation y^2=f(x), where x is an affine coordinate ...

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