2,060 research outputs found
Weight enumerators of Reed-Muller codes from cubic curves and their duals
Let be a finite field of characteristic not equal to or
. We compute the weight enumerators of some projective and affine
Reed-Muller codes of order over . These weight enumerators
answer enumerative questions about plane cubic curves. We apply the MacWilliams
theorem to give formulas for coefficients of the weight enumerator of the duals
of these codes. We see how traces of Hecke operators acting on spaces of cusp
forms for play a role in these formulas.Comment: 19 pages. To appear in "Arithmetic, Geometry, Cryptography, and
Coding Theory" (Y. Aubry, E. W. Howe, C. Ritzenthaler, eds.), Contemp. Math.,
201
Counting Numerical Semigroups
A numerical semigroup is an additive submonoid of the natural numbers with
finite complement. The size of the complement is called the genus of the
semigroup. How many numerical semigroups have genus equal to ? We outline
Zhai's proof of a conjecture of Bras-Amor\'os that this sequence has
Fibonacci-like growth. We now know that this sequence asymptotically grows as
fast as the Fibonacci numbers, but it is still not known whether it is
nondecreasing. We discuss this and other open problems. We highlight the many
contributions made by undergraduates to problems in this area.Comment: 14 pages. To appear in American Mathematical Monthly special issue on
research by undergraduate
Distribution of enzymes cleaving pyridine nucleotides in animal tissues
A number of enzymes capable of splitting the pyridine nucleotides have been found in animal tissues. A portion of the DPNase (1) that hydrolyzes the nicotinamide ribose bond of DPN and TPN was reported in the microsomes of rat liver (1). The DPN pyrophosphorylase, first described by Kornberg (2), has been found by Hogeboom and Schneider to be largely localized in the nucleus (3). In previous investigations (4) an enzyme from pigeon liver which splits DPNH and not DPN at the pyrophosphate linkage was described. The present communication deals with the intracellular distribution of enzymes from various species that attack the pyridine coenzymes at the pyrophosphate linkage. The distribution and properties of DPNases from different species and tissues will also be presented
Time, Distance, and Epic Memory in The Tempest
Senior Project submitted to The Division of Languages and Literature of Bard College
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