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Explicit Formulae for -values in Positive Characteristic
We focus on the generating series for the rational special values of
Pellarin's -series in indeterminates, and using
interpolation polynomials we prove a closed form formula relating this
generating series to the Carlitz exponential, the Anderson-Thakur function, and
the Anderson generating functions for the Carlitz module. We draw several
corollaries, including explicit formulae and recursive relations for Pellarin's
-series in the same range of , and divisibility results on the numerators
of the Bernoulli-Carlitz numbers by monic irreducibles of degrees one and two.Comment: Some helpful clarifications in the introduction. Final edit, as
appears online in Math.
On self-dual double circulant codes
Self-dual double circulant codes of odd dimension are shown to be dihedral in
even characteristic and consta-dihedral in odd characteristic. Exact counting
formulae are derived for them and used to show they contain families of codes
with relative distance satisfying a modified Gilbert-Varshamov bound.Comment: 8 page
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