Ultradifferentiable functions on smooth plane curves

Non-trivial Linear Systems on Smooth Plane Curves

Let C be a smooth plane curve of degree d defined over an algebraically closed field k. In [10], while studying space curves, Max Noether considered the following question. For n ∈ Z≥1 find l(n) ∈ Z≥0 such that there exists a linear system g l(n) n on C but no linear system g l(n)+1 n and classify those linear systems g l(n) n on C. The arguments given by Noether in the answer to this question ...

Eigenfunction Expansions of Ultradifferentiable Functions and Ultradistributions

In this paper we give a global characterisation of classes of ultradifferentiable functions and corresponding ultradistributions on a compact manifold X. The characterisation is given in terms of the eigenfunction expansion of an elliptic operator on X. This extends the result for analytic functions on compact manifold by Seeley [See69], and the characterisation of Gevrey functions and Gevrey u...

On the Microlocal Decomposition of Ultradistributions and Ultradifferentiable Functions

Maximal functions associated to smooth curves.

Let t --> gamma(t), 0 </= t </= 1, be a smooth curve in IR(n). Define the maximal function [unk](f) by [unk](f)(x) = sup(0<h</=1) (1/h) (0) (h) f(x - gamma(t)) dt. We state conditions under which parallel[unk](f) parallel(p) </= A(p) parallelf parallel(p), for 1 < p </= infinity.

On submaximal plane curves

We prove that a submaximal curve in P has sequence of multiplicities (μ, ν, . . . , ν), with μ < sν for every integer s with (s− 1)(s+ 2) ≥ 6.76( r − 1). This note is a sequel to [10], where a specialization method was developed in order to bound the degree of singular plane curves. The problem under consideration is, given a system of multiplicities (m) = (m1,m2, . . . ,mr) ∈ Z and points p1, ...