\documentclass[oneside,final,12pt]{book}

\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{xunicode}

\usepackage{hyperref}
\usepackage{xstring}
\def\rooturl{https://www.math.bgu.ac.il/}
\hyperbaseurl{\rooturl}
\let\hhref\href
\providecommand{\extrahref}[2][]{\LTRfootnote{\LR{\IfBeginWith*{#2}{http}{\nolinkurl{#2}}{\nolinkurl{\rooturl#2}}}}}
\renewcommand{\href}[2]{\IfBeginWith*{#1}{http}{\hhref{#1}{#2}}{\hhref{\rooturl#1}{#2}}\extrahref{#1}}

\usepackage{polyglossia}
\usepackage{longtable}
%% even in English, we sometimes have Hebrew (as in course hours), and we
%% can't add it in :preamble, since it comes after hyperref
%%\usepackage{bidi}
\setdefaultlanguage{english}
\setotherlanguage{hebrew}
%%\setmainfont[Ligatures=TeX]{Libertinus Serif}
\setmainfont[Script=Hebrew,Ligatures=TeX]{LibertinusSerif}[
  UprightFont = *-Regular,
  BoldFont = *-Bold,
  ItalicFont = *-Italic,
  BoldItalicFont = *-BoldItalic,
  Extension = .otf]

\SepMark{‭.}
\robustify\hebrewnumeral
\robustify\Hebrewnumeral
\robustify\Hebrewnumeralfinal

% vim: ft=eruby.tex:



\begin{document}
\pagestyle{empty}
\pagenumbering{gobble}

\begin{center}
\vspace*{\baselineskip}

{\Large Department of Mathematics, BGU}

\vspace*{\baselineskip}

\rule{\textwidth}{1.6pt}\vspace*{-\baselineskip}\vspace*{2pt}
\rule{\textwidth}{0.4pt}\\[\baselineskip]

{\Huge Operator Algebras Seminar}\\[0.2\baselineskip]

\rule{\textwidth}{0.4pt}\vspace*{-\baselineskip}\vspace{3.2pt}
\rule{\textwidth}{1.6pt}\\[\baselineskip]

\textbf{On} \emph{Wednesday, December 24, 2025}
\bigskip

\textbf{At} \emph{13:00 -- 14:00}
\bigskip

\textbf{In} \emph{201}

\vspace*{2\baselineskip}

{\large\scshape James Pascoe 
  %
  (Drexel U)
}
\bigskip

will talk about
\bigskip

{\Large\bfseries Constrained sphere packing and the interpolation problem for positive definite functions\par}
\bigskip

\end{center}
\vfill

\textsc{Abstract:}
Delsarte's method provides a framework for analysis of sphere packing
problems in terms of positive definite functions. Constrained packing,
where only a prespecified set of angles between points may occur, is,
in turn, naturally governed by the interpolation theory for positive
definite functions. In this talk, we discuss the general theory of
positive definite functions on the sphere, Delsarte's method and its
geometric kernel embedding interpretation, related interpolation
problems, and other topics.

Based on joining work with Sujit Sakharam Damase.








% vim: ft=eruby.tex:


\end{document}

% vim: ft=eruby.tex:
