The recent COSY-11 collaboration measurement of the two-proton correlation
function in the pp -> ppeta reaction, reported at this meeting [1], arouse some
interest in a simple theoretical description of the correlation function. In
these notes we present a pedagogical introduction to the practical methods that
can be used for calculating the correlation function.Comment: Prepared for the proceedings of the Symposium on Meson Physics at
COSY-11 and WASA-at-COSY, Krakow, Poland, 17-22 June 200
