The name for Kojman–Shelah collapsing function Original Research Article

In the previous paper of this volume, Kojman and Shelah solved our long standing problem of collapsing cardinal View the MathML source to View the MathML source by the forcing ([κ]κ,⊆) for singular κ with countable cofinality. The aim of the present paper is to give an explicit construction of the Boolean matrix for this collapse.