Title: A maximal Boolean sublattice that is not the range of a Banaschewski function,
Abstract: We construct a countable bounded sublattice of the lattice of all subspaces
of a vector space with two non-isomorphic maximal Boolean sublattice. We
represent one of them as the range of a Banschewski function and we prove that
this is not the case of the other. Hereby we solve a problem of F. Wehrung.