P. Lipparini

activity

20052012

most citedCombinatorial and model-theoretical principles related to regularity of ultrafilters and compactness of topological spaces. III

3 citations · 7 across the 17 of their papers we have counts for

collaborators

Showing 2006Show all

4 papers · 1 filter

math.RA2006

Towards Commutator theory for relations. IV

Paolo Lipparini

We provide more characterizations of varieties having a term Mal'cev modulo two functions $F$ and $G$ . We characterize varieties neutral in the sense of $F$ , that is varieties sati…

math.GM2006

On tolerances representable as $R \circ R^{-}$

Paolo Lipparini

We give examples and counterexamples concerning varieties in which every tolerance is representable as $R \circ R^{-}$ , for some reflexive and admissible relation $R$ .

math.LO2006

A connection between decomposable ultrafilters and possible cofinalities. II

Paolo Lipparini

We use Shelah's theory of possible cofinalities in order to solve a problem about ultrafilters. THEOREM. Suppose that $λ$ is a singular cardinal, $λ^{'} < λ$ , and the ultrafilter $D…

math.LO2006★ 1 cited

A connection between decomposability of ultrafilters and possible cofinalities

Paolo Lipparini

We introduce the decomposability spectrum $K_{D} = {λ \geq ω ∣ D is λ -decomposable}$ of an ultrafilter $D$ , and show that Shelah's $\pcf$ theory influences the possible v…

Towards Commutator theory for relations. IV

On tolerances representable as R∘R−

A connection between decomposable ultrafilters and possible cofinalities. II

A connection between decomposability of ultrafilters and possible cofinalities

On tolerances representable as $R \circ R^{-}$