Connective fiberings over $BU$ and $U$

Surface Bundles over Surfaces with Arbitrarily Many Fiberings

In this paper we give the first example of a surface bundle over a surface with at least three fiberings. In fact, for each n ≥ 3 we construct 4-manifolds E admitting at least n distinct fiberings pi : E → Σgi as a surface bundle over a surface with base and fiber both closed surfaces of negative Euler characteristic. We give examples of surface bundles admitting multiple fiberings for which th...

On the U-WPF Acts over Monoids

Valdis Laan in [5] introduced an extension of strong flatness which is called weak pullback flatness. In this paper we introduce a new property of acts over monoids, called U-WPF which is an extension of weak pullback flatness and give a classification of monoids by this property of their acts and also a classification of monoids when this property of acts implies others. We also show that regu...

1 The BU . P . U . S Team Team Mentor

The BU . P . U . S Team Team Mentor

On the Factors and Fiberings of Manifolds