7 citations · 28 across the 19 of their papers we have counts for
22 papers
Lifting braids over and non-orientable Lefschetz fibrations
Valentina Bais, Porter Morgan, Daniele Zuddas
We show that, given a closed connected non-orientable surface and a simple branched cover of degree , every self-diffeomorphism…
Branched coverings of simply connected -manifolds
Valentina Bais, Riccardo Piergallini, Daniele Zuddas
We show that, given and two closed connected oriented PL -manifolds and such that has a handle decomposition with no - and -handles, there exists a…
Branched covering representation of non-orientable -manifolds
Valentina Bais, Riccardo Piergallini, Daniele Zuddas
We show that every closed connected non-orientable PL -manifold is a simple branched covering of $\RP^4$. We also show that is a simple branched covering of the twisted…
Some examples of small irreducible exotic 4-manifolds with free abelian fundamental group
Valentina Bais, Rafael Torres, Daniele Zuddas
We produce examples of pairwise non-diffeomorphic closed irreducible 4-manifolds with non-trivial free abelian fundamental group of rank less than three and small Euler characteris…
On smooth functions with two critical values
Antonio Lerario, Chiara Meroni, Daniele Zuddas
We prove that every smooth closed manifold admits a smooth real-valued function with only two critical values. We call a function of this type a \emph{Reeb function}. We prove that…
On Stiefel's parallelizability of 3-manifolds
Valentina Bais, Daniele Zuddas
We give a new elementary proof of the parallelizability of closed orientable 3-manifolds. We use as the main tool the fact that any such manifold admits a Heegaard splitting.
An Evolutionary Approach to Adapt Tests Across Mobile Apps
Leonardo Mariani, Mauro Pezzè, Valerio Terragni +1
Automatic generators of GUI tests often fail to generate semantically relevant test cases, and thus miss important test scenarios. To address this issue, test adaptation techniques…
Branched covering simply-connected 4-manifolds
David Auckly, R. Inanc Baykur, Roger Casals +3
We prove that any closed simply-connected smooth 4-manifold is 16-fold branched covered by a product of an orientable surface with the 2-torus, where the construction is natural wi…
On the strongly pseudoconcave boundary of a compact complex surface
Naohiko Kasuya, Daniele Zuddas
We establish the method of holomorphic handle attaching to the strongly pseudoconcave boundary of a complex surface. We use this for proving the following statements: (1) every clo…
Certifying a compact topological 4-manifold
Michael Freedman, Daniele Zuddas
We prove that compact topological 4-manifolds can be effectively presented by a finite amount of data.
Special moves for open book decompositions of 3-manifolds
Riccardo Piergallini, Daniele Zuddas
We provide a complete set of two moves that suffice to relate any two open book decompositions of a given 3-manifold. One of the moves is the usual plumbing with a positive or nega…
A concave holomorphic filling of an overtwisted contact -sphere
Naohiko Kasuya, Daniele Zuddas
In this paper we prove that the closed -ball admits non-Kähler complex structures with strictly pseudoconcave boundary. Moreover, the induced contact structure on the boundary $…
Branched coverings of and other basic 4-manifolds
Riccardo Piergallini, Daniele Zuddas
We give necessary and sufficient conditions for a 4-manifold to be a branched covering of , , and , which are…
On codimension-1 submanifolds of the real and complex projective space
Beniamino Cappelletti Montano, Andrea Loi, Daniele Zuddas
Inspired by the analogous result in the algebraic setting (Theorem 1) we show (Theorem 2) that the product of a closed and orientable topological manifold…
On branched covering representation of 4-manifolds
Riccardo Piergallini, Daniele Zuddas
We provide new branched covering representations for bounded and/or non-compact 4-manifolds, which extend the known ones for closed 4-manifolds. Assuming to be a connected orie…
Non-Kähler complex structures on
Antonio J. Di Scala, Naohiko Kasuya, Daniele Zuddas
We construct the first examples of non-Kähler complex structures on . These complex surfaces have some analogies with the complex structures constructed in early Fifties by Ca…
On embeddings of almost complex manifolds in almost complex Euclidean spaces
Antonio J. Di Scala, Naohiko Kasuya, Daniele Zuddas
We prove that any compact almost complex manifold of real dimension admits a pseudo-holomorphic embedding in a Euclidean space of dimension , endowed with a s…
Universal Lefschetz fibrations and Lefschetz cobordisms
Daniele Zuddas
We construct universal Lefschetz fibrations, defined in analogy with classical universal bundles. We also introduce the cobordism groups of Lefschetz fibrations, and we see how the…
Universal Lefschetz fibrations over bounded surfaces
Daniele Zuddas
In analogy with the vector bundle theory we define universal and strongly universal Lefschetz fibrations over bounded surfaces. After giving a characterization of these fibrations…
Lefschetz fibrations over the disc
Nikos Apostolakis, Riccardo Piergallini, Daniele Zuddas
We provide a complete set of moves relating any two Lefschetz fibrations over the disk having as their total space the same 4-dimensional 2-handlebody up to 2-equivalence. As a con…
Embedding almost-complex manifolds in almost-complex Euclidean spaces
Antonio J. Di Scala, Daniele Zuddas
We show that any compact almost-complex manifold of complex dimension m can be pseudo-holomorphically embedded in R^(6m) equipped with a suitable almost-complex structure.
Representing Dehn twists with branched coverings
Daniele Zuddas
We show that any homologically non-trivial Dehn twist of a compact surface F with boundary is the lifting of a half-twist in the braid group B_n, with respect to a suitable branche…