bio  website  web.mat.bham.ac.uk/~barberba 

location  Birmingham, UK  
age  
visits  member for  2 years, 6 months 
seen  11 hours ago  
stats  profile views  626 
Postdoc in Birmingham with Daniela Kühn.
17h

answered  Linear intersection number and vertex covering number 
17h

comment 
Linear intersection number and vertex covering number
This is certainly a dominating set (if you pick one hyperedge containing each hypervertex then every hyperedge meets some hyperedge in the set), but is it a vertex cover? For that you would need that for every intersecting pair of hyperedges, one of the pair is in the cover. Or have I misunderstood? 
2d

reviewed  No Action Needed Finding sparsest solution of a linear system 
2d

reviewed  No Action Needed Schur covering group for S4 
Jan 23 
reviewed  Reviewed IA automorphisms of group of order pq 
Jan 22 
reviewed  Reviewed multivariate closed form solution 
Jan 19 
comment 
Martingales and Bipartite graphs
I suspect that the downvote is because you're asking a lot of closely related questions in a relatively short space of time. Perhaps if you explained what problem you are actually trying to solve we might be better able to suggest appropriate tools for the job. 
Jan 19 
comment 
Martingales and Bipartite graphs
Vertex exposure is going to be better than edge exposure, as changing all of the edges at a vertex is no worse than changing a single edge in terms of the damage it can do to the size of a maximum matching. 
Jan 14 
reviewed  Reviewed Integration of $\int_{\infty}^{\infty}\frac{\cos x}{a^2+x^2}dx$ 
Jan 12 
reviewed  No Action Needed Which properties of a variety are detected by its derived category of coherent sheaves? 
Jan 9 
reviewed  No Action Needed Uniform proof that a finite (irreducible real) reflection group is determined by its degrees? 
Jan 8 
reviewed  No Action Needed Best algorithm/software for solving a planar transportation problem ? 
Jan 8 
revised 
How large must $A$ be if $\{1, \ldots, N\} \subseteq AA$?
tag and rewrite 
Jan 8 
suggested  approved edit on How large must $A$ be if $\{1, \ldots, N\} \subseteq AA$? 
Jan 5 
comment 
covering designs of the form $(v,k,2)$
Together with Daniela Kühn, Allan Lo and Deryk Osthus I have a submitted a paper that proves that statement of Gustavsson and gives quantitative bounds on the value of $\epsilon_H$. The most recent version can be found on the arXiv. arxiv.org/abs/1410.5750 
Dec 18 
reviewed  No Action Needed An optimization problem in complex space 
Dec 17 
reviewed  No Action Needed Is there a natural measures on the space of measurable functions? 
Dec 16 
reviewed  No Action Needed Exotic “nonlinear” (but “almost linear”) automorphisms of symplectic vector space 
Dec 14 
revised 
Endomorphisms and almost all graphs
toplevel tag 
Dec 14 
suggested  approved edit on Endomorphisms and almost all graphs 