1,614 reputation
1616
bio website web.mat.bham.ac.uk/~barberba
location Birmingham, UK
age
visits member for 2 years, 6 months
seen 11 hours ago

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 multi-variate 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 $\{1, \ldots, N\} \subseteq A-A$?
tag and rewrite
Jan
8
suggested approved edit on How large must $A$ be if $\{1, \ldots, N\} \subseteq A-A$?
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 “non-linear” (but “almost linear”) automorphisms of symplectic vector space
Dec
14
revised Endomorphisms and almost all graphs
top-level tag
Dec
14
suggested approved edit on Endomorphisms and almost all graphs