48 citations · 71 across the 7 of their papers we have counts for
8 papers
The Gannon Storm: Citizen science observations during the geomagnetic superstorm of 10 May 2024
Maxime Grandin, Emma Bruus, Vincent E. Ledvina +12
The 10 May 2024 geomagnetic storm, referred to as the Gannon Storm in this paper, was one of the most extreme to have occurred in over 20 years. In the era of smartphones and socia…
A Characterization of Quasi-homogeneous Bivariate Polynomials
David Bradley-Williams, Pablo Cubides Kovacsics, Immanuel Halupczok
If a reduced bivariate polynomial is quasi-homogeneous, then its discriminant is a monomial. Over fields of characteristic , we show that if one adds another simple condition, t…
EPPA numbers of graphs
David Bradley-Williams, Peter J. Cameron, Jan Hubička +1
If is a graph, and its induced subgraphs, and an isomorphism, we say that is a \emph{partial automorphism} of . In 1992, Hrushovski proved that…
Riso-stratifications and a tree invariant
David Bradley-Williams, Immanuel Halupczok
We introduce a new notion of stratification (``riso-stratification''), which is canonical and which exists in a variety of settings, including different topological fields like $\m…
Spherically complete models of Hensel minimal valued fields
David Bradley-Williams, Immanuel Halupczok
We prove that Hensel minimal expansions of finitely ramified Henselian valued fields admit spherically complete immediate elementary extensions. More precisely, the version of Hens…
On limits of betweenness relations
David Bradley-Williams, John K Truss
We give a flexible method for constructing a wide variety of limits of betweenness relations. This unifies work of Adeleke, who constructed a Jordan group preserving a limit of bet…
Ramsey expansions of metrically homogeneous graphs
Andrés Aranda, David Bradley-Williams, Jan Hubička +4
We investigate Ramsey expansions, the coherent extension property for partial isometries (EPPA), and the existence of a stationary independence relation for all classes of metrical…
The universal homogeneous binary tree
Manuel Bodirsky, David Bradley-Williams, Michael Pinsker +1
A partial order is called semilinear iff the upper bounds of each element are linearly ordered and any two elements have a common upper bound. There exists, up to isomorphism, a un…