Funding for this research was provided by:
Engineering and Physical Sciences Research Council (EP/M508160/1, EP/N023781/1, EP/P021123/1)
Institute of Mathematics and its Applications (Small Grant Scheme)
Leverhulme Trust (2014-112)
Directorate for Mathematical and Physical Sciences (DMS-1440140)
Division of Mathematical Sciences (DMS-1440140)
London Mathematical Society (31633)
Alexander von Humboldt-Stiftung (Humboldt Research Fellowship for Experienced Researchers)
Article History
Received: 26 December 2018
Accepted: 8 April 2019
First Online: 7 May 2019