Funding for this research was provided by:
Division of Mathematical Sciences (DMS-1812478)
Swarthmore College (Faculty Research Support Grant)
Article History
Received: 19 October 2018
Revised: 5 December 2018
Accepted: 17 December 2018
First Online: 19 January 2019
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.