Nonassociative mathematics and its applications : fourth Mile High Conference on Nonassociative Mathematics, July 29-August 5, 2017, University of Denver, Denver, Colorado / Petr Vojtěchovský, Murray R. Bremner, J. Scott Carter, Anthony B. Evans, John Huerta, Michael K. Kinyon, G. Eric Moorhouse, Jonathan D.H. Smith, editors. Providence, Rhode Island : American Mathematical Society, 2019 ; © 2019