Institute of Science and Technology Austria, 3400 Klostemeuburg, Austria; °Program for Evolutionary Dynamics, Harvard University, Cambridge, MA
02138; 'Department of Organismic and Evolutionary Biology, Harvard University, Cambridge ... Department of Mathematics, Harvard
University, Cambridge, MA 02138
Edited by Brian Skyrms, University of California, Irvine, CA, and approved October 16, 2018 (received for review June 19, 2018)
Indirect reciprocity