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Conditions for the evolution of monogamy when pathogen causes sterility. The invasion coefficient is the left-hand side of (3.1); when it is positive, the mutant can invade. The solution of 
provides (a) the 
and (b) the δ*. (b) The δc used is provided in (2.2). Curves in panels (a) and (b) correspond to different values of 
: as the curves are translated downwards, catalysis costs (magnitude of 
) increase.
