Because Without Cause
This chapter investigates non-causal scientific explanations that work by describing how the explanandum involves stronger-than-physical necessity by virtue of certain facts (“constraints”) that possess some variety of necessity stronger than ordinary causal laws possess. In particular, the chapter offers an account of the order of explanatory priority in explanations by constraint. It examines several important examples of explanations by constraint, distinguishing their natural kinds. It gives an account of the sense in which constraints are modally stronger than ordinary causal laws and an account of why certain deductions of constraints exclusively from other constraints possess explanatory power whereas others lack explanatory power.