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Galileo proposed what has been called a proto-inertial principle, according to which a body in horizontal motion will conserve its motion. This statement is only true in counterfactual circumstances where no impediments are present. This article analyzes how Galileo could have been justified in ascribing definite properties to this idealized motion. This analysis is then used to better understand the relation of Galileo's proto-inertial principle to the classical inertial principle.

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This chapter examines the arguments van Fraassen gives for constructive empiricism. Van Fraassen is often presented as giving some version of the argument from underdetermination: the argument which holds that since theories always have empirically equivalent rivals, empirical evidence can never adjudicate between a theory and its rivals, and hence belief in any theory is unfounded. It is argued that van Fraassen does not give any version of the argument from underdetermination, and that the argument from underdetermination is incompatible with van Fraassen's epistemological views.