 Rejecting the Aristotelian notion of “partial possibility” on which most conceptions of possibility are based, Hartmann embraces a “Megarian” conception of “real possibility.” Hartmann examines the differences between “real possibility” and “essential [or ideal] possibility,” “real necessity” and “essential [or ideal] necessity,” among others, and argues that paradoxically the possible, the actual, and the necessary coincide in the real world (Hartmann 2017 [1937]; PA16b-c). In other words, the real world is fully determinate, and whatever is possible is possible within the bounds of the actual world. (Peruzzi 2001 considers the relation between Hartmann’s view of modality and “possible worlds” semantics.)