comprehension schema See SET- THEORETIC PARA -. DOXE. compresence, an unanalyzable relation in terms of which Russell, in his later writings (especially in Human Knowledge: Its Scope and Limits, 1948), took concrete particular objects to be analyzable. Concrete particular objects are analyzable in terms of complexes of qualities all of whose members are compresent. Although this relation can be defined only ostensively, Russell states that it appears in psychology as ‘simultaneity in one experience’ and in physics as ‘overlapping in space-time.’ Complete complexes of compresence are complexes of qualities having the following two properties: (1) all members of the complex are compresent; (2) given anything not a member of the complex, there is at least one member of the complex with which it is not compresent. He argues that there is strong empirical evidence that no two complete complexes have all their qualities in common. Finally, space-time pointinstants are analyzed as complete complexes of compresence. Concrete particulars, on the other hand, are analyzed as series of incomplete complexes of compresence related by certain causal laws. See also BUNDLE THEORY, RUSSEL. A.C.