|Abstract: non-representational - abstract concept, expression of something non-objective - how to demarcate from concrete objects? How to differentiate between abstract entities and concepts, ultimately words.|
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abstract entities / ontology / ontological commitment / Field: E.g. when I say there are only finitely many grains of sand, I need just to accept as little abstract entities, as when I say, there are less than 87 grains of sand - ... + ... - solution / Field: "abstract counterparts" (see above): Function as an abstract counterpart to the assertion that "there are at least 87".
Realism, Mathematics and Modality Oxford New York 1989
Truth and the Absence of Fact Oxford New York 2001
Science without numbers Princeton New Jersey 1980