|Property: what can be ascribed to an object in order to distinguish it from other objects. In philosophy, there is debate about whether properties exist or whether "bare particulars" exist. Expressions for properties are predicates. Not every predicate will refer to a property. See also quantification over properties, 2nd order logic, HOL, completeness.|
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Features / Field: we need to reduce them! Instead: predicates - predicates do not imply use of quantification over properties -
Properties / propositions / Field: Example two predicates like "x has a temperature of 210" and "x has a average molecular energy ..." can stand for the same property, although they have different meanings. - properties are quite different from meanings (propositions).
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