To a modern logician, a mathematical structure is precisely this: a set of abstract entities with relations between them. (discovermagazine.com)
Hence, within the context of the metaphysical theory of the objective idealism, as elaborated in «Realism and Idealism,» the term «a priori» receives a different meaning: a priori ideas function as abstract entities, as potentialities that are gradually actualized in the evolving reality. (religion-online.org)
The Church must be an authentic partner in a dialogue, independent of the opinion of an individual theologian; but this she can be only if she is not a formal and abstract entity capable of being changed by individual thought into just anything. (religion-online.org)