with the term concept:

# the concepts (the abstract, ideal notions themselves), and
# the conceptions (the particular instantiations, or realizations of those ideal and abstract notions).

In essence, Hart (1961), Rawls (1971), Dworkin (1972), and Lukes (1974) distinguished between the "unity" of a notion and the "multiplicity" of its possible instantiations. From their work it is easy to understand the issue as one of determining whether there is a single notion that has a number of different instantiations, or whether there

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