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In very general terms, there are Realist and Nominalist versions of each of these. Realism . means only tangible, material things are "real.
In very general terms, there are Realist and Nominalist versions of each of these. Realism ...
a. means only tangible, material things are "real."
b. means there is real, knowable external reality that constrains our choices and behavior.
c. was briefly popular long ago but has no relevance today.
d. is another name for "utilitarianism."