What are the three kinds of sentences that logical positivists thought were the only sentences we should be using?

What are the three kinds of sentences that logical positivists thought were the only sentences we should be using?



1. Protocol sentences: pure statements of observations. 


2. Axioms: theorectical and mathematical terms. 


3. Operational definitions: mixed sentences containing a theorectical term and an observational term to which it was linked


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