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

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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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