I see on the one side the totality … down in books. The relations between the concepts … are of a logical nature, and the business … among each other according to firmly laid down … through their connection with sense-experiences. The connection of … of certainty which this relation … can be undertaken, and nothing else, differentiates empty … Although the conceptual systems are logically entirely arbitrary, … co-ordination with the totality of sense- experience; secondly … , i.e., undefined concepts and underived [postulated] propositions.
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