Sentence:  Aristotle does, indeed, distinguish between (1) Logic, or Analytic, as the theory or method of arriving at true or <WSD>apodeictic</WSD> conclusions; and (2) Dialectic as the method of arriving at conclusions that are accepted or pass current[ly] as true,... 
Meaning of the word marked with <WSD> tags:  Of the characteristic feature of a proposition that is necessary (or impossible): perfectly certain (or inconceivable) or incontrovertibly true (or false); self-evident.