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1 Aristot.top. 100 b 2-3οὐ δεῖ γὰρ ἐν ταῖς ἐπιστημονικαῖς ἀρχαῖς ἐπιζητεῖσθαι τὸ διὰ τί, exactly expresses Plato's thought and the truth, though Aristotle may have meant it mainly for the principle of non-contradiction and other first principles of logic. Cf. the mediaeval “contra principium negantem non est disputandum.” A teacher of geometry will refuse to discuss the psychology of the idea of space, a teacher of chemistry will not permit the class to ask whether matter is “real.”
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