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τεκμήρια] ‘Certain, necessary, signs, and enthymemes of that sort (founded upon them), will not be found capable of refutation in respect of their not being reducible to the syllogistic form—which is plain to us from the Analytics (An. Pr. II 27), and it only remains to shew that the fact alleged is false (or non-existent). But if it be clear both that the fact stated is true, and that it is a necessary sign, then indeed it does become absolutely insoluble. For by demonstration (the τεκμήριον converted into a syllogism) everything is made quite clear’; when once a thing is demonstrated, the truth of it becomes clear and indisputable. On the τεκμήριον,. I 2. 16, 17, 18, μόνον γὰρ ἂν ἀληθὲς ᾖ ἄλυτόν ἐστιν.
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