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[27] The school of Theodorus, as I have said, groups everything under heads, by which they mean several things. First they mean the main question, which is to be identified with the basis; secondly they mean the other questions dependent on the main question, thirdly the proposition and the statement of the proofs. The word is used as we use it when we say “It is the head of the whole business,” or, as Menander says, κεφάλαιόν ἐστιν.1 But generally speaking, anything which has to be proved will be a head of varying degrees of importance. [p. 537]

I have now set forth the principles laid down by the writers of text-books,

1 Perhaps a gloss referring to the late rhetorician Menander. If genuine, the words must refer to the comic poet.

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