reductio ad absurdumとは 意味・読み方・使い方
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reductio ad absurdum
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a method of proving a proposition, called reductio ad absurdum発音を聞く 例文帳に追加
背理法という,命題の証明法 - EDR日英対訳辞書
--a quick reductio ad absurdum shows that to make a ban on links effective, they would also have to ban the mere mention of foreign Universal Resource Locators.発音を聞く 例文帳に追加
——ちょっと「極論にまで誇張」reductio ad absurdum 式の思考実験をしてみれば、リンク禁止が実質的に意味を持つためには、外国の Universal Resource Locatorsを表示すること自体を禁止しなくてはならないことがわかる。 - Electronic Frontier Foundation『DESのクラック:暗号研究と盗聴政策、チップ設計の秘密』
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Wiktionary英語版での「reductio ad absurdum」の意味 |
reductio ad absurdum
語源
名詞
reductio ad absurdum (usually uncountable, 複数形 reductio ad absurdums)
- (mathematics, logic) The method of disproving a statement by assuming the statement is true and, with that assumption, arriving at a blatant contradiction.
- 1894, Flora Helm, “Concerns a Talk in Which Anarchy and Love Are Blended”, in Between Two Forces: A Record of a Theory and a Passion, Boston, Mass.: Arena Publishing Company. […], pages 149–150:
- “You, gentlemen, as representatives of that institution which recognizes only truths that are deduced from reductio ad absurdums will probably have no difficulty in perceiving the truth of this absurdity and hence be ready to excuse the outcome of it—my absence.”
- 1998, Mark H. Bickhard, “Constructivisms and Relativisms: A Shopper’s Guide”, in Michael R[obert] Matthews, editor, Constructivism in Science Education: A Philosophical Examination, Dordrecht; Boston, Mass.; London: Kluwer Academic Publishers, →ISBN, page 106:
- Constructing representations out of atoms that are already themselves representations cannot address the origins of the atoms per se. Careful pursuit of such approaches has yielded bizarre reductio ad absurdums such as the implication that virtually all concepts that human beings are capable of having are already in the genes.
- 2009, Michael S. Moore, “Normative Problems in Applying the Harm-within-the-Risk Test to Crimes/Torts of Negligence”, in Causation and Responsibility: An Essay in Law, Morals, and Metaphysics, Oxford University Press, published 2010, →ISBN, section III (The First Blind Alley: The Attempt to Replace Proximate Causation with Culpability as a Prerequisite for Legal Liability), page 208:
- One way to argue against a position is to demonstrate that it proves too much. Proponents of an HWR analysis of negligence may insist that the conceptual and normative arguments that have been directed against their project ultimately generate reductio ad absurdums suggesting that I have proved too much.
語源
Possibly a loose calque of Ancient Greek ἡ εἰς τὸ ἀδύνατον ἀπόδειξις (hē eis tò adúnaton apódeixis, “demonstration towards the impossible”).
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