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By Morris R. Cohen, Ernest Nagel

An creation to common sense and medical process is a school point primer on common sense. This e-book was once commonly utilized by students specially these learning economics as an advent to logical idea in training for highbrow discourse. Ludwig von Mises used to be identified to claim that every one scholars of economics should still learn this e-book as a primary step of their education as economists.

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Usage in everyday conversation in this respect varies. An editorial which sums up the economic situation in the alternative proposi­ tion Either this country will adopt national economic planning, or a revolution cannot be avoided would generally be taken to mean that one, but not both, of the alternatives must be true. On the other hand, when we say Either he is a fool or he is a knave we do not mean to exclude the possibility that both alternatives are true. In the interest of unambiguity, we shall adopt the inter­ pretation according to which the minimum is asserted by such a proposition.

Cancer is preventable is a proposition, though we do not know whether it is true. A difficulty is nevertheless suggested: We may not be able to tell whether a given sentence does or does not express a proposition. Consider, for example, the expression, “Three feet make a yard/' Are we raising questions of truth and falsity in asserting it? It must be acknowledged that the sentence has the appearance of express­ ing a proposition. But if we analyze what is usually meant by it, we find it expresses a resolution rather than something which is capable of being true.

Do we mean to say, however, that both alternants cannot be true? Usage in everyday conversation in this respect varies. An editorial which sums up the economic situation in the alternative proposi­ tion Either this country will adopt national economic planning, or a revolution cannot be avoided would generally be taken to mean that one, but not both, of the alternatives must be true. On the other hand, when we say Either he is a fool or he is a knave we do not mean to exclude the possibility that both alternatives are true.

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