By Morris R. Cohen, Ernest Nagel
An advent to common sense and medical strategy is a school point primer on common sense. This publication used to be greatly utilized by students specially these learning economics as an creation to logical idea in guidance for highbrow discourse. Ludwig von Mises was once recognized to assert that every one scholars of economics should still learn this booklet as a primary step of their education as economists.
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Extra info for An Introduction to Logic and Scientific Method
Similarly, our apprehension of the logical impli cation on which our inferences are based may be studied as a psy chological event, but the relation directly apprehended is not itself a psychological event at all. It is a relation between the forms of propositions and indirectly one between the classes of possible ob jects asserted by them. The realization that logic cannot be restricted to psychological phenomena will help us to discriminate between our science and rhetoric—conceiving the latter as the art of persuasion or of ar guing so as to produce the feeling of certainty.
We do not intend to assert the truth or falsity of any of the alternants: we do not say that All men are selfish nor that All men are ignorant of their own interests. All that we do assert is that at least one of the alternants is 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.
Some pagans are not foolish is a particular negative, and is symbolized by O. The letters A and I have been used traditionally for affirmative propositions: they are the first two vowels in affirmo; while E and O symbolize negative propositions: they are the vowels in nego. Exclusive and Exceptive Propositions In the propositions The wicked alone are happy, Only the lazy are poor, None hut savages are healthy, something is predicated of something else in an exclusive fashion. They are therefore called exclusive propositions.
An Introduction to Logic and Scientific Method by Morris R. Cohen, Ernest Nagel