2250 Lecture Notes - Transmodel, Principle Of Bivalence, Logical Biconditional
5 Feb 2013
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Modal sentential logic (many of the exercises and comments in these notes have been drawn from. 11 [belmont, ca: wadsworth, 1997] which is recommended for further study of this topic. I have also consulted john l. bell, david devidi and graham solomon, logical options and j. c. beall and bas c. van fraassen possibilities and paradoxes [oxford: oxford. As far as sl is concerned, we can affirm this sentence, or we can deny (or negate) it. But affirmation and denial are not the only forms that the assertion of a sentence, like fish swim, can take. Here are some examples of what we might call modifications of the simple assertion that fish swim: It is not the case that fish swim. It is necessarily the case that fish swim. It is possibly the case that fish swim. It is contingently the case that fish swim. It ought to be the case that fish swim.
