The first chapter discusses the association of the English word ‘or’ in reasoning. “Or” is descended from the Anglo-Saxon word meaning second, a form which survives in such expressions as “every other day.” If logical theory had not introduced the vocabulary of disjunction, we could not formulate the question. The truth-functional character of ‘or’ and ‘and’, if they have such a character in their natural language habitat, is a character that is derived as a consequence of their playing a certain role in discourse, one best described as punctuation, or in a specialized sense of the word adverbial. In many cases, the transformation of a sentence embedding an or-list to an equivalent or joined pair of sentences cannot plausibly be called disjunctive distribution. ‘Or’-words derive from additive rather than from subtractive ancestors.
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