The Nature of Logic
Reasoning is for the most part carried on by the aid of signs. It has been contended by some writers that it can only be conducted by this agency; others maintain that the use of signs is not indispensable and this is the more probable opinion. But it is universally agreed that the use of signs is a most important aid and that without them no extended process or reasoning could be conducted
KeywordsMental Operation Subject Class Numerical Magnitude Pear Tree Direct Operation
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